57O MANUAL OF ZOOLOGY. 



Siberian Drift. The fossil Quadrumana^ too, of Europe, all 

 belong to the Catarhine section of the order. 



It is unnecessary to pursue the subject further, but no law 

 is more firmly established than this : " That with extinct as with 

 existing Mammalia, particular forms were assigned to particular 

 provinces; and that the same forms were restricted to the 

 same provinces at a former geological period as they are at 

 the present day " (Owen). It is to be borne in mind, however, 

 that the law, as just stated, holds good for the later Tertiary 

 period only, and does not apply, in any manner that admits of 

 being traced, to the earlier geological epochs. 



TABULAR VIEW OF THE CHIEF SUB-DIVISIONS 

 OF THE SUB-KINGDOM VERTEBRATA. 



SUB-KINGDOM VI. VERTEBRATA. 



CLASS I. PISCES. 



Order i. Pharyngobranchii. 



2. Marsipobranchii. 



3. Teleostei. 



4. Ganoidei. 



5. Elasmobranchii. 



6. Dipnoi. 

 CLASS II. AMPHIBIA. 



Order i. Labyrinthodontia. 



2. Ophiomorpha. 



3. Urodela. 



4. Anoura. 

 CLASS III. REPTILIA. 



Order i. Chelonia. 



2. Ophidia. 



3. Lacertilia. 



4. Crocodilia. 



5. Ichthyopterygia. 



6. Sauropterygia. 



7. Anomodontia. 



8. Pterosauria. 



9. Deinosauria. 

 CLASS IV. AVES. 



Order i. Natatores. 



2. Grallatores. 



3. Cursores. 



4. Rasores. 



