CEEODONTA. 279 



dentition, with several fragments of the posterior part of the skull, with 

 parts of both mandibular rami suppoi'ting several teeth, with parts of hume- 

 rus and ulna. These specimens show that the Deltatherium fundaminis and 

 Lipodectes penetrans are one and the same species. Besides this, there are 

 separate mandibles of two other individuals, making five in all. 



In the first-named specimen the second premolar is convex on the inner 

 face; the base of the third is a nearly equilateral triangle. The bases of 

 the true molars are triangles, with bases external. The internal angle sup- 

 ports an acute cusp, and has a posterior basal cingulum, which is very strong 

 in the last three molars. The two external cusps of the first and second 

 molars are situated well within the base, which is folded into a strong cin- 

 gulum. This cingulum develops strong anterior and posterior angles. This 

 is the largest species of the family yet discovered. 



Measurements. 



Extent of series of last six molars 045 



Extent of series of true molars "26 



Diameters of fourth premolar? f eropo 



c transverse uu/o- 



^. ^ . , . , (anteroposterior 0087 



Diameters of second true molar <; .,„f. 



( transverse uiui; 



The type specimen of the Lipodectes penetrans is a left mandibular 

 ramus, with three of the molars preserved The last has a long heel ; the 

 first and second true molars are alike, and resemble those of Tritsodon, but 

 the appendicular cusps are better developed. The anterior inner cusp is, 

 however, smaller than the others and is nearly median in position. The 

 heel is elevated on its external border into a strong triangular cusp. The 

 posterior border rises into an acute cusp, which is internal to the middle line. 

 The internal border of the heel is not elevated, and the surface is the oblique 

 inner face of the external cusp. The anterior cusps are only moderately 

 elevated and the cusps are acute. The enamel is smooth, and there is a low 

 cingulum on the external base. The first (second) premolar is two-rooted, 

 and has a large base. The second (third) consists principally of an elevated 

 cusp with a subtriangular section. The heel is very small and acute, and 

 there is no anterior basal tubercle. The internal face is strongly grooved 

 in front. Canines directed upwards, with robust base. Symphysis short. 

 Length of molar series, .043; of premolars, .019; of diastema, .012; length 



