510 



ZOOLOGY 



SECT. 



In the Armadillos the skull (Fig. 1149) is broad and flat, the 

 facial region triangular. The tympanic (ly.) is in some developed 

 into a bulla. The bony auditory meatus is in some cases elongated. 

 The zygoma is complete. The pterygoids are small, and do not 

 develop palatine plates. The mandible has a well-developed ramus 



with a prominent coro- 

 noid process and a well- 

 marked angular process. 



In the American Ant- 

 eaters (Figs. 1150 and 

 1151) the skull is ex- 

 tremely long and narrow 

 the facial region being 

 drawn out into a long, 

 narrow rostrum, with the 

 external nares at its ex- 



ent.cun 

 mes.cun 



FIG. 1147. Bones of leg and foot of Phalanger. ast. 

 astragalus ; calc. calcaneum ; cub. cuboid ; eel, cun. 

 ecto-cuneiform ; ent. cun. ento-cuneit'orm ; fb. fibula ; 

 mes. cun. meso-cuneiform ; nav. navicular ; lib. tibia; 

 IV, digits. (After Owen.) 



IV 



FIG. 1148. Bones of right foot of 

 Kangaroo (Macropus). a. astra- 

 galus ; c. calcaneum ; cb. cuboid ; 

 e :i . ento-cuneiform ; n. navicular ; 

 II V, digits. (After Flower.) 



tremity. The olfactory fossae are greatly developed. The rostrum is 

 composed of mesethmoid, vomer, maxilte, and nasals the pre- 

 maxillse being very small. The zygoma is incomplete, and the 

 orbit is not closed behind by bone, the post-orbital processes of 

 the frontal being entirely absent. The pterygoids (pter.), in all 

 but Cycloturus, develop palatine plates. There is no bony auditory 

 meatus. The mandible is entirely devoid of ascending ramus 



