1918] Taylor: Revision of the Rodent Genus Aplodontia 451 
Saccophoriens (part) Gervais (1854), p. 364. 
Sciuroides (part) Brandt (1855), p. 151. 
Haploodontini or Prismatodontes Brandt (1855), p. 151. 
Sciuridae (part), Baird (1857), pp. 240, 350. 
Castorinae (part) Baird (1857), p. 350. 
Haploodontidae Lilljeborg (1866), table opp. p. 9. 
Haploodontoidea Gill (1872), p. 22. 
Haplodontidae Alston (1876), pp. 66, 75, 78. 
Haplodontiidae Cope (1883), p. 54. 
Aplodontidae Allen (1892), p. 31. 
Aplodontiae Thomas (1896), p. 1015. 
Aplodontiidae Thomas (1896), p. 1015. 
Haplodontoidea Weber (1904), p. 496. 
Aplodontoidea Matthew, in Osborn (1910), p. 534. 
Characterized by Matthew (1910, p. 69) as follows: 
1.0.2.3 
TONES? 
stylids. No postorbital process; zygomatic arch slender; skull wide posteriorly; 
postero-inferior portion of angle greatly inflected, posterior end everted. Foss- 
orial, Oligocene to recent. Genera, Aplodontia, Meniscomys [= Allomys], Myla- 
gaulodon.’’ 
«Teeth progressively hypsodont, with prominent mesostyles and meta- 
Fig. G 
Fig. F.  Allomys liolophus Cope, dorsal view of cranium. X 1. Univ. Calif. 
Coll. Vert. Palae., no. 1672; locality 898, John Day Beds, Oregon. 
Fig. G. Allomys cavatus Cope, dorsal view of cranium. X 1. Univ. Calif. 
Coll. Vert. Palae., no. 1444; locality 864, John Day Beds, Oregon. 
If Allomys is to be referred to the family Aplodontiidae a change 
in the above characterization will be necessary ; for postorbital pro- 
cesses are present in specimens of Allomys liolophus and A. cavatus 
in the University of California Collections in Vertebrate Palaeont- 
ology ( see text-figs. F', G). 
