Bindicates FIG. 197. CHAPTER III SYSTEMATIC ARRANGEMENT OF REPRESENTATIVE FORMS SERIES I., PROTOZOA. — Animals without cellular tissues or true eggs. CLASS I. Rhizopoda. Having the power of throwing out pseudopodia. Order 1. LOBOSA: - With short, blunt pseudopodia: Amaba. Order 4. RADIOLARIA. Order 2. FORAMINIFERA. With fine, anastomosing pseudopodia and calcareous shell; (single: Lagena. Order 3. HELIOZOA. With fine, stiff, radiating pseudopodia: Actinophrys. compound: Nummulites. With siliceous shell: Podocyrtis. stage: Trichia. CLASS II. Mycetozoa. - Terrestrial Protozoa, forming large amoeboid plasmodia and having plantlike spore CLASS III. Mastigophora. Having one flagellum or more, as the organ of motion: Euglena. CLASS IV. Sporozoa. Consisting of one cell, and parasitic Gregarina. CLASS V. Infusoria. — Having cuticle, mouth, and cilia or tentacles. Order 1. CILIATA. - Bearing vibratile cilia ; fixed: Vorticella. free: Paramecium. Order 2. TENTACULIFERA. With suctorial tentacles: Acineta. SERIES II., METAZOA. — Animals with cellular tissues, true eggs, and blastoderm. Branch II. PORIFERA. - Metazoa, with numerous incurrent openings, one or few excurrent orifices, generally a skeleton, independent cells. Skeleton, if present, of spongin fibers (Euspongia), or of siliceous spicules (Euplectella). Subclass 2. NON-CALCAREA. Branch III. COELENTERATA. - Radiate Metazoa, body consisting of two cell layers, with distinct digestive cavity, tentacles, and nettling thread cells. CLASS I. Hydrozoa. - Single digestive cavity, with which the mouth communicates freely. Order 1. LEPTOLINE. Fixed by adherent disk; single: Hydra. compound: Eucope. Order 2. HYDROCORALLINA. - With a skeleton of lime, forming a coral: Millepora. Order 1. STAUROMEDUSE.-Cup-shaped, with marginal tufts of tentacles, and eight or more radiating canals; attached; single: Lucer naria. Order 2. DISCOMEDUSA. - Free and oceanic; disk-shaped, with marginal fringe of tentacles and " veil"; four canals; single: Aurelia. CLASS III. Actinozoa. - Double digestive cavity, with radiating septa. Order 1. ACTINIARIA. — Parts in some multiple of five or six; soft-bodied; single; slightly locomotive: Actinia. sclerodermic, rough, calcareous coral: Madrepora. sclerobasic, smooth coral: Astræa. Order 2. MADREPORARIA. — Parts in some multiple of five or six; composite; fixed; secreting soft-bodied: Alcyonium. Order 3. ALCYONACEA. Eight parts; composite; fixed; Order 4. secreting furrowed sclerobasic coral: Corallium. GORGONACEA.-Tree-like, spicules present in mesogloa: Gorgonia. Order 5. PENNATULACEA. - Elongated colony with horny or calcareous AXIS: Pennatula. CLASS IV. Ctenophora. - Soft-bodied; transparent; free, moving by eight rows of tiny paddles; two tentacles; diges tive cavity with anal outlet: Pleurobrachia. Branch IV. PLATYHELMINTHES. - Body generally flattened, no true metameric segmentation, no body cavity nor blood-vascular system. CLASS I. Turbellaria. - Nonparasitic, with ciliated epidermis; digestive cavity present: Planaria. CLASS II. Cestoda. - Parasitic within the host; without cilia or digestive cavity: Tania. Branch V. NEMATHELMINTHES. - Body cylindrical, pointed at each end, cuticle tough, body cavity present. CLASS I. Nematoda. - Characters of the branch: Trichina. Branch VI. TROCHELMINTHES.- Microscopic but multicellular, with body cavity, digestive and nervous systems, body bearing cilia in rings or scattered over the surface. CLASS I. Rotifera. - Cilia on a retractile disk at anterior end: Brachionus. Branch VII. MOLLUSCOIDA. — Having a lophophore or tentacle bearing ridge at anterior end of body. CLASS I. Polyzoa. - Forming colonies, minute, fixed: Flustra. CLASS II. Brachiopoda. — Body inclosed in two-valved shell; no gills; two ciliated arms; fixed; marine: Terebratula. CLASS II. Ophiuroidea. - Body star-shaped; free; mouth underneath; moving by long slender arms: Ophiura. CLASS III. Echinoidea. — Body inclosed in a spinous shell; free, moving by suckers; mouth spherical: Arbacia. underneath, with five teeth; flat: Clypeaster. CLASS IV. Holothuroidea. - Body cylindrical and soft; free, moving by suckers; mouth in front, surrounded by tentacles: Pentacta. CLASS V. Crinoidea. — Body cup-shaped; mouth uppermost: Pentacrinus. Branch IX. ANNULATA. - Soft body generally divided externally into a number of rings; no jointed appendages. CLASS I. Chatopoda. -Body round, segments numerous, similar, and ( bristles numerous: Nereis. bearing horny bristles; CLASS II. Hirudinea. - Body flat, with suckers at ends: Hirudo. bristles few on each segment: Lumbricus. Branch X. ARTHROPODA. Metazoa, usually with definite number of segments and jointed appendages. CLASS § 1. Water-breathing. I. Crustacea. Having gills and more than eight jointed legs; four antenn Order 1. PHYLLOPODA. antennæ. Order 2. OSTRACODA. Order 3. Order 4. COPEPODA. Order 5. DECAPODA. - Shell of mingled lime and chitin; ten-footed; large: Cambarus. Order 6. ARTHROSTRACA. -Thorax consisting usually of only six or seven segments; eyes sessile; small: Oniscus. § 2. Air-breathing. CLASS II. Onycophora.- Body soft, cylindrical, unsegmented; legs soft, unjointed: Peripatus. |