SQUALID2E. — Leidy. 119 



Genus, XIPHIAS.-Linn. 



XIPHIAS ROBUST US. 

 Plate XXVII. Pigs. 3-5. 



Remains of an extinct species of Sword-fish, are frequent in the Eocene formations of 

 South Carolina, to which the above name has been given. The anterior extremity of the 

 mouth of this species is represented in figure 5, Plate XXVII. Small fragments of jaws, 

 apparently of the same species, as represented in figures 3 and 4 of the above plate, have 

 likewise occasionally been found in the Post-Pleiocene beds of the Ashley river. 



Plate XXVII. Figs. 3 and 4, Fragments of Xiphias robustus, Leidy. 

 " 5, Extremity of the upper jaw from the Eocene. 



Locality. Ashley beds. Museum, College of Charleston. 



enus, P ASTINAC A. — Cu v. 



PASTINACA HASTATA? 

 Plate XXVII. Figs. 1, 2. 



Remains of a Sting-ray, consisting of the fragment of a spine, and a pair of co-ossified 

 vertebrae were found in the Post-Pleiocene deposit of Simmon's Yonges Island. 



Family, SQUALID^. 



The sharks are represented in the collection of Pleiocene and Post-pleiocene fossils, by 

 a dozen specimens of teeth, apparently belonging to five different species, but they are 

 suspected by the writer to appertain to the Eocene period. 



Two of the teeth, the largest specimen of the collection, of which one is represented in 

 figures 1, 2, of Plate XXVI, have the form of the anterior-superior teeth of certain existing 

 species of Carcharias, but appear to be solid as in the genus Carcharodon. The crown is 

 moderately thick and straight, with the lateral borders equally curved and coarsely den- 

 ticulate. The enamel is smooth, and there are no lateral cusps. The inner surface of the 

 root slopes outwardly, and presents at its middle a vascular foramen. The points of the 

 roots are bent outwardly; and the intervening surface externally is concave. 

 31 



