NOTES ON EMBRYOLOGY AND CLASSIFICATION. 



453 



Subclass^ Ordej-. 



fl. Rhamphorhyn- 



III. Pterosauria -{ chia . 



[_2. Pterodactyla . 



IV. DiCYNODONTA . . . . 



V. Ornithoscelida 



VI. Crocodilia . 



f 1. Teleosauria 

 J 3. Steneosauria . 



[j>. AUigatores 



Class II. — Aves. 



1. Saururse 



2. Ratitse . 



3. Carinatse 



Examples. 

 > Rhamphorhynclms. 



Pterodactylus. 

 {^ Dicynodon. 

 \ Rhpichosaurus. 

 C Megalosaurus. 

 < Igtcanodon. 

 (. Compsognathus. 



Teleosaurus. 



Steneosaurus. 

 f Crocodilus. 

 <v Gavialis. 

 [^Alligator, 



ArchcBopteryx, 

 f Stnothio. 

 \Apteryx. 



j Anser. 

 \_PsiUacus. 



Grades and Orders of the 



LIPOBRANCHIA AMPHICONDYLA. 



Class Mammalia. 



Grade A. Cloacalia. 



1. Platypoda 



2. Echidnida 



{ 



OrnitJiorliynchus. 



Echidna. 



Grade B. Marsupialia. 



< 



f~l. Barypoda 



2. Macropoda 



3. Rhizophaga . 



4. Carpophaga . 



5. Cantharophaga 



6. Edentula 



7. Creophaga 



8. Pedimana 



Nototherium. 

 f Macropus. 

 \llypsiprymmis. 



P/iascolomys. 



P/iascolarctus. 



Plialangista. 



Perafneles. 



Myrmecobhis. 



Tarsipes. 



f Basyurus. 



\Thylaciuus. 



T Didelpkys. 



\Chironectes, 



