230 DESCRIPTION OF VERTEBRATE REMAINS, CHIEFLY 



as in ProrozipMus macrops, but is more prominent above just behind the position 

 of the supra-vomerine canal. In the specimen this portion of the beak exhibits 

 a remarkably eroded appearance, due to the tunnelling of boring mollusks. One 

 of the tunnels makes a communication with the supra-vomerine canal just back 

 of its exposed portion. 



The back portion of the beak, in advance of the interorbital region is triangu- 

 larly prismoid nearly as in Prorosiphius macrops, but the upper surface is not 

 quite so even. Along the middle, over the position of the conjoined and com- 

 pletely co-ossified intermaxillaries, it is slightly depressed, the depression narrowing 

 forward and ceasing at the median most prominent portion of the beak. On each 

 side of the depressed surface a narrow vascular groove extends forward from a 

 canal opening from the interior of the beak. 



The sides of the beak are defined from the inclined palatine surface by a ridge 

 becoming obsolete anteriorly. A pair of vascular grooves extend along the ridge, 

 and beneath its position extending all the way to the end of the beak there is a 

 narrow groove which looks as if it might be the homologue of the alveolar groove 

 in the Porpoises. The trace of a similar groove is observable at the fore part of 

 the beak of P. macrops, which would have escaped attention had its much better 

 developed condition not been observed in this. 



The right prenarial fossa, preserved in the specimen, is a deep, wide, half funnel- 

 like concavity, not prolonged forward in a groove as in Proroziphius macrops, 

 Choneziphius, and others, but at once converging into a canal penetrating the beak. 



The expansion formed by the conjoined intermaxillaries between the prenarial 

 fossEe does not become so narrowed in its extension backward to the nares as in 

 Proroziphius macrops, nor is this extension cleft as in the latter. In Proroziphius 

 macrops the cleft just alluded to communicates beneath with the back part of the 

 supra-vomerine canal, but in the beak under description there is no such opening. 

 The supra-orbital fossa of the right side, as seen in the specimen, presents no 



special peculiarity. 



The length of the beak in the median line from the narial partition to the end 

 is nineteen inches. The width of the beak near the middle is three and one-half 

 inches, and the depth or height in the same position has been about the same 



measurement. 



CETERHINOPS. 



Ceterhinops longifrons. 



A fragment of the skull of a Cetacean, from the Ashley River phosphate beds, 



in the collection of the Academy, represented in figure 7, PI. xxxiv., one-half the 



