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Waldheimia septigera and Terebratella septata, identical.— TO THE EDITOR OF THE AMERICAN NATURALIST.-Sir,-Having in the course of a too short visit to North America been honored by remarkable kindness and attention on the part of my brother naturalists in this great hemisphere, I am rather disappointed at seeing in your excellent periodical a notice of the Report submitted to the Royal Society of London by my colleagues and myself, on the deep-sea exploration of parts of the North Atlantic, in H. M. S. "Porcupine," during the summer of 1869. The writer of that notice, Mr. W. H. Dall, criticises in what I cannot help considering over severe terms my views "in regard of the specific and generic limits of animals; " and he gives as an instance," Waldheimia septigera" and "Terebratella septata,” which he states belong to different genera, although I have included both under the same specific name. I do not agree with Mr. Dall in his statement. Having had opportunities of examining the types or original specimens of Terebratula septigera (Lovén) at Stockholm, and of Terebratula septata (Philippi) at Berlin, and having carefully compared these specimens with the published descriptions and figures, I am convinced that both be long not only to the same genus but to the same species. What seems to have been in the mind of Mr. Dall when he penned his hasty critique was that Professor Seguenza of Messina had referred a species of Terebratella from the Sicilian tertiaries to Philippi's species and a species of Terebratula found in the same formation to Lovén's species. The former may be the Terebratella Maria of Mr. Arthur Adams from the Japanese seas; the latter I have ascertained to be rather widely distributed in the North Atlantic.

I have the honour to be, Sir,
Your very obedient servant,

Montreal, 6th October, 1871.

Püblished April, 1872.

J. GWYN JEFFREYS.

Pl.VII. Critical and Rare Post-pliocene Species. ( Canadian Naturalist.]

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