//. TYPES IN DETAIL IVITH THEIR SUBORDINATE GROUPS. 47 



Group B. Schizognathae. 



Sub-order 7. Cecomorphce .... x Podiceps, Alca, Larus, Sterna. 



Sub-order 8. Turhinares x Diomedea, Fulmarus. 



Sub-order 9. Grallcs x Grus, Charadrius, Scolopax. 



Sub-order 10. GallincB x Gallus, Perdix. 



Sub -order 1 1. Columbce x Columba, Didus. 



Sub-order 12. Trochilida x Trochilus, Lophornis. 



Sub-order 13. Pici. x Picus, Colaptes. 



Group C. ^githognathae 



Sub-order 14. Passer es. (Over half the known species of 



birds belong here.) 

 X Passer, Tyrannus, Hirundo, Pa- 

 radisea, Corvus. 



Super-class I. MAMMALIA . . . .Same as class: Mammalia, q. v. 



Class VI. BIAMMALIA Warm-blooded vertebrates. Body- 

 clothed with hair; young nourished 

 by milk, a secretion of integu- 

 mental glands. Quadrate in mid- 

 dle ear, two occipital condyles. 



Sub-class I. PEOTOTHERIA Low oviparous mammalia with rep- 

 tilian characteristics, such as an 

 episternum and well developed 

 coracoids. The young, immature 

 when hatched, are brooded either 

 in a nest or in a brood pouch tem- 

 porarily developed. No localized 

 mammary glands or nipples; but 

 the integument of the mammary 

 pocket is lactiferous. Alimentary 

 canal, urethra, and reproductive 

 ducts open into a common cloaca. 

 Order i. Monotremata With characteristics of the Sub- 

 class, Orniihorhynchus, Echidna. 



Two extinct Orders of Prototheria have been established. The 

 Protodonta, represented by lower jaws of two Jurassic species, and the 

 Multituberculata, represented by several genera founded upon numerous 

 teeth from the Upper Jurassic and Lower Eocene. The separation of 

 these Orders rests upon dental characteristics. 



