and caudal vertebras. A rudiment of the anapophyais is first discernible on the eleventh 

 dorsal : the process gradually increase* to the last doraal, diminishes in the lumbar, and dis- 

 appears in the last of that series. The sutures between the short straight pleura|x>|ili\ is 

 and diapophysis of the first lumliar rertebra still in a great degree remain ; the anchylosis is 

 only partial, and the proportion of the autogenous and exogenous elements of the w. called 

 'transverse process' are plainly demonstrated. The diapophrsis, moreover, is not nuppiMHd 

 on the last dorsal vertebra, as in some of the Quadmmana, Carmieora and Rodmtia. The 

 serial homology of the transverse processes of the lumbar vertebra* is here, therefore, mani- 

 fested it) the most unequivocal way ; both metapophyse* and anapophyscs coexist with diapo- 

 physes in the last four dorsal and the first three lumW vertebra. So that, whether the 

 metapophysis or the ana|x>physis be the part called 'tubercle' by some Anthropotomists, 

 neither of them are, in the lumbar vertebra?, the process named transverse ' in the thoracic 

 vertebra?: that process, to which the name ' diafiophysis ' is restricted in the present Cata- 

 logue, is continued distinctly into the lumbar region, and is there lengthened out by a super- 

 added ' pleurapophysis,' which is ossified from a distinct centre in the Wombat. 



Presented by Sir Everard Home, Bart., J'.P.R.S. 



1793. The skull of the Wombat (Pkascolomy* I'ombatiu). 



It is remarkable for its breadth, the flatness of the upper surface, the strength of the arched 

 zygomata, and the extraordinary expansion of the inflected angle of the lower jaw. 



Presented by Sir Everard Home, Sort., F.P.R.S. 



1794. The mutilated skull of a Wombat (Pkasrolomy* Vombatut), prepared to ex- 

 hibit the teeth. 



The formula of these is,' i }=}, p j=i, M =24. All the teeth are long, deeply im- 

 planted, curved in segments of a circle, and with an undivided and uncontracted bane. The 

 lower incisors are the least curved. The premolars present no trace of that compressed 

 structure which characterizes them in the Koala and Kangaroos, but hare a wide oval trans- 

 verse section ; those of the upper jaw being traversed on the inner side with a slight longitu- 

 dinal groove. The true molars arc double the size of the premolars : the superior one* are 

 also traversed by an internal longitudinal groove, but this is so deep and wide that it divides 

 the whole tooth into two prismatic portions, with one of the angle* directed inwards. The 

 inferior molars are in like manner divided into two trihedral portions, but the intervening 

 groove is here external, and one of the facets of each prism is turned inwards. 



Presented by Sir Everard Home, art., r.P.R.8. 



1795. The skull of a Wombat (Phascolomys t'ombattui), longitudinally and vertically 

 bisected. 



Part of the suture* between the superoccipilal and exoccipitaU remain. The carotids per- 

 forate the basisphenoid. The bones are numbered on coloured labels according to the TABLE 

 or SYNONYMS. 



Svf 



