14 



COMPARATIVE ANATOMY 



Division A. ACRANIA (CEPHALOCHORDATA). 

 Lancelot (Amphioxus). 



B. CRANIATA. 

 fa. AN AM N I A. 



Class I. CYCLOSTOMATA (Suctorial Fishes). 



Order 1. Myxinoidei (Hag Fishes My xine, Bdello- 



stoma). 



,, 2. Petromyzontes (Lamprevs). 

 Class II. PISCES (True Fishes). 

 Sub-class 1. ELASMOBRANCHII. 



Order 1. Plagiostomi (Sharks Selachii, and Rays 



Batoidei). 



,, 2. Holocephali (Chimaera, Callorhynchus). 

 Sub-class 2. TELEOSTOMI. 



( Order 1. CVos^ery^n(Polypterus,Calamichthys).] -| 



,, 2. Chrondroxtei (Acipenser, Polyodon). 

 [ ., 3. Holostei (Lepidosteus, Amia). 



,, 4. Tehostei. ^ 



Sub-order a. Physostomi (Carp, Pike, Salmon, 



Herring, Eel, Siluroids). 

 b. Anacanthini (Cod, Flat-fishes). 

 ,, c. A canthopteri (Perch, Stickleback, 



Gurnard, Blenny). 

 ,, d. Pharyngognathi (Wrasse). 

 ,, e. Plectognathi (Trunk- and File- 

 fishes). 



,, /. Lophobranchii (Pipe-fish, Sea- 

 horse). 

 Sub-class 3. DIPNOI. 



Order 1. Monopneumona (Ceratodus). 



,, 2. Dipneumona (Protopterus, Lepidosiren). 

 Class III. AMPHIBIA. 



Order 1. Urodela. 



a. Perennibranchiata (Proteus, Siren, Necturus). 



{Derotremata (Amphiuma, 

 Menoponm) 

 Myctodera (Salamandra, Tri- 

 ton, Amblystoma), 

 ,, 2. Annra (Frogs and Toads). 

 ., 3. Gymnophiona (Limbless Ca?cilians). 



A M N I O T A. 



Class IV. REPTILIA. 



Order 1. Rhynchocephali (Hatteria). 



,, 2. Lacertilia (Lizards). 



,, 3. Ophidia (Snakes). 



,, 4. Chelonia (Turtles and Tortoises). 



,, 5. Crocodilia (Crocodiles and Alligators). 

 Class V. AVES. 



a. Eatit(f (Cursorial Birds Ostrich, Rhea, Emu, &c.). 



b. Carinata (Birds of Flight). 



Class VI. MAMMALIA. 



Sub-class 1. PROTOTHERIA or ORNITHODELPHIA (the Ovi- 

 parous Monotremes Ornithorhynchus, 

 Echidna). 



,, 2. METATHERIA or DIDELPHIA (Marsupials- 

 Kangaroo, Phalanger, Opossum.). 



,, 3. ElTTHEKIA 01- MONODELPHIA. 



