522 



ZOOLOGY 



SECT' 



backwards so as to join the paroccipital process, which is greatly 

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

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

 to neighbouring bones. The internal carotid artery perforates the 



troch- 



ebd- 



FlG. 1131. — Skeleton of Wallaby {Salmaturus ualabatus). The scapula is 



raised somewhat higher than it would be in the natural relations of the parts ; the head of the 

 femur lias been separated from the acetabulum, acet acetabulum ; uci\ acromion process ; 

 ast. astragalus ; catc. calcaneum ; cbd. cuboid ; chev. chevron bones ; cl. clavicle ; cun. cunefoiin 

 of carpus ; epL epipubis ; fh. fibula ; fem. femur ; hd. head of femur ; ku. humerus ; it. ilium ; 

 isch. ischium ; obt. obturator foramen ; orb. orbit ; pia. pisiform ; 2^^b. pubis ; rad. radius ; 

 rb^. first rib ; ?'^i^. last rib ; sc, scapula ; st. sternum ; tb. tibia ; troch. great trochanter of 

 femur ; utn. 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 injieded. 



In \}a.ii fictoral arch of the Marsupials the coracoid process is, 



