. Bulletin of the Department of Geology. Geology. The Mohave form is distinguished from Tephrocyon rurestris and T. hippophagus by the smaller, more slender teeth. From T. Jcelloggi it differs in the relatively larger Ma, smaller M2, and smaller meta- conid in Mx. M1 in the Barstow specimen measures 17 mm. in antero- posterior diameter as compared with 9 mm. in anteroposterior diameter in Mo. In T. kelloggi the anteroposterior diameter of M1 is 15 mm.; of M2, mm. There is a small hypo- conulid on the heel of M1 in the Barstow specimen, while in the type of T. kelloggi this tubercle is not
. Bulletin of the Department of Geology. Geology. The Mohave form is distinguished from Tephrocyon rurestris and T. hippophagus by the smaller, more slender teeth. From T. Jcelloggi it differs in the relatively larger Ma, smaller M2, and smaller meta- conid in Mx. M1 in the Barstow specimen measures 17 mm. in antero- posterior diameter as compared with 9 mm. in anteroposterior diameter in Mo. In T. kelloggi the anteroposterior diameter of M1 is 15 mm.; of M2, mm. There is a small hypo- conulid on the heel of M1 in the Barstow specimen, while in the type of T. kelloggi this tubercle is not suggested. The heel of M2 seems somewhat shorter than in T. kelloggi. P4 and P3 both possess a posterior cusp and a post- erior basal tubercle. P4 shows a small anterior basal tubercle. The anterior side of P:. is not preserved. Several specimens of mandibles slightly larger than no. 19402 represent a Tephrocyon species from the Barstow beds very near T. temerarius. It is possible that they belong to another species, but age and sex are presumably competent to account for the differ- ences. A portion of an upper jaw, no. 21512, with M1 and M2 imperfectly preserved (fig. 8) shows a form of molar teeth near that in T. rurestris, the type species of Tephrocyon. A portion of an upper jaw, no. 21513, with fragments of the premolars also suggests the characters of Fig. 8. Teph- rocyon, near rurestris (Con- don ). M1 and M2, no. 21512, occlusal view, natural size. Barstow M i o - cene, Mohave Desert, Califor- nia. Fig. 9. Canid, sp. small. Frag- ment of man- dible, no. 19463, lateral and dor- sal views, X Barstow Mio- cene, Mohave Desert, Califor- nia. AELUEODOX, near WHEELEEIANUS Cope Several mandibles in the collection from the Barstow represent large, heavy-jawed canids of the Aeluroclon type (figs. 10 and 11). Unfortunately no one of the several specimens shows the dentition well enough to permit a fully satisfactory comparison with the described material. In general
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