522 



ZOOLOGY 



.SECT 



backwards so as to join the paroccipital process, \vliich is greatly 

 elongated. When an auditory bulla is developed, it is formed by 

 this bone, the tympanic being always small, and never ahkylosed 

 to neighbouring bones. The internal carotid artery perforates the 



orb 



cbd 



' "% 



FIG. 1131. Skeleton of Wallaby (Halmai. * ^utdabatus). The scapula is represented as 

 raised somewhat higher than it would be*i*. yfie natural relations of the parts ; the head of the 

 femur has been separated from the acetabulum. acet. acetabulum ; acr. acromion process ; 

 ast. astragalus ; cole, calcaneum ; cbd. cuboid ; chev. chevron bones ; cl. clavicle ; cun. cuneform 

 of carpus ; epi. epipubis ; fb. fibula ; fern, femur ; hd. head of femur ; hu. humerus ; il. ilium ; 

 isch. ischium ; obt. obturator foramen ; orb. orbit ; pis. pisiform ; pub. pubis ; rad. radius ; 

 r&i. first rib ; r&w. i as t rib ; sc. scapula ; st. sternum ; tb. tibia ; troch. great trochauter of 

 femur ; uln. ulna ; unc. unciform ; IV. fourth toe. 



basisphenoid. The optic foramen is not separate from the 

 sphenoidal fissure. In all except Tarsipes the angle of the 

 mandible sends inwards a remarkable process (ang.\ and is said 

 to be inflected. 



In inspectoral arch of the Marsupials the coracoid process is, 



