The Canadian Naturalist and Geologist, Том 5Dawson., 1860 |
Результаты поиска по книге
Результаты 1 – 5 из 38
Стр. 61
... glabella is broad in front , narrowed behind and covered with small but prominent rounded tubercles about or of a line in diameter and of which there are from 10 to 15 in an area of one line square . The anterior lobe of the glabella is ...
... glabella is broad in front , narrowed behind and covered with small but prominent rounded tubercles about or of a line in diameter and of which there are from 10 to 15 in an area of one line square . The anterior lobe of the glabella is ...
Стр. 62
... glabella and the neck segment rather prominent . The eyes as partly exhibited in one of the specimens are rather small , their diameter being one line or perhaps rather more . They appear to be distant a little more than their own ...
... glabella and the neck segment rather prominent . The eyes as partly exhibited in one of the specimens are rather small , their diameter being one line or perhaps rather more . They appear to be distant a little more than their own ...
Стр. 63
... glabella equal to the whole length of the head , moderately convex in front , the anterior lobe transversely oval , twice the width of the neck - segment , not ... glabella . The sides of the glabella are. Silurian Fossils of Canada . 63.
... glabella equal to the whole length of the head , moderately convex in front , the anterior lobe transversely oval , twice the width of the neck - segment , not ... glabella . The sides of the glabella are. Silurian Fossils of Canada . 63.
Стр. 64
across the glabella . The sides of the glabella are curved a little inward at the posterior lobes and then outwards to the outer extremities of the anterior furrows . The neck segment is large and has its posterior margin rather ...
across the glabella . The sides of the glabella are curved a little inward at the posterior lobes and then outwards to the outer extremities of the anterior furrows . The neck segment is large and has its posterior margin rather ...
Стр. 65
... glabella . The neck segment is strongly elevated , connected with the main body of the glabella by a narrow convex neck - like ridge with a small rounded tubercle on each side . All of the glabellar furrows are but slightly impressed ...
... glabella . The neck segment is strongly elevated , connected with the main body of the glabella by a narrow convex neck - like ridge with a small rounded tubercle on each side . All of the glabellar furrows are but slightly impressed ...
Другие издания - Просмотреть все
Часто встречающиеся слова и выражения
abundant alæ angle animals aperture appears Arisaig August beak beds Bevin's Lake Boisd Canada Canadian carboniferous cinereous coal collection common convex curved deposits Devonian diameter Dikelocephalus distance distinct Distribution.-New York dorsal Doubleday Eastern Townships elevated end of Lake feet Forewings Fort Vancouver fossils Gaspé Genus geological glabella Gosse Guén half Hamilton's Farm Harris head inches Indian July June Kirby Lake Winnipeg larvæ Lawrence length limestone lines lobes miles Montcalm Montreal mountain Murray Bay Natural History Naturalist nearly neck furrow neck segment North end Nova Scotia obliquely observed Orillia plants posterior pygidium resembles ridge River River Rouge rocks Rouge District rounded sandstone seam seen septa shale shell side Silurian siphuncle slightly Society Sorel species specimens striæ Sugar-bush Lake thickness tion transverse trees umbilicus upper ventral valve Walker whorl width wings woods
Популярные отрывки
Стр. 458 - THE GLACIERS OF THE ALPS : being a Narrative of Excursions and Ascents. An Account of the Origin and Phenomena of Glaciers, and an Exposition of the Physical Principles to which they are related.
Стр. 119 - Analogy would lead me one step further, namely, to the belief that all animals and plants have descended from some one prototype. But analogy may be a deceitful guide. Nevertheless all living things have much in common, in their chemical composition, their germinal vesicles, their cellular structure, and their laws of growth and reproduction. We see this even in so trifling a circumstance as that the same poison often similarly affects plants and animals ; or that the poison secreted by the gall-fly...
Стр. 119 - I cannot doubt that the theory of descent with modification embraces all the members of the same great class or kingdom. I believe that animals are descended from at most only four or five progenitors, and plants from an equal or lesser number.
Стр. 71 - ... caves have been inhabited by a succession of tenants, and have been selected by man as a place not only of domicile, but of sepulture, while some caves have also served as the channels through which the waters of...
Стр. 118 - It may be asked how far I extend the doctrine of the modification of species. The question is difficult to answer, because the more distinct the forms are which we consider, by so much the arguments in favour of community of descent become fewer in number and less in force. But some arguments of the greatest weight extend very far. All...
Стр. 70 - No subject has lately excited more curiosity and general interest among geologists and the public than the question of the antiquity of the human race ; whether or no we have sufficient evidence to prove the former co-existence of man with certain extinct mammalia, in caves or in the superficial deposits commonly called drift or
Стр. 403 - Without asserting that every part of the theory had been confirmed, he maintained that it was the best explanation of the origin of species which had yet been offered. With regard to the psychological distinction between man and animals; man himself was once a monad — a mere atom, and nobody could say at what moment in the history of his development he became consciously intelligent.
Стр. 74 - ... races and permanent varieties in animals and plants, are the same as those which, in much longer periods, produce species, and, in a still longer series of ages, give rise to differences of generic rank. He appears to me to have succeeded, by his investigations and reasonings...
Стр. 47 - Makrede and one or two others, all belonging either to the genus Bagrus or one nearly allied to it. The first two are quite common in the market and I have seen many specimens of them ; for the last two I have the authority of negro fishermen but have never seen them myself. The eggs in my collection are of three different sizes, indicating so many species ; one of the three having been brought to me without the fish from which they were taken. The eggs become quite large before they leave the ovaries,...
Стр. 181 - ... simply because it was so probable that the operation would be followed by a fatal issue, that I wished to prepare for death and what lies beyond it, whilst my faculties were clear and my emotions were comparatively undisturbed, for I knew well that if the operation were speedily followed by death, I should be in a condition, during the interval, in the last degree unfavourable to making preparation for the great change.