1024 Mil. OIiDFIBTjD THOMiS ON THE [DeC. 15, 



E. HYSTEIOOMOEPHA. 



XII. Pedetidffi'. 



119. Pedetes, 111. 



■ Prodr. Syst. Mamra. p. 81 (1811). 



XIII. OctodontidsB. 



A. CtenodactvlinvTS. 



120. Glenodactylus, Gray. 



Spic. Zool. p. 10 (1830). 



121. Massoutiera, Lat. 



Le Nat. 1885, p. 21. 



122. Pectinator, Ely. 



J. A. S. B. xxiv. p. 294 (1855). 



123. Petromys, A. Sm. 



S.Afr. Q.J. ii. p. 2(1831). 



B. Ootodontinjb. 



124. Gtenomys, De Blainv. 



Bull. Soc. Philom. 1826, p. 62. 



125. Aconaemys, Amegli. 



Revist. Argent, i. p. 245 (1891). [Schi- 

 zodon, AVaterh. P. Z. S. 1841, p. 91, ncc 

 Agass.] 



126. Spalacopiis, Wagl. 



Isis, 1832, p. 1219. 



127. Octodon, Benn. 



P. Z. S. 1832, p. 46. 



128. Abrocoma, Waterh. 



P. Z. S. 1837, p. 30. 



C. LONOHBEINiE. 



(a) 129. Dactylomys, Is. Geoff. 



Ann. Sci. Nat. (2) x. p. 120 (1838). 

 130. Thrinaeodas, Giinth. 



P.Z.S. 1879, p. 144. 

 ' While many naturalists havo noticed the Hystrioomoi-ph affmitiea of 

 Fedetes, no one in modern times (except Dobson, who transferred the whole 

 of the Uipodidse) seems to have thought of actually placing it among them. 

 To me this appears to be clearly the pi-oper course, as there seems to 

 be scarcely a character in its skull or teetli which is not found in one 

 member or another of that group. Even its lower jaw is of a piu-tially 

 Ilystricino typo, and in any case is not of eulllcicul importance to outweigh i[a 

 many allhiities to the llystricomorpha. Wiegmann in 1832 placed it among 

 his " Layostomi " (Handb. Zool. p. 56), but that was apparently rather by 

 accident than good judgment, as his general classification is of a very antique 

 type. All other authors seem to have kept it in the Dipodida% imtilWiuge, 

 in his general alteration of positions, placed it with Anomalurus, an allocation 

 with which I feel quite unable to agree. 



Within the Hystricomorpha it is difficult to say where Fedetes would best be 

 placed. Its skull is very like that of Tiiryonomys, its teeth like those of 

 Sj>alacopus, while it has also some resemblances to the Ohinchillida;. For the 

 present, therefore, until further researches are made, I have put it at the 

 beginning of the group, where it will occupy the same serial position as in 

 Alston's paper, although shifted into a different section. 



