52 



"With the left ramus, above described, is arbitrarily associated, as probably referable to 

 the same species, the abbreviated coossified nasal bones figured in plate VI, fig. 3, (collection 

 of 1904). The specimen includes the bases of the horns which are seen to have been placed 

 far forward aud some distance apart. The horns apparently pointed laterally outward and 

 upward, as in M. angustigenis and M. coloradensis, but were much farther forward than in 

 either of these species. These nasals are entirely different from those of M. selwyniantes, and 

 M. syceras ; they are short, thick, and broadly obtuse in front where they are but slightly 

 bent downward. The front and lateral margins are thick and rounded, and the former is 

 deeply notched in the middle. The lower surface is, as a whole, shallowly concave, a low 

 longitudinal median ridge marking the line of union of the two bones. The concave surface 

 between the horn bases is shallowly and evenly curved. The horns at the base appear to 

 have been longitudinally oval in transverse section, but a definite statement in this regard 

 cannot be made, as the horn bases are imperfect posteriorly. The specimen is, on the line of 

 coossincation of the two bones, 70 mm. back from the front margin, 44 mm. thick. 



The shortness and general robustness of the nasals, with like characters noticeable in the 

 proportions of the above ramus, makes it appear probable that these specimens represent a 

 single species. 



FIG. 12 



xf 



FIG. 13 



** 



Coossified nasals of Megaeeropi assinibou ntis, fig. 12 superior aspect, fig. 13 left lateral aspect. One-fourth the natural size. 



The two species, angustigenis and syceras, have the general form of horn found in the type 

 of the genus Megarerops, viz., M. coloradensis, Leidy. In the other three species from the 

 Cypress hills the horns are not known. In tour of the five species, however, the nasals are 

 known and show a wide variation in shape, all differing from those of the type. 



