254 [June, 1S45. 



extending- from the mouth nearly to the margin ; vent oblong- 

 transverse, near the margin. 



This is a recent species obtained by the dredge at sea, in about 

 1 4 fathoms, off Charleston, South Carolina. It is probably abun- 

 dant, although but few specimens were brought ashore. It is re- 

 markable for its size, and for its dorsal convexity and thick margin. 



The Committee to whom was referred the following paper, 

 read at last meeting, by Dr. R. W. Gibbes, of Columbia, S. C, 

 reported in favour of publication. 



Description of the Teeth of a new Fossil Animal found in the Green Sand of 

 South Carolina. 



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



DoRUDON SERRATUS. 



Teeth spear-shaped, serrated, in distinct deep sockets with double- fangs, the 

 bifurcation commencing a half inch below the enamel, which extends from the 

 point of the tooth one inch ; enamel striated ; the serris longitudinal, diminish- 

 ing in size from the apex of the tooth, which is f of an inch from the first la- 

 teral point; length of the tooth 3^ inches; breadth 2| inches; thickness of the 

 body below the enamel a half inch ; the anterior root a cone compressed 

 laterally, the other prismalic, thicker on the posterior side, which is fluted 

 so as to present the appearance of being partially divided into two fangs. 

 Where the fangs are united the neck is contracted, so that a horizontal section 

 presents the yoke shape of the tooth of the Zeuglodon of Owen ; in one of the 

 teeth the distance from the extremities of the fangs across is 2^ inches. 



The teeth and fragments of a maxillary bone here described, were found in 

 March last, in a bed of Green sand near the Santee Canal, in South Carolina. 

 The locality is on the plantation of R, W. Mazyck, Esq., about three miles 

 from the entrance of the canal from the head waters of Cooper river. The de- 

 posite of Green sand is from four to eight feet thick near the surface, lying on a 

 solid yellowish limestone containing casts of Cardita Planicosta, (Sow.,) and 

 Pecten Mortoni, (Ravenel,) which, according to the opinions of Lyell and 

 Conrad, would refer it to the Eocene period. Casts of C. planicosta are found 

 in the Green sand, which seems, therefore, to belong to the Tertiary formation. 

 Conrati makes the following remarks, in his communication on "the Tertiary" 

 addressed to the National Institution. 



" In many localities of the former period (tertiary,) the green sand is quite 

 as abundant as in the fossiliferous < marls' of New Jersey." In this deposite is 

 found, in great abundance, Gryphoea mutabilis, also Pecten membranosus, 

 P. calvalus, Scutella crusluloides, S. Rogcrsii, Solarium ? Plagiostoma gre- 

 galc, Anomia jugosa, Teredo tibialis, Scalar ia Sillimani? Casts of a large 



