NORTH-CAROLINA GEOLOGICAL SURVEY. 



217 



part of a femur to match both the plates and tooth, and all 

 from the miocene or shell marl. The materials, however, for 

 drawing np a proper description of this saurian, do not exist 

 at present. 



MOSSOSAURUS. 



Tooth sharp pointed, pyramidal and curved backwards ; 

 enamel moderately and finely wrinkled ; surface divided into 

 two unequal parts by well defined and finely serrate carinae, 

 the anterior of which is considerably curved on the last half 

 inch, which forms the apex. Base of the outer surface smooth, 

 and forming the segment of a large circle ; this smooth 

 band is usually covered with a thin enamel, and is a little over 

 a line wide. The rest of the outer surface is divided by three 

 ridges, the middle is strong, and extends to the point ; the an- 

 terior dies out about half an inch from the apex ; the posterior 

 is inconsiderable, and extends a little more than half way to 



the apex ; these ridges divide the surface 



towards the base 



into three slight- 



ly concave surfaces. 



The inferior has 



eight distinct ridges 



none of which reach 



the apex ; these di- 



vide this strongly convex face into nine 



slightly concave facets, of which those ad- 



jacent to the carinae are the widest, (Fig. 



36, A.) side view, natural size, (Fig. 37,) 



viewed from the point, showing the di- 



vision into parts and its polygonal form. 

 Ifc-is possible this tooth may differ from 



others which have been described. It 



differs from the one described by Dr. 

 DeKay* in being finely rugose, and distinctly serrate, neither 

 does he speak of angularities, though they are faintly indi- 



. 36. (A.) 



FIG. 37. 



* Annals of the Lyceum of N. Y., vol. 3, p. 186. 



