508 



ZOOLOGY 



SECT. 



bones (Fig. 1143, epi.) elongated and compressed bones which 

 articulate posteriorly with the anterior edge of the pubes : in the 



nas 



Icr 



p.mctsc 



ff 



s.oc 



FIG. 1144. Skull of Dasyurus (lateral view), al.sph. alisphenoid ; any. angular process o 

 mandible ;//. frontal ; ju. jugal ; Icr. lacryiua) : max. maxilla ; nas. nasal ; oc. cond. occipital 

 condyle ; par. parietal ; par. oc. par-occipital process ; p. max. pre-maxilla ; s. oc. supra- 

 occipital ; sq. squamosal ; sq'. zygomatic process of squamosal. 



Thylacine they are represented only by small unossified fibro- 

 cartilages. In the leg the fibula is always well developed. In the 



young condition of some 

 Marsupials there is an ac- 

 cessory element situated out- 

 side the fibula at its proxi- 

 mal end : this apparently 

 corresponds to a bone 

 known as the parafibula 

 which occurs in some Lacer- 

 tilia. In the Phalangers 

 (Fig. 1147) and the Koala 

 there is always a consider- 

 able range of movement be- 

 tween the fibula and the 

 tibia, comparable in some 

 degree to the movements of 

 bas.spTi pronation and supination of 

 the radius and ulna. The 

 foot (Figs. 1147, 1148), as 

 already stated in the ac- 

 count of the external char- 

 acters, presents a much 

 greater range of modifica- 

 tion than the manus. 



Skeleton of Edentata. 

 In the Armadillos more or 

 fewer of the cervical verte- 

 brae are ankylosed together 



ft at 



esc.oc 



bas.oc 



FIG. 1145. Skull of Rock Wallaby (Peirogalf 

 penicillata) (ventral view). Letters as In Fig. 

 1144, except ali. alisphenoid. In addition, 

 has. oc. basi-occipital ; bas. sph. basi-sphenoid ; 

 ex. oc. ex-occipital ; pal. palatine ; pt. pterygoid ; 

 ty. tympanic. 



