332 



E. L. Troxell — -American Bothriodonts. 



Later^^ there was made a new genus Elomeryx, and the 

 description of the species was thus amplified from skulls 

 in the collection (Cat. Nos. 10177 and 10195) : 



"The specimen described ... as Heptacodon armahts proves 

 on examination to belong to a distinct genus, which may be called 

 Elomeryx. . . . Some of the main characters are as follows : — 

 The skull is elongate, with the facial part quite narrow. The 

 frontal region between the orbits is flat or even concave. The 

 orbits are very small, and not closed behind. There is no lachry- 

 mal fossa. The anterior narial opening is large, and the snout 

 broad. 



"There are the usual forty-four teeth. The upper incisors 

 diverge, and have short, compressed crowns. The upper canine 

 is very large and dependent. It is oval in outline near its base, 

 but compressed below, with a serrated posterior edge ; a feature 

 not before observed in ungulate mammals. There is a long dias- 

 tema behind the canine. The premolars and molars form a close 

 series. . . . 



"The posterior nares are placed well behind the molar series, 

 much as in existing swine. There is a postglenoid process, and a 

 long paroccipital. The type species has a small auditorial bulla, 

 and the other, a larger one. The zygomatic arch is slender, and 

 curved well outward. The temporal fossae are large, and sep- 

 arated above by a narrow sagittal crest. The brain was well 

 developed. The type specimen of E. armatus indicates an animal 

 about the size of a large deer. ' ' 



Additional characters of the type of E. armatus are 

 here given in contrast to another specimen made the 

 type of a new subspecies on a later page. 



Character j 



P^ diameters 



P* diameters 



form, ant. 



M^ cingulum 



parastyle 



M^ cingulum 

 (internal) 



parastyle t 



M^ cingulum ! 



styles 

 " O. C. Marsh, 



E. armatus armatus 

 Cat. No. 10176 



16 X 19 mm., wide 



20 X 15 mm. 



Convex, inner half oval 



Internal basal cusp 

 Cingulum on base of hypocone 



Moderate, weak groove pos- 

 terior 



Int. basal ridge. Proto- and 

 hypocone smooth 



Weak 



Int. basal ridge. Proto- and 

 hypocone smooth 



Not prominent 



This Journal (3), 48, 176-177, 



E. armatus angustus 

 Cat. No. 10393 



14.5 X 20.5 mm., narrow 



20.5 X 15 mm. 



Concave, anterior and poste- 

 rior sides parallel 



Encircles hypocone, broken 

 on protocone 



Very large and prominent 

 indentation posterior 



Encircles hypocone, broken 

 on protocone 



Marked by strong groove 



Extends onto and around 

 hypocone, broken on proto- 

 cone 



All large, prominent, and 

 well separated by grooves 



1894. 



