50 SYSTEMATIC PALEONTOLOGY 



a gum so long that the canal could not close, as is the case in the 

 latter. The absence of the long series of mental foramina characteristic 

 of the true whales is further evidence to this effect." Cope, 1895. 



Ulias moratus Cope. 

 Plate XXIV, Figs, la, lb; Plate XXV, Fig. 6. 



Ulias moraius Cope, 1895, Proc. Amer. Philos. Soc, voL xxxiv, p. 141, pL vi, fig. 1. 



Description. — " This species is founded on a nearly entire right man- 

 dibular ramus. The condyle and angle are wanting, as is also a piece 

 from the proximal part of the distal third of the length. This piece 

 was found with the rest of the specimen, but has been, for the present 

 at least, mislaid. 



" The ramus is moderately curved horizontally, but is not decurved 

 except towards the angle. A slight convexity of the inferior margin 

 exists at the anterior part of the proximal two-fifths of the length. 

 The superior border is occupied with the widely open alveolar groove, 

 which gradually contracts in transverse diameter distally, so as to be 

 closed for the terminal fourth of the length. On this region two or 

 three large foramina issue from it on the middle line above, and the 

 terminal mental foramen issues at the superior extremity of the distal 

 end, a little below the internal ridge on the external side of it. Of the 

 borders of the alveolar groove the internal is much lower than the 

 external on the proximal sixth of the length. The edges are then equal 

 for a short distance, and are acute. The internal then becomes the 

 more elevated, and continues so until its point of union with the ex- 

 ternal. The internal wall of the groove is at first narrow, and its 

 superior edge from being acute becomes narrowly rounded, but becomes 

 more obtuse distally as the wall becomes thicker. The internal side 

 of the ramus is very little convex. The external side of the ramus is 

 strongly convex in vertical section, hence it is that the external edge 

 of the groove becomes wider as it becomes lower, until at the beginning 

 of the distal third of the length it forms a plane distinct from the 

 convex external face. This external convexity growing rapidly less, 

 the superior edge becomes proportionally narrower, and at the ex- 

 tremity of the ramus is about as wide as the internal superior ridge. 



