Page 19 - maxson1928

II:,,

From Pliohippus the Mint Can.yon form differs both in size and in

the marked development of an entero-extern.a.l fold in the lower teeth.

Characters of the teeth are in a general way accordant with those of

Protohippus. Within this genus, however, no specific determination can be

made because the material is too scanty.
Measurements of No. 30041 u.c.

P -? Y-?
4· 1
Antero-pasterior diameter ------ 26 ------ 22.4

'11ransverse II 15.3 11.6 11.6

Antero-posterior di8Jlleter
metaconid-metastylif column---- 13.2 -------14.2 14.2

Height 24.5 24.5 18.4

MIOLABIS CALIFORNICUS sp. nov.

The type material for this species consists of the greater part

of the anterior portion of a skull {spec. No. 30046, u.c. Coll. Loe. 3568),

This specimen is illustrated in Plates II. and III. The cranial portion

is missing as is also the anterior portion of the prema.xilla. Crowns of

incisors, canines, and some cheek teeth are not present but those of the

premolar-molar series on both sides so supplement each other as to offer

a complete series for st'Udy. Some fracturing of the skull has taken plac.e,

but it does not involve serious deformation.

The presence of two upper incisors separates the individual from

the genus Procamelus in which the second upper incisor is lost. Cope

noted a tendency in Procamelus to retain this incisor during the youthful

stage. Superior molar one of the Mint Canyon camel is well worn and

indicates an adult stage.