FROM THE PHOSPHATE BEDS OF SOUTH CAROLINA. 229 



unsymmetrical expansion like that of the posterior part of the intermaxillary crest 

 in the rostra attributed to Choneziphius. The surface of this expansion is depressed 

 except where it contracts into the ridges bounding the anterior nasal notch. 



The end of the beak exhibits on the right side a series of four foramina, the 

 exit of neuro- vascular canals for the passage of maxillary vessels and nerves to the 

 lip and gum. On the left side there are only two of the same kind of foramina. 



The supra-vomerine canal where exposed at the end of the beak is ovate in 

 section, acute below and obtuse above. It is over an inch vertically, and about 

 five-eigfhths of an inch in width. 



In the upper view of the beak, fig. 1, the sides at first converge in a curvi- 

 linear manner from the preorbital notches, then extend nearly parallel forward to 

 about the middle, when they converge to the rounded point. At the middle, the 

 beak is actually slightly wider than it is some distance back of this position. 



In the lateral view of the specimen, fig, 2, at the upper part of the beak, the 

 median line of the base barely projects above the lateral subacute border, and only 

 becomes more prominent as the acute ridge formed by the lateral border descends 

 forward and disappears. The inferior outline proceeds nearly straight forward in 

 advance of the middle and then curves upward to the end of the beak. 



The palatine surface posteriorly slopes on each side to a prominent acute carina 

 largely formed by a triangular projection of the vomer. In advance of this it 

 slopes from a median convex ridge, and in front is linguiform. 



The rostrum at its middle is 4^^^ inches wide and 31 deep; at its anterior 



fourth is 3| wide and 3 deep; at its posterior three-fourths is 4i wide and about 



3 J deep. 



Proroziphius chonops. 



Another specimen of the beak of a Ziphioid Cetacean, which I observed among 

 a collection of other fossils and phosphatic materials, on exhibition in the Agri- 

 cultural Department of the Government, from the Ashley beds, worked by the 

 Wando Mining Company, was kindly loaned to me by Mr. H. Amidon. 



The beak represented in figs. 3, 4, PI. xxxii., indicates a species different from 

 any of the foregoing, but appears to be sufficiently like that of Proroziphius macrops 

 to belong to the same genus. It has nearly the same form as the specimen ascribed 

 to the latter, but is about one-fourth less in length and is proportionately broader. 

 As in all the other beaks described, the constituent bones are completely co-ossified, 

 while from the non-ossification of the mesethmoid cartilage the supra-vomerine 

 canal remains open and is exposed for about three inches at the end of the beak. 



The anterior extremity, comprising nearly half the length of the beak, is conical, 



57 



