R. S. Lull — New Tertiary Artiodactyls. 97 



in Antilocapra. Herein Aletomeryx agrees with D. anti- 

 lopinus. The palatine bones show much the same devel- 

 opment in Aletomeryx and the prongbuck, and the grooves 

 leading forward from the anterior palatine foramina over 

 the surface of the maxillaries are comparable. In none 

 of the crania before me is it possible to recognize the 

 vomers. As preserved, the sphenoid extends clear for- 

 ward into the posterior nares, forming the only visible 

 axis of the skull (see fig. 4 C), whereas in Antilocapra at 

 least one half the basal axis from the hinder margin of 

 the hard palate to the foramen magnum is formed by the 

 vomers. This apparent distinction may be merely acci- 

 dent of preservation. The form of the palate between 

 the cheek teeth varies in the different Aletomeryx skulls 

 as it does in two of the prongbuck skulls before me. In 

 the latter, the tooth series form straighter lines in the 

 male than in the female. In Aletomeryx I can not see 

 that this variation in the degree of curvature is in any 

 way determined by sex, but on the other hand is a matter 

 of individual variation pure and simple. As in Antilo- 

 capra, the outline of the palate is generally sharply con- 

 stricted just in front of the tooth series. In No. 10747 

 (female), on the other hand, this is not evident. In no 

 skull is the muzzle preserved, so that there is no direct 

 evidence of the presence or absence of upper canine teeth. 

 In all the great profusion of teeth, however, that were 

 recovered from the quarry, some vestige of a canine 

 would surely be present had such been a characteristic of 

 the animal, especially as they were most diligently sought 

 for. It is negative evidence, but to me conclusive in 

 favor of the belief that this genus possessed no such tusk- 

 like canines as did Blastomeryx (see fig. 25). The lower 

 canines are present, incisiform, and form part of the 

 incisor series without diastema. 

 The cranial measurements follow : 



Aletomeryx 



10760 

 Young 



10732 10744 10749 unworn 



mt 'd. sp 'm. mid-adult adult dent, 



m. m. m. m. 



Length over all (est.) -1712 -170 ? ? 



Width of brain case -043 -048 -0473 % 



Maximum width (zygoma) -078 ea. -080 % ca. -080 



Height ant. to orbit 032 -035 ? -035 



Vert. diam. of orbit -020* est. -027 -020 -026 



Occipital height ■ . -0335 -035 -028* ? 



Occipital width -044 ca. -042 -0445 % 



Width of palate at M 2 ca. -028 -029 -0264 ca. -032* 



* Crushed. 



