14 



COMPARATIVE ANATOMY. 



(b.) AM N IOTA (Vertebrates which 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. Ratitse (Cursorial Birds Ostrich, Bhea, Emeu, &c.). 

 /3. Carinatse (Birds of night). 



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. 



Sirenia. 



Cetacea. 



Ungulata. 



Hyracoidea. 



Proboscidea. 



Rodentia. 



Cheiroptera. 



Insectivora. 



Carnivora. 



Lemuroidea. 



Primates. 



