618 



THE AMEBIC AX NATURALIST [Vol. XLIII 



While there is undeniably a series of forms connecting Camo- 

 lestes with the Diprotodonts in tooth structure, yet Caenolestes 

 itself is so generalized in this respect that we may perhaps in 

 the absence of other corroborating characters, question its in- 

 clusion within this group. Possibly it may be found to be an 

 offshoot from the Polyprotodonts, as it appears structurally to 

 be more generalized than any Diprotodont, and therefore it 

 might well occupy a separate suborder, as Thomas suggested— 

 the Paucituberculata of Ameghino. 



Pauline H. Dederer. 



May 26, 1909. 



LITERATURE 



Cope, E. D. Foramina Perforating the Squamosal in Mammals. Proc. 



Am. Phil. Soc, 1880. 

 Osborn, H. F. Evolution of Mammalian Molar Teeth. 1907. 

 Sinclair. Report of the Princeton Patagonian Expedition, 1896-1899. 



1901-1906. 



Thomas, O. On Ca?nolestes, a still Existing Survivor of the Epanorthidse 

 of Ameghino. Proc. Zool. Soc, 1905, p. 870. 



