266 [Sept. 1847. 



There is in the cabinet but one remaining tooth, to which I shall refer. 

 This is an inferior middle molar of the left side, in an excellent state of pre- 

 servation, and is a beautiful specimen; the whole of the exterior cementum 

 being preserved without a fissure, apparently through the agency of oxide of 

 iron and siliceous matter, which have rendered it as hard as the dentine itself. 

 It was found with the bones of the Mastodon, Megatherium, Harlanus, &c> 

 in making the excavation for the Brunswick Canal, near Darien, Georgia, and 

 was kindly presented to the Academy by Mr. J. H. Couper. 



It is straight, and although not longer than the corresponding tooth of the 

 recent horse, with a very little increase in the diameters, character enough can- 

 not be found in it to consider it distinct from the Equus Americanus. 



References to the Figures. 



Figs. 1 and 6, and 4 and 5, were taken from the same specimens. 



Fig. 1. Crown of a superior middle molar of the left side; antero-posterior 

 measurement 1.2 in., transverse 1.1 in. 



Fig. 2. Crown of the superior posterior molar of the right side ; antero-poste- 

 rior measurement 1.3 in., transverse 1.9 in. 



Fig. 3. Do. from another specimen. 



Fig. 4. Crown of an inferior middle molar of the right side ; antero-posterior 

 measurement 1.25 in., transverse .7 in. 



Fig. 5. Internal view of an inferior middle molar of the left side; greatest 

 length 4.15 in.; depth of its curve .15 in. 



Fig. 6. Antero-lateral view of a superior middle molar of the left side; great- 

 est length 3.9 in,; depth of curve .3 in. 



The Committee on the following communication, hy Dr. 

 Gibbes, of South Carolina, reported in favour of publication 

 in the Proceedings. 



Description of new species of Squalides from the Tertiary Beds of South Carolina. 

 By Robert W. Gibbes, M. D., Columbia, S. C. 



1. Cab.char.odon Mortoni. I have only two specimens from the Eocene, 

 both broken. That, of which a cast is in the collection of the Academy, 

 was probably four inches deep, and three inches across the roots; the upper 

 third is wanting. It is somewhat inequilateral the anterior edge sloped in- 

 wards, and the posterior arched both the outer and inner surfaces are con- 

 vex 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 flat- 

 tening, giving the appearance of undulations. The root is immensely thick, 

 an inch and a half, and constitutes more than half of the bulk of the tooth. 

 The root is concave, but the extremities being broken, the form cannot be 



