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COMPARATIVE ANATOMY 



Saurapsida. 



Mammalia. 



(b. Amniota (Vertebrates which develop an amnion 

 during foetal life). 



1, REPTILIi. 



a. GriKodilia (Crocodiles and Alligators). 



li. Larertilia (Lizards, including Ratteria). 



y. Ghelonia (Turtles and Tortoises). 



S. Ophiditt (Snakes). 



2. AvES. 



a. Eatitce (Cursorial Birds — Ostrich, Rhea, Emu, itc), 

 (3. Carinatce (Birds of flight). 



1. Aplacentalia or Achorin. 



a. Prototheria or Ornithodelphia (Monotremata — Orni- 



thorhynchus and Echidna). 

 /3. Metathei-ia or Diddphia (Marsupialia — KaugarooSj. 



Phalangers, Opossums, &c.). 



2. Placentalia or Choriata. 



Eniheria or Monodelphia. 

 Edentata. 

 Sirenia. 

 Cetacea. 

 Ungulata. 

 Hyracoidea. 

 Proboscidea. 

 Rodentia. 

 Cheiroptera . 

 Insectivora. 

 Carnivora. 

 Lemuroidea 

 Primates. 



