1024 MR. OLDFIELD THOMAS ON THE [Dec. 15, 
E. HYSTRICOMORP HA. 
XII. Pedetide’. 
119. Pedetes, Il. 
Prodr. Syst. Mamm. p. 81 (1811). 
XIII. Octodontide. 
A. CrenopACTrYLIN2z. 
120. Ctenodactylus, Gray. 
Spic. Zool. p. 10 (1830). 
121. Massoutiera, Lat. 
Le Nat. 1885, p. 21. 
122. Pectinator, Bly. 
J.A.8. B. xxiv. p. 294 (1855). 
123. Petromys, A. Sm. 
S. Afr. Q. J. ii. p. 2 (1831). 
B. OctopontTiIn £. 
124. Ctenomys, De Blainy. 
Bull. Soc. Philom. 1826, p. 62. 
125. Aconaemys, Amegh. 
Revist. Argent. i. p. 245 (1891). [Schi- 
zodon, Waterh. P. Z. 8. 1841, p. 91, nec 
Agass. | 
126. Spalacopus, Wag]. 
Isis, 1832, p. 1219. 
127. Octodon, Benn. 
P. ZS. 1832, p. 46. 
128. Abrocoma, Waterh. 
P. Z. 8. 1837, p. 30. 
C. LONCHERIN 2. 
(a) 129. Dactylomys, Is. Geoff. 
Ann. Sci. Nat. (2) x. p. 126 (1838). 
130. Thrinacodus, Giinth. 
P. Z.S. 1879, p. 144. 
? While many naturalists have noticed the Hystricomorph affinities of 
Pedetes, no one in modern times (except Dobson, who transferred the whole 
of the Dipodidz) seems to have thought of actually placing it among them. 
To me this appears to be clearly the proper course, as there seems to 
be scarcely a character in its skull or teeth which is not found in one 
member or another of that group. Even its lower jaw is of a partially 
Hystricine type, and in any case is not of sufficient importance to outweigh its 
many affinities to the Hystricomorpha. Wiegmann in 1832 placed it among 
his “‘ Lagostomi” (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 Dipodidx, until Winge, 
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 Pedetes would best be 
placed. Its skull is very like that of Thryonomys, its teeth like those of 
Spalacopus, while it has also some resemblances to the Chinchillids. 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, 
