368 University Geological Survey of Kansas. 



seeming to be more pronounced than in the species just men- 

 tioned, and are covered with an enamel-like substance. 



P. gigas. P. gladius.* 



Total length of fragment 49 . mm 



Width near the middle 195 .0 " 175 mm. 



Thickness, posterior, near the middle 11.5 " 12 " 



Thickness, anterior, near middle 30.0 " 



Protosphyraena, n. sp. ? 



Profosjihyrcena, sp. nov., Kans. Univ. Quart., vol. vn a. 



The material upon which this description is based consists of 

 a right premaxilla from the Niobrara Cretaceous of western 

 Kansas. Locality and collector not known. This material I 

 consider too scant to justify a specific name being given until 

 more complete specimens are found. It may prove to be the 

 premaxilla of one of the other species of Protosphyrsena that are 

 at present known only from the rostral bones and fin remains. 

 At present it will have to be considered as a new species with 

 an interrogation. It is evidently different from the premaxilla. 

 of P. nitida described by Felix. 127 



When seen from the side the bone is triangular in outline, 

 with a thin superior and posterior border. The anterior ex- 

 tremity is broken away, but it was probably acutely pointed, as 

 in P. nitida. The principal differences which characterize this 

 from the premaxilla of the species just mentioned are found in 

 the size and arrangement of the teeth. Near the center of the 

 bone there are alveoli for four large teeth, the anterior three of 

 which are almost complete, while the posterior one is, broken off 



* Measurements after Cope. Cret. Vert. West, p. 244 F. 

 127. Zeits. d. Deutsch. Geol. Ges. 1890, vol. XLII, p. 283. 



