FROM THE PHOSPHATE BEDS OF SOUTH CAROLINA. 217 



CETACEAN TEETH. 



A specimen of a tooth resembling those of the Sperm Whale, represented in 

 fitrure 7, PI. XXX., was derived from the Ashley phosphate beds. It is nearly com- 

 plete, except at the lower extremity, where it exhibits the summit of a conical 

 pulp cavity. It is slightly curved, slightly compressed cylindroid below, and blunt 

 conical at the free end. It is furnished with a thin layer of cementum, through 

 which the dentine protrudes at the end of the crown. In portions deprived of 

 the cementum the circular lines of growth of the dentine are quite obvious. In 

 its present condition the tooth is about 4| inches long ; its greatest diameter below 

 is 16 lines; its shorter diameter in the same position, 15 lines. 



Another specimen, represented in figure 8, PI. xxx., from the same beds, in its 

 complete state, was a little larger than the former. The fang is solid to the 

 broken extremity, and the end of the crown was worn all around into a cone with 

 the apex directed inwardly. The tooth appears nearly straight and cylindric 

 throughout the greater part of its length. The cementum is broken away, except 

 a portion internally, where it is 2| lines thick. The exposed dentine conspicuously 

 exhibits the circular lines of growth. The specimen in its present condition is 81 

 inches long. 



A small tooth, represented in figure 9, PI. xxx., from the Ashley beds, is black, 

 dense, and lustrous. It has the end of the fang and crown broken ofi", and is 

 smooth and water-worn, which the former specimens appear not to be to any 

 marked degree. The tooth is oblique in its axis instead of appearing curved. 

 The fang is rounded trilateral, and exhibits thick circular strise of growth. The 

 crown is conical and defined from the root. Its surface is smooth, shining, and 

 feebly striate longitudinally, and it has an indistinct appearance of being invested 

 with a thin enamel layer, though I have been unable to determine positively whe- 

 ther such exists. The specimen in its present state is li inches long; the diame- 

 ters at the base of the crown are 8 and 7 lines. 



This tooth bears some resemblance to one from the Eed Crag of Suffolk, Eng- 

 land, represented in fig. 23, in a paper of Prof. Owen, in the Quarterly Journal of 

 the Geological Society of London for 1856. The Red Crag tooth is referred by 

 Prof Owen to a Grampus, Phoccena. 



A mutilated Cetacean tooth, represented in figure 10,- PI. xxx., is from the 



miocene marl of Nash Co., North Carolina, and was presented to the Academy by 



Dr. O. D. Coppedge. It is curved cylindroid, with the root flattened on the 



inner side. The crown has had a cap of its dentine broken away, and in its present 



55 



