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COMPARATIVE ANATOMY 



Division A. 

 B. 



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ACRANIA (CEPHALOCHORDATA). 

 Lancelet (Amphioxus). 



GRANT ATA. 



/ o. A N A M N I A. 



Class I. CYCLOSTOMATA (Suctorial Fishes). 



Order 1. Myxinoidei (Hag Fishes Myxine, Bdello- 



stoina). 



,, 2. Petromyzontes (Lampreys). 

 Class II. PISCES (True Fishes). 

 Sub-class 1. ELASMOBBANCHII. 



Order 1. Pluyioxtomi (Sharks Selachii, and Rays 



Batoidei). 



,, 2. Holot-ephali (Chimzera, Callorhynchus). 

 Sub-class 2. TELEOSTOMF. 



( Order 1. Cro8sopterygii(Polypterus,Cala.michihys).} 

 ,, Chrondrostei (Acipenser, Polyodon). 



3. Holoxtt-i (Lepidosteus, Amia). 



4. Te.lv.oxli i. ^ 

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



Herring, Eel, Silnroids). 

 ., /*. Anocanthini (Cod, Flat-fishes). 

 ,, c. A canthopteri (Perch, Stickleback, 



Gurnard, Blenny). 

 ., d. Pharynyoynatlii (Wrasse). 

 ,, e. Plectognuthi (Q'runk- and File- 



tishes). 

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



horse). 

 Sub-class 3. DIPNOI. 



Order 1. Monopneumona (Ceratodus). 



,, 2. Dijmeumona (Protopterus, Lepidosiren). 

 Class III. AMPHIBIA. 



Order 1. Urodela. 



a. Perennibraiichiatu (Proteus, Siren, Necturus). 



{Derotremata (Amphiuina, 

 Menopoma) 

 Myctodera (Salamandra, Tri- 

 ton, Amblystoma), 

 2. Anuru (Frogs and Toads). 

 ., 3. Gymnophiona (Limbless Csecilians). 



/ /3. A M N i o T A. 



Class IV. REPTILIA. 



Order 1. Rhynchocephali (Hatteria). 

 ,, 2. Lacertilia (Lizards). 

 ,, 3. O/thidia (Snakes). 

 ,, 4. Chelonin (Turtles and Tortoises). 

 ,, 5. Grocodilia (Crocodiles and Alligators). 

 (.'lass V. AVES. 



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

 I. Carinatte (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. ElTTIIKKIA 01' MitNOUELPHIA. 



