216 DESCRIPTION OF YERTEBUATE REMAINS, CHIEFLY 



Walrus is, however, subject to variation, and cannot, as far as relates to the condition 

 observed in the fossil, be considered of specific value. Variation in the exact 

 arrangement of the fluting is exhibited in the tusks of the Sable Island skull above 

 mentioned, and in those of a skull found in Monmouth Co., New Jersey, also 

 contained in the collection of the Academy. 



AVhile we cannot consider the characters presented by the fossil tusk as of 

 sufficient value to determine positively whether it pertained to a species of Walrus 

 distinct from the living one, it is an interesting fact to have learned that this or a 

 closely related species formerly existed so far south as the Ashley River, South 

 Carolina. 



The length of the tusk following the curve externally is 13 inches; near the 

 root fore and aft it measures 3t inches, and transversely II inches; at the middle 

 about the same fore and aft, and 21 inches transversely. 



DINOZIPHIUS. 



DiNOZIPHIUS CAROLINENSIS. 



Teeth not differing from those of the recent Sperm Whale have been discovered 

 in the Ashley phosphate beds. Two such teeth are indicated and described in 

 Holmes' Post-pliocene Fossils of South Carolina, In the Ashley collection of 

 fossils of the Pacific Guano Co. there is a large tooth, which from its form I infer 

 to have belonged to a species diff"erent from the recent one, and it is not improbable 

 that it may have pertained to a huge Ziphioid Cetacean. 



The specimen represented in figure 6, PI. xxxiv., one-half the size of the origi- 

 nal, is black, dense, heavy, and brittle, but not petrified; and it has the same 

 structure as the teeth of the Sperm Whale. It is fusiform with only slight 

 lateral compression, and is nearly straight or feebly curved. It is most robust 

 at the upper third or crown, and is in this position blunt, conical, and devoid of 

 any trace of enamel. The fang is an elongate cone with a small funnel-shaped 

 pulp cavity at the apex less than an inch in depth. 



In size and form the specimen resembles certain large teeth from the Antwerp 

 crag, such as are represented in the magnificent " Osteographie des Cetaces" of Van 

 Beneden and Gervais, PI. xx., figs. 29-32, under the names of Dinoziphius Raem- 

 dorhii and JEucetes amhliodon, which Prof. Gervais regards as the same. As the 

 animal to which the Ashley fossil tooth pertained lived in the same ocean and may 

 have been contemporary with those animals to which the Antwerp crag teeth 

 belonged, it is not improbable that all were of the same species. 



The length of the tooth is 8| inches; its greatest diameter, three inches from 

 the summit, is 3^^ inches, and the lesser diameter in the same position is 2| inches. 



