ZOOLOGY. 499 



If these cysts be repeated in the direction of the axis, 

 the tegument becomes an annulated skin. An annulose 

 animal is a multiplied cystic animal. Associated with 

 this character, the respiratory organs are gradually evolved 

 to form vascular plexuses, branchiae, feet, tracheae, and 

 wings, while the sexual parts are for the most part 

 separated Ancyliozoa, Respiratory animals. 



3093. The osseous system first appears in the Fishes, 

 along with imperfect, mostly tendonless, and only white 

 muscles, as also a myelon that is only developed into a 

 stunted encephalon, in which the brain-organs of the 

 Thricozoon are in great part wanting. 



3094. Typical, or true muscles, provided with tendons, 

 and of a red colour, are first exhibited in the Reptilia. 



3095. A complete nervous system, pretty similar to 

 that of the Thricozoa or Pilose animals, having a cere- 

 brum and cerebellum, with similarly distributed and 

 delicate nerves, is first displayed in Birds. 



3096. According to the anatomical systems there are, 

 therefore, six divisions of animals : 



A. Splanchnozoa. 



1. Intestinal animals . . Protozoa. 



2. Vascular . . . Conchozoa. 



3. Respiratory . . Ancyliozoa. 



B. Sarcozoa. 



4. Osseous animals . . Pisces. 



5. Muscular . . Reptilia. 



6. Nervose Aves. 



3097. The Pilose animals first originate through 

 completion and combination of all the organs of sense. 

 They are ^Esthetic or Sensorial animals. 



3098. The arrangement of animals, according to the 

 organs of sense, coincides consequently with that derived 

 from the anatomical systems, and each animal division is 

 therefore determined by two principal organs, by a vege- 

 tative and an animal. Every animal is at once a vegetable 

 and animal body, the inferior kinds being partly so, 

 but the highest or the Pilose animals entirely so, or in 



