146 DR. GIBBES' MONOGRAPH OF THE 



South Carolina, the locality whence I procured the hones of Basilosaurus, Dorudon, 

 Pristis Agassizi, Crocodilus macrorynchus, SfC. Fig. 14 belongs to the Medical 

 College of South Carolina, and is from the bank of Ashley river (Eocene.) Fig. 15 

 is from the marl of Ashley river, and was presented to me by Dr. William G. 

 Ramsay, of Charleston. 



3. C. ACUTiDENS, Gihbes. Figs. 39 to 44. — I published this new species in the 

 Proceedings of the Academy of September last, from which I take the description : 



This beautiful species resembles C. angustidens, Agassiz, but is very acutely 

 pointed. Of four specimens which are in my cabinet, the largest cone (fig. 39) 

 measures three inches, and it is more than three times the depth of the root, which is 

 concave, very thick and prominent on the inner face. The body of the tooth, or 

 enamelled portion is conical, the lower third swollen, widest next the lateral denticles, 

 which are distinct from it. The inner face is arched, while the outer is nearly flat, 

 though undulated by depressions next the edges, and having a deep furrow 

 longitudinally in the middle near the base of the enamel, which extends to the root. 

 This does not extend as low on the inner face, and is sloped, leaving an interspace 

 next the root. The cutting edges are sharp and finely indented, the serratures very 

 close. Most of my specimens are straight, (figs. 40, 43, 44,) but I have two which 

 are oblique, figs. 39, 41. All are from a locality of (Eocene) San tee limestone in 

 Orangeburg district. South Carolina, with the exception of fig. 41, which is from the 

 marl of Cooper river, sent to me by Col. John Harleston, of Elwood. 



There are several of this species in the cabinet of the Academy, labelled from New 

 Jersey, and I have a cast of a fine one found in New Jersey, by Mr. C. Barclay, of 

 Troy, New York. 



4. C. MORTONi, Gibhes. 1 have only two specimens, both broken. That which is 

 figured, (fig. 45) and of which a cast is in the collection of the Academy, was 

 probably four inches deep and three inches across the root ; the upper third is 

 wanting. It is somewhat inequilateral, the anterior edge sloped inwards, and the 

 posterior arched, both the outer and inner surfaces are convex and prominent, the 

 latter trebly so. The enamel is thin but strong, cracked in striae parallel to the 

 edges, and as in most other species converging and disappearing towards the apex : 

 it is sloped on the inner face. The cutting edges are finely indented, the dentelures 

 (if I may be allowed to adopt an expressive word from the French) are very small, 

 and more minute near the base of the enamel. Next the edges on both faces is a 

 longitudinal flattening, giving the appearance of undulations. The root is immensely 

 thick, an inch and a half, and constitutes more than half the bulk of the tooth ; it is 

 concave, but the extremities being broken, the form cannot be given ; the structure of 



