30 Classification of the Animal Kingdom. 



h. Those which feed on vegetables (Herbivora). 

 c. Animals of the whale kind [Cetaceans). 



The class of Birds is divided into four orders. 



a. Birds of prey (Incessores). 



b. Climbers (Scansores). 



c. Wadei's [Graltatores). 



d. Swimmers [Natatores). 



The class of Reptiles is divided into five orders. 



a. Large reptiles with hollow teeth, most of which are now extinct 



[Rhizodonts). 



b. Lizards [Lacertans). 

 - c. Snakes [Ophidians). 



d. Turtles {Chelonians). 



e. Frogs [Batrachians). 



The class of Fishes is divided into four orders. 



a. Those with enamelled scales, like the gar-pike Lepidosteug 



[Ganoids). 



b. Those with the skin like shagTeen, as the sharks and skates 



[Placoids). 



c. Those which have the edge of the scales toothed, and usually 



with some bony rays to the fins, as the perch [Ctenoids). 



d. Those whose scales are entire, and whose fin rays are soft, like 



the salmon [Cycloids). 



n. Department of Articulata. Animals whose body is composed of 

 rings or joints. It embraces three classes. 



1. Insects. 



2. Crustaceans, like the crab, lobster, &c. , 



3. Worms. 



The class of Insects includes three orders. 



a. Those which have jaws for dividing their food [Manducata). 



b. Those with a trunk fur sucking fluids, like the butterfly [Sue- 



toria). 



c. Those destitute of wings, like fleas [Aptera). 



The class of Crustaceans may be divided as follows : — 



a. Those fm-nished with a shield, like the crab and lobster [Mala- 



costraca). 



b. Such as are not thus protected [Entomostraca). 



c. An extinct race, intermediate betvv'een these two [Tritobites] , 



The class of Worms comprises three orders : 



a. Those which have thread-like gills about the head ( Tubuli- 



branchiata). 



b. Those whose gills are placed along the sides (Z)orsi6rancA?ai«). 



c. Those which have no exterior gills, like the earth-worm [Abran- 



chiata). 



III. The department of Mollusca is divided into threeclasses, namely : 



1. Those which have arms about the head, Uke the cuttle-fish 



[Cephalopoda] . 



2. Those which creep on a flattened disc or foot, like snails [Gas- 



teropoda). 



3. Those which have no distinct head, and are enclosed in a biva vie 



shell, like the clams [Acephala). 



The Cephalopoda may be divided into — 



a. The cuttle-fishes, properly so called [Teuthideans). 



b. Those having a shell, divided by sinuous partitions into numer- 



ous chambers [Ammonites). 



