910 ROBERT COLLETT, 



The 2°^ sacral vertebra is posteriorly ankylosed to the P* sacral 

 vertebra and the pelvis only with the upper end of the proc. trans- 

 versus; the two foramina between both vertebrae are thus compara- 

 tively Wide. The 2"'^ sacral vertebra is well developed ; it only bears 

 a mere trace of proc. spinosi. The 3"^*^ vertebra of the os sacriim 

 is formed by the 1^* tail vertebra, which has firmly ankylosed to the 

 two sacral vertebrae. This also bears au almost imperceptible trace 

 of a proc. spinosus, and in this respect ditfers from the other tail 

 vertebrae ; but the strong proc. transversi are, as on the nearest verte- 

 brae of the tail, bent quite outwards, or slightly backwards, and on their 

 obliquely cut otf margin (as in these) the lower end is the longest, not, 

 as in the 2 sacral vertebrae, the upper. 



On the P' free tail vertebra the proc. trans versus is directed 

 straight outwards , on the two foUowing backwards ; in the 4*'' the 

 process is short and broad, and its end is directed forwards. The 

 others are without transversa processes. 



The haemal arches are already present on the 2°^ free tail ver- 

 tebra. 



The exact nmnber of vertebrae in the tail cannot be given. 

 There are present 12 (that ankylosed with the pelvis included), and 

 there may be wanting possibly 3 or 4, total number 15 — 16. 



The teeth: 



The dentition is complete: i t-, ^ i-, P h '"^ i (30)- 



Both individuals are fullgrown, and p^ is the premolar in use. 

 In structure, the teeth do not dilfer from the detailed description of 

 this species, given by Ramsay and Owen. 



Fam. Phalangistidae. 



40. JPhalangista vulpecula (Keer) 1792. 



Didelphis vulpecula Keek, Anim. Kingd. vol. I, p. 198 (1792). 

 Didelphis vulpina Shaw, Gen. Zool. vol. I, p: 53 (1800). 

 Phalangista vulpecula Thomas, in: Ann, Mag. Nat. Hist. (5. ser.) vol. IV, 

 p. 397 (1879). 



A. Young. 



B. Herbert Vale, June 1883 (incomplete skeleton with skull). 



C. Rockhampton, Aug. 1883 (skeleton). 



D. Rockhampton, Aug. 1883 (skeleton). 



E. Rockhampton, Aug. 1883 (skin with skull). 



