JVo.7.] NIMRAVIDiE AND CANIDiE OF THE MIOCENE PERIOD. 175 



oblique one. There are wide posterior and anterior cingula, and five 

 cusps arranged as in the first molar. The internal cusp is relatively- 

 larger in this tooth. 



Measurements of sTcull. 



M. 



Length from occipital condyles to anterior border of last premolar 186 



Length, from occipital condyles to palatal edge 135 



Length from occipital condyles to line of anterior border of glenoid fossa 051 



"Width of occiput above 046 



Width at posterior origin of zygomata 071 



Width between orbits (least) 077 



Width at middles of first molar teeth 098 



Width between first molar teeth 040 



Elevation of occiput, with condyles 082 



Elevation of muzzle at front of fourth premolar 043 



Diameters first molar I ^'^t^^^-Po^t^"^^ ^^l 



( transverse 016 



( -antero-posterior , 022 



Diameters second molar | ^^.^^^^^^^^ 0^9 



This species is easily distinguished from those which have been dis- 

 covered heretofore, by its large size, by the peculiar form of its molar 

 teeth, and by its flattened muzzle. The specimen above described was 

 discovered by Capt. Bmmett Crawford, Third Cavalry, TJ. S. A., on the 

 upper waters of the Big Cheyenne River, Dakota, in a bed of the White 

 Eiver formation. It was presented to me by Dr. William H. Corbusieur, 

 U. S. A., to whom my especial thanks are due. 



Protolabis prehensilis sp. nov. 



This camel is supposed to have existed on the evidence of portions of 

 the mandibles of two individuals. These include the symphyseal por- 

 tion, and one of them the ramus as far posteriorly as the first true 

 molar, inclusive. These remains indicate a robust species of the size of 

 the Procamelus angustidens, or between the P. gracilis and P. robustus. 



The most marked peculiarities of this species are the following : The 

 canine and first premolar are very robust, and the latter is one-rooted 

 and with an oval section at the base like the canine. The second pre- 

 molar is also one-rooted, while the third and fourth are two-rooted, and 

 difi"er very little in size from each other. The first true molar is abruptly 

 larger, although narrowed in front. The root of the second iiremolar 

 is round and of robust proportions, its diameter being one-half linear 

 that of the first. The roots of the incisors are robust, that of the first 

 being rather larger than that of the third. The symphysis terminates 

 a little behind the line of the first premolar. The mental foramen is 

 unusually extended in the antero-posterior direction . 



Measurements of sJcull. 



Length of symphysis (No. 1) 080 



Length of bases of incisors and canine 043 



Diameters of canine^ antero-posterior 016 



transverse .* Oil 



