1883.] NATURAL SCIENCES OF PHILADELPHIA. 53 



Two end-sides of the diamond which present anteriorly, are shorter 

 and more divergent than the posterior two. The latter encloses 

 a wedge-shaped space, with an obtuse apex. Thus the posterior 

 edge of the tooth is narrow and rounded. Of the anterior lateral 

 angles the external is the more prominent. The tusk is gently 

 curved outwards, and the posterior lateral face is also concave in 

 anteroposterior section. The pulp cavity enters the crown for 

 two-fifths of its length. The latter is composed of uniform dentine, 

 and there lare no traces of cemeutuni or enamel. There are trans- 

 verse bands of several delicate rugas each, separated b}'^ considerable 

 spaces. I count eleven from apex to base. The tooth is also 

 obsoletely longitudinall}' striate, but cannot be called sulcate on 

 the external face. On the internal face the longitudinal concave 

 face is divided into a narrower and wider portion by a longitudinal 

 ridge which marks the middle of the shaft. The triturating surface 

 is narrow, and presents obliquely backwards. The projection of 

 the crown bej'ond the alveolar border is not more than one-fourth 

 the total length of the tooth. 



The second incisor tooth is lost. Its alveolus shows that its 

 form was less compressed than that of the first. While its size is 

 considerable, it is evidently less developed than the first. Its 

 anterior border slightly overlaps the i)osterior narrow edge of the 

 anterior tooth. 



Jleasurevients. M. 



Vertical depth of premaxillary at septum between 



I. 1, and I. 2, -128 



Length of ditto at middle of side, . . . . "118 



Length of symphysis, . . . . . . •126 



Length of first incisor. ...... -176 



( anteroposterior, . . . -050 



Diameters do. at base ( anteriorly, . -027 



I transverse - •" 



'^ (posteriorly, . -Oil 



T^- - 1 . no (anteroposterior, . . . -037 

 Diameters do. at "02 i ' ' 



^ ) . 1 anteriorly, . '020 



m. irom apex, J transverse J^ -J 



' ( posteriorly', . -007 



Projection of do. beyond alveolus (about), . , -053 



Transverse diameter of alveolus of I. 2, anteriorly, -025 



This species may be called Dioplotherium manigaulti. in honor 

 of Mr. Manigault, to whom the University of Soutli Carolina 

 owes the present admirable condition of its Museum. The typical 



