MARYLAND GEOLOGICAL SURVEY 5X 



The extremity of the ramus is, in profile, truncated obliquely backwards 

 and downwards to the obtuse angle at which it meets the slight rise in 

 the outline of the inferior margin. The external plane is slightly con- 

 cave. The internal face exhibits two surfaces, a superior convex por- 

 tion which widens downwards and backwards, and an inferior wider flat 

 portion separated from the superior by a straight ledge. The inferior 

 border of the ramus is represented by an angle of about 70° for the 

 greater part of the length. Below the region where the alveolar 

 borders are equal the angle is more nearly right owing to the increased 

 convexity of the external face. It is rounded below the coronoid pro- 

 cess (which is broken off) and widens towards the angle. It is rounded 

 on the distal third, becoming narrower rapidly towards the distal 

 extremity. 



Measurements. 



Length of ramus restored ; on curve 1.900 m. 



Length of proximal fragment 79O 



Length of distal fragment 39O 



Transverse diameter near condyle 070 



Transverse diameter where alveolar borders are equal 060 



Transverse diameter at distal end of long fragment 057 



\ertical diameter where alveolar edges are equal 073 



Vertical diameter at distal end of long fragment 074 



Vertical diameter at proximal end of distal fragment . . .079 

 Transverse diameter at proximal end of distal fragment. .049 



Vertical diameter of extremity 065 



" Besides the general characters, the Ulias moratus presents various 

 specific differences from the various species of Bal^nidfe which are 

 known. The flatness of the internal face and the lack of decurvature dis- 

 tinguishes it from several of them; and the absence of fissure at the 

 distal mental foramen separates it from others. I know of no species 

 which has only one series of foramina and that one on the median line, 

 on the distal fourth, except the present one. The size of the ramus 

 resembles that of the Cetotherium palonatlanticum of Leidy, and repre- 

 sents a species of about twenty-five feet in length." Cope, 1895. 

 Occurrence. — Chesapeake Group. Maryland or Virginia. 

 Collection. — Johns Hopkins University. 



