0. P. Hay — Species of Saurocephalxts. 303 



don phlebotomus. Mandible and maxilla are shown. Measure- 

 ments show that the maxilla, without the premaxillary, is 

 nearly as long as the alveolar border of the mandible, so that 

 it is almost certain that in this species there was no projection 

 of the dentary beyond the snout. It seems probable therefore 

 that Saurodon must be abandoned. 



I present here (fig. 5) the right maxilla and the premaxillary 

 (fig. 4) of another species of Saurocephalus, wmich I regard as 

 yet undescribed. It is especially distinguished from described 

 species by its elongated maxillary bone. To illustrate this, I 

 compare it with Mr. Stewart's S. dentatus, which is itself a 

 species with a rather long maxilla. In S. dentatus the total 



length of the "maxilla is 142 mm , its height at the palatine con- 

 dyle 48*5 mm . My specimen has the same height at the condyle ; 

 but the total length is 172 ram , a difference of' 30 mm , equal to 21 

 per cent of the shorter maxilla. My species, therefore, prob- 

 ably had a relatively slender head and a larger mouth than had 

 S. dentatus. 



In the maxilla figured I count alveoli for thirty-seven teeth ; 

 but in the maxilla of the other side, somewhat broken, the 

 teeth extend backward somewhat farther ; so that there must 

 have been forty. At some time in the career of its owner the 

 right maxilla has been fractured obliquely across its middle, 

 and this accident has affected the neighboring teeth. One of 

 these has thus become exposed nearly half-way to the tip of 

 the fang. This exposure reveals the fact that the fang is 

 faceted, as it is in B. lanoiformis. The great length of the 

 maxilla distinguishes this species from both S. lanciformis and 

 8. dentatus, and the facets on the teeth distinguish it from 

 Oope's B. arapahovius. Mr. Stewart has not described the 

 condition of the fang of the teeth of his S. dentatus. 



In fig. 5 p. o represents the palatine condyle ; p. c\ the 

 anterior palatine condyle which was applied to a surface like 

 that shown in figure 3 at mx. 



I propose to call the fish above described Saurocephahcs 

 pamphagus.* 



* Inde ruunt alii rapida velocius aura, 



Pamphagus et 



Ovid, Met, Bk. iii, 1. 209. 



