14 



COMPARATIVE ANATOMY. 



(b.) AMNIOTA (Vertebrates wliicli develop an amnion during 

 foetal life). 



1. KEPTILIA. 



a. Crocodilia (Crocodiles and Alligators). 

 /3. Lacertilia (Lizards). 

 y. Chelonia (Turtles and Tortoises). 

 Sauropsida. \ 8. Ophidia (Snakes). 



2. AVES. 



a. Batitae (Cursorial Birds Ostrich, Bhea, Emeu, &c.). 

 |8. Carinatse (Birds of flight). 



3. MAMMALIA. 



a. Prot'otheria or Ornithodelphia (Monotremata 



Ornithorhynchus and Echidna). 

 /3. Metatheria or Didelphia (Marsupialia Kan- 



garoos, Phalangers, Opossums, &c.). 

 y. Eutheria or Monodelphia (Placentalia). 



Edentata. - s\otv 



Sirenia.- 



Cetacea. - - 



Ungulata. ' r^ 



Hyracoidea. - ^ 



Proboscidea. ~ * 



Rodentia. - 



Cheiroptera. - 



Insect! vora. - 



Carnivora. - 

 ^- Lemuroidea. r- 



Primates. 



- 



