244 DESCRIPTION OF VERTEBRATE REMAINS, CHIEFLY 



Another specimen is a fragment from the anterior worn part of a dental pave- 

 ment, comprising portions of four median teeth with the contiguous two rows of 

 smaller ones of one side. The triturating surface is worn concavely forward, and 

 is convex on the position of the small teeth. The median teeth and intervening 

 transverse sutures are as straight as in the former specimen, but the teeth are 

 not so wide fore and aft. The lateral teeth of the specimen apparently indicate 

 two rows to render the sides of the plate complete. 



MeSOBATIS EXIMIUS. 



^tobatis eximius, Leidy: Proceedings Academy Natural Sciences, 1855, 396. 



This species was originally indicated from the specimen represented in figure 

 12, Plate xxxi. It was obtained by the late Capt. A. H. Bowman, from the sands 

 of Ashley River, S. C, and is supposed to have been derived from the eocene for- 

 mation. The specimen consists of little more than half of four median teeth with 

 the lateral teeth. The triturating surface is nearly flat, but rounded at the border, 

 and is feebly wrinkled longitudinally. The transverse sutures the greater part of 

 their course are nearly straight, but curve backward approaching the ends, and 

 they exhibit the slightest posterior inflection at the middle. 



The lateral teeth formed but a single row, occupying the angular notches 

 between the ends of the median teeth. Their outer border is fore and aft convex. 

 The bottom of the roots forms a flat surface slightly sloping from the median line. 

 The estimated breadth of the dental pavement is scarcely two inches; the fore and 

 aft extent of the four median teeth is thirteen lines. The breadth of the median 

 teeth is 22 lines; the fore and aft width, 31 lines; the thickness at the middle, 4 

 lines. The crowns are 2| lines thick at the middle and thin outwardly to nothing 

 at the angular ends. The lateral teeth are 3 lines long and l^ lines broad. 



^TOBATIS PESSPICUUS. 



Leidy: Proceedings Academy Natural Sciences, 1855, 396. 



This species was first indicated in 1855, by the fragment of a tooth represented 

 in fi-ure 13, Plate xxxi. The specimen was found in Monmouth Co., New Jersey, 

 and was presented to the Academy by Dr. J. L. Burtt. No other specimen which 

 can be attributed to the same species has been brought to my notice. Though 

 considered to belong to the upper dental pavement, I am not satisfied that such is 

 its correct position. Taking, however, this view of it, the transverse borders 

 extend relatively further forward than in the recent Mobatis narinari. 



The triturating surface is flat, and the end only slightly rounded. The ename- 



