FROM THE PHOSPHATE BEDS OF SOUTH CAROLINA. 225 



beak a short distance internally to its lateral border. Behind, an acute ridge 

 descends from the highest point of the tuberosity and curves outward and backward 

 towkds the position of the supra-orbital roof. 



The two maxillary tubercles are not quite symmetrical in size, shape, or position 

 The right one appears to have been rather the higher, and it extends further back 

 than the left one, but not so far forward. Behind the tubercles, the wide hollow 

 of the muzzle turns outwardly into a deep groove directed towards the position of 

 the supra-orbital roof. Opening into the groove is a large foramen continuous 

 with the anterior division of the infra-orbital canal, which opens behind on the 

 fractured border of the fossil. 



The broad deep hollow of the upper part of the muzzle is but feebly divided 

 by the conjunction of the intermaxillaries. These form no conspicuous rising 

 above the supra-vomerine canal such as exists in Choneziphius. Posteriorly, in 

 the prenarial region, the intermaxillaries are separated by a deep notch or wide 

 fissure terminating forward and communicating below with the back portion of 

 the supra-vomerine canal. The latter anteriorly is exposed for more than half its 

 length by the destruction of the upper fore part of the intermaxillaries. The 

 canal is elliptical in transverse section with subacute poles, and is about an inch 

 from above downward, and five-eighths of an inch transversely. 



Outside the position of the vomer, in the specimen, on each side portions of a 

 vasculo-neural canal are exposed by the breaking away of the intermaxillaries which 

 in the complete condition covered them. 



The position of the right prenarial fossa, as presented in the two species of 

 Choneziphius above described, in the fossil under consideration, is occupied^ by a 

 thick discoid plate, with an uneven surface, which reminds one of an exostosis. 



The left prenarial fossa is concave and not occupied in the manner of the 

 right fossa. It looks as if it had been dispossessed of a similar protuberance, 

 though no traces of fractures are visible indicating the actual existence of such a 



plate. 



The lateral margins of the rostrum posteriorly, converging from the position 

 of the supra-orbital processes, are acute. Anteriorly, in the specimen, they are 

 mutilated, but they exhibit evidences of having divided into a pair of less promi- 

 nent ridges proceeding forward towards the end of the beak. The wide, shallow, 

 concave surface between the ridges presents a vascular groove proceeding forward 

 from a canal in the maxillary bone. 



The estimated length of the muzzle from the nares is about twenty inches. 

 The depth or thickness of the base, just in front of the prenarial fossse, is about 



