APPENDIX. rWl. 



Tabular View of the Phyla of the Animal Kiii(/(lu)it. 



ANIMALIA. 



Organisms incapable of assimilating either N or C from their simpler 



water-soluble compounds, and therefore provided (excepting parasites) 



with the means of ingesting and acting upon the solid substance of 



other organisms. 



Grade I— PLASTIDOZOA (Homoblastica). 

 Animals consisting of single plastids, or of groups of plastids not 



differentiated into cell-layers. 



Protozoa. 



Grade II.-ENTEROZOA. 



Animals consisting of many plastids primarily arranged in two layers 

 surrounding a food-receiving cavity — the enteron (the lumen of which 

 is obliterated in some parasites). 



Grade 1 (of the Enterozoa) CCELENTERA (Diploblastica) . 

 Enterozoa in which the enteron remains as a continuous cavity, 

 either simple or much ramified, coextensive with the body wall. 

 Persons telostomiate, generally with radial sj'mmetry. 

 Phylum 1. — PoRiFERA. 

 „ 2. — Nem.atophora. 

 Grade 2 (of the Enterozoa) CCELOMATA (Triploblastica). 

 Enterozoa in which a second cavity containing haemolymph — viz., 

 the coelom— entirely shut off from, though in its origin a part of, the 

 enteron, is developed between the body wall and the enteric wall. 

 Persons primarily prostomiate, bilaterally symmetrical, with paired 

 nephridia and nerve tracts. 



Phylum 1. — Echinoderma. 



Branch a. Ambulacrata. 

 „ b. Tentaculata. 

 Phyl. Phtjl. Phyl. 



2. — Platyet-mia. -t. — Gephyr.ea. C..— Enteropneusta. 



Br. a. Ciliata. I I 



„ b. Suctoria. | I 



3 — Appf.ndiculata 5. — Mollusca (^Meso- 7. — Vertebrata. 



(Parapoda). poda). Br. a. Urochorda. 



Br. a. Chtetopoda. Br. a. Eucephala. „ b. Cephalo- 



„ b. Rotifera. „ b. Lipoce- chorda. 



, c. Gnatho- phala. „ c. Craniata 



poda. 

 Phyl. 8.— Nematoidea. Phyl. 'J.— Ch^tognatha, 



The above is extracted, with pel-mission, from "Notes on Embryology 

 and Classification for the Use of Students," by E. Ray Lankester, 

 M.A., F.R.S.. printed by J. and A. Churchill, New Burlington Street. 

 London, 1877. 



