232 DESCRIPTION OF VERTEBRATE REMAINS, CHIEFLY 



latter appear to be about of the same proportionate extent, direction, and symmetry 

 as in the Porpoises. 



The co-ossified maxillaries in advance of the lower orifices of the nasal passages 

 form a strong convex prominence, sloping off anteriorly and laterally. No portion 

 of the maxillaries in the specimen contains portions of alveoli for teeth. 



EUPACHEMYS. 



EUPACHEMYS OBTUStFS. 



Remains of turtles are not unfrequent in the Ashley phosphate beds, usually 

 consisting of fragments of the osseous shells, and mostly so small as to yield un- 

 satisfactory results in the determination of the genera and species. 



Fragments of the shell apparently of two species of land turtles, one of large 

 size, are indicated and figured in Holmes' Postpliocene Fossils of South Carolina. 



The museum of the Academy contains fragments of costal plates of a large 

 species of turtle from the vicinity of Beaufort, S. C. 



Prof. Holmes has submitted to my examination a specimen, probably pertaining 

 to the same species as the latter, from the Ashley River, in the vicinity of Charles- 

 ton. It consists of a marginal bone, represented in figures 4, 5, PI. xxxiv., half 

 the natural size. I have not had sufficient time and opportunity to determine 

 positively the exact position of the bone in the carapace, but it appears to agree 

 nearest with the eighth of the left side in an Emys. The bone is also sufficiently 

 peculiar to have made me uncertain in determining the upper and under surfaces. 

 What appears to me to be the upper surface, fig. 4, rises in a prominent fore and 

 aft ridge just outside of the middle. The inner division of the surface is trans- 

 versely concave; the outer forms a sloping plane to the external obtuse margin of 

 the bone. The under surface transversely forms a single long convex sweep from 

 the inner to the outer margin of the bone. Fore and aft it is feebly concave. 



The posterior sutural surface, fig. 5, exhibits the outlines of the upper and 

 under surfaces. 



The upper surface of the bone is not smooth, and is even rough and somewhat 

 eroded on the outer division. It exhibits no distinct trace of grooves defining the 

 position of scutes. The under surface of the bone is smooth, and exhibits near 

 the inner border a fore and aft furrow, and near the middle a more feebly developed 

 one, defining marginal scutes. 



The length of the posterior sutural surface of the bone is a little over five 

 inches; the thickness is three inches. The fore and aft extent of the upper surface 

 is four and three-quarters inches. 



