282 MARStJPIALIA. 



series of cheek-teeth being 0,0145, and that of the true molars 

 0,008. It would apparently be difficult to distinguish D. hunteri in 

 a fossil state. 

 Hob. Brazil. 



18890 d. Nine mandibular rami, probably belonging to this species. 

 These specimens appear identical with those to which Lund 

 applied the name D. afftnis-incance, the living form called 

 D. incana being described from Minas Geraes. 



18890 e. A slightly larger left mandibular ramus. 



murtna, Linn. 1 



Syn. Didelphyi qffinis-murines, Lund -. 



In two recent examples of this species (with which D. dorsigera 

 is apparently identical) the lengths of the lower series of cheek-teeth 

 are respectively 0,014 aud 0,0125, while that of the true molars 

 is 0,008 in both. 



Hob. Brazil, Guiana, Peru, and Mexico. 



18890 f. Three mandibular rami, probably belonging to this species. 

 In one specimen the length of the four true molars is 



0,0082. 



elegant, Waterhouse 3 . 



Syn. Didelphys qffinis-eleganti, Lund 4 . 



Length of the lower series of cheek-teeth in a recent specimen 

 0,011, and of the true molars 0,007. It may be doubtful whether 

 some of the following specimens do not belong to the short-tailed 

 D. brasiliensis (tristriata) of Brazil, which is said to agree in size 

 with D. elega ns. 



Hab. Chili, Bolivia (Recent), and (?) Brazil (Pleistocene). 



18890 g. Four mandibular rami, agreeing in size with the present 

 species. The length of the four true molars in one 

 specimen is 0,007. 



pugtlla, Desmarest 5 . 

 Syn. Didelphys affinis-pusillce, Lund 6 . 

 The length of the lower cheek-series in a recent example is 0,01 1, 



Syst. Nat. ed. 12, vol. i. p. 72 (1766). 



K. Danske Vid. Selsk. Skr. vol. viii. p. 298 (1841). 



Zoology of the Voyage of the ' Beagle,' pt. 2, p. 95 (1840). 



K. Danske Vid. Selsk. Skr. vol. ix. p. 133 (1842). 



Nouv. Diet. d'Hist, Nat. vol. ix. p. 430 (1817). 



K. Danske Vid. Selsk. Skr. vol. viii. p, 293 (1841). 



