DAKOTA AND NEBRASKA. 167 



more conspicuous than in the Musks and Deer. The entrance to the lachrymo-nasal 

 duct is internal to the position of the process, as in the former animals. 



No ant-orbital lachrymal fossa exists, the facial surface of the lachrymals being 

 nearly as even a plane as in the living Musks. 



The face below the orbit and its alveolar portion resemble the condition in the 

 latter animals. 



In advance of the lachrymal a vacancy exists, as in the Deer, apparently bounded 

 by the same bones. 



The maxillaries resemble those of the Deer. The infra^orbital foramen is likewise 

 situated as in this and the Musks, above the first of the closed row of molars. 



Upper view of the skull, figure 1, plate XIV. — In the upper view of the skull, the 

 cranium apj^ears a well-fonned oval, and is not narrowed immediately back of the 

 post-orbital arches. 



The forehead stretches Isackward, in a much narrower triangle than in the Musks, 

 to the sagittal crest, and to witlim alwut three-fourths of an inch of the summit of 

 the iniou. The bounding temporal ridges at first diverge comparatively gradually, 

 and then at their fore part more abruptly curve outwardly. 



From the position of the post-orbital arches, the forehead forms a broad sloping 

 plane, directed forward as in the Musks ; but it appears more depressed between the 

 position of the orbits, from a greater elevation of the supra-orbital borders. 



A pair of supra-orbital foramina, opening into a groove, occupy the same relative 

 position on each side of the forehead as in the Musks and Deer. 



The nose is broken away in all the specimens of Leptomeryx I have had the oppor- 

 tunity of inspecting, but judging from its contiguous parts it apj^ears to have had the 

 same form as in the Musks or Deer. 



Posterior view of the skull, figure 3, ^)?afe XIV. — The inion is triangular, as in the 

 Musks; is proportionately wider and lower than in these, but not so prominent 

 posteriorly. With the exception of the comparatively acute condition of its summit, 

 it resembles more that of the Deer in its appearance. From the median prominence 

 it inchnes on each side obliquely outward to the lateral acute borders separating it 

 from the temporal fossce. 



The occipital foramen and condyles nearly resemble those of the Musks in their 

 form, proportions and relations, and the same is the case with the paramastoid 

 processes. 



Inferior view of tJie sJatll, figure 4, p>^ate XIV. — The basal axis of the cranium is 

 proportionately wider and flatter than in the Musks, and in these respects resembles 

 more that in the Deer, 



The tympanies, in their proportions and relations, likewise bear a nearer resem- 



