DIDELPHrS. 



343 



flat, its edges with strong triangular projecting ledges, their tips 

 forming conical postorbital processes, from -which the temporal ridges 

 run backwards along the brain-case without meeting in the centre 

 line. Palatine foramina small, only reaching backwards to about 

 the level of the middle of the canines. Posterior palate compara- 

 tively perfect ; a pair of small narrow vacuities opposite ms.i * ^. 



Teeth. Upper canines rather thick and short. P.' from one sixth 

 to one third the size of p.' ; the latter and p.* about equal. Molars 

 as usual. Lower p.^ about one third and p.* about three quarters 

 the size of p.' 



i (in spirit). 

 Adult, 

 millim. 



Head and body 175 



TaU 248 



Lower leg 40 



Hind foot 24-5 



Ear 21 



Muzzle to eye 17 



Skull, see p. 351. 



Hab. Neotropical region from Costa Rica to Brazil ; apparently 

 not found in North-eastern South America. 

 Type in the Vienna Museum. 



J Ad. sk. I J, Costa Rica. J. Carmiol [C.]. 

 "• 1 Skull. ( °- (Figured by Alston, ;. e.) 



b. Yg. sk. Upper Amazons. Purchased. 



c. Skeleton, 2 (mounted). Peruvian Amazons. Mr. E. Bartlett 



[C.]. 



J i Ad. sks. 1 , o Sarayacu, Ecuador. Mr. 0. Bucklev 



'''"• jSkullofd.[ ^?- [CO. 



- J Ad. St. I Santa Cruz de la Sierra, Mr. T. Bridges 



•/• j Skull, f Bolivia. [CJ. 



j Ad. St. ( Bolivia. Mr. T. Bridges 



^- I Skull, f _ [C.]. 



, ■ J Imm. sk. I BoUvia. Purchased. 

 "■ I Skull. f 



. (Ad. al. j , m K ~\ (Described by Waterhouse.) 



*■ j Skull. [ ^ (& 5 young). ^ > 



. jimm. sk. 1 (2V»e of 2). ?M!ferAou«e!, Tomes.) 



'• ISkuU. f 



8. Didelphys muriiia. 



Mus sylvestris americanus, Seha, Thesaurus, i. pp. 48 & 49, pi. xxxi. 



figs. 1-5 (animal) (1734), and ii. p. 90, pi. Ixxxiv. fig. 4 (1735). 

 Didelphys murina, Idnn. Syst. Nat. (10) i. p. 55 (1760) ; Mull. Linn. 



Naturs. i. p. 293 (1773) ; Erxl. Syst. R. A. p. 80 (1777); Schreb. 



Sdug. iii. p. 545, pi. cilix. (animal) (1778) ; Zimm. Geogr. Oesck. 



ii. p. 225 (1780); Bodd. Blench. Anim. i. p. 77 (1785); Gmel. 



Idnn. S. N. i. p. 107 (1789) ; Kerr, Linn. An. K. p. 194 (1792) j 



