FROM THE PHOSPHATE BEDS OF SOUTH CAROLINA. 23T 



are alone ascribed to the tertiary formations, we may suppose that the New Jersey 

 fossils belong to the upper or eocene marl bed, 



A specimen formerly described under the name of Mijliobates rugosus, repre- 

 sented in figure 10, PI. xxxi., is from New Egypt, Ocean Co., and was presented 

 to the Academy by T. A. Conrad. It consists of four unworn median teeth, the 

 first and last with one extremity lost. The triturating surface is convex both fore 

 and aft and transversely, and is wrinkled longitudinally to an unusual degree espe- 

 cially at the extremities of the teeth. The sutures of the median teeth curve 

 backward, but are not deflected from this course at the ends. 



The four teeth occupy an extent fore and aft of twenty lines. The first and 

 second of the series measure 5| lines antero-posteriorly; the last one 4i lines. 

 The second tooth is twenty-eight lines broad. The radical portions of the teeth 

 are broken away, and the bases of the crowns are nearly straight transversely. 

 The crown of the first tooth of the series is 5 lines thick at the middle, and it 

 thins away to II lines at the ends. 



A specimen represented in figures 8, 9, PI. xxxi., from Vincenttown, presented 

 to the Academy by Col. T. M. Bryan, consists of a pair of unworn median teeth. 

 These sufficiently agree with the corresponding teeth of the preceding specimen to 

 pertain to a smaller individual of the same species. They are highly polished on the 

 free surface, and present scarcely any wrinkling except near the ends. The sutural 

 borders transversely have almost the same extent of curvature as in the former 

 specimen, and the triturating surface has nearly the same degree of convexity, but 

 becomes rather more deflected at the ends so that the teeth are proportionately 

 thicker in this position. The base of the crowns is straight, and the bottom of 

 the root feebly slants from the middle laterally. 



The two teeth measure fore and aft at the middle 8 lines, and in thickness 51 

 lines. The crown of the anterior tooth is 4 lines thick at the middle and 2 lines 

 at the angular ends. 



The specimen originally referred to M. obesus, figure 44, PI. xxxiv., consists of 

 two imperfect median teeth. It was found in the marl of Pemberton, Burlington 

 Co., and was presented to the Academy by Dr. Charles H. Budd. The front tooth 

 is worn, indicating the anterior position of the specimen in the dental series. The 

 fore and aft extent of the two teeth is half an inch; the thickness is 41 lines. 



An isolated median tooth from MuUica Hill, Gloucester Co., was presented to 

 the Academy by Dr. Wm. B. Atkinson. It accords in form and size sufficiently 

 well with the imperfect teeth of the specimen just indicated to belong to the same 

 species, and to an individual of nearly the same size or age. The breadth of the 



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