250 University Geological Survey of Kansas. 



Lamna, sp. Plate XXX, fig. 6. 

 Lamna, sp., Williston, cf. cit. 39. 



A somewhat injured tooth, of larger size than the last, dif- 

 fers in having a larger and stouter base, the inner projection 

 in the middle of the latter stouter and broader, and the lateral 

 denticles smaller and more obtuse. Height of tooth (approxi- 

 mately) , 32 mm. ; width of base of crown, 12 mm. ; width of 

 base of tooth, 25 mm. 



One specimen, Kiowa shales, Clark county. 



Lamna quinquelateralis. 



Lamna quinquelateralis Cragin, Colo. Coll. Studies, v, p. 189; Williston, 

 cf. cit. 39. 



"The specific name quinquelateralis is applied to a species of 

 shark whose vertebrae differ from all others of which I have any 

 knowledge. The type vertebra is short, much broader than 

 high, shallow-cupped, and more or less sharply pentagonal 

 ended. 



" Measurements : Height, 20 mm. ; length, 12 mm. ; breadth, 

 12 mm. The two upper angles measure each about 130 deg. ; 

 either lateral angles about 105 deg. ; the lower angle is broad 

 and rounded. 



' ' Occurrence : A single vertebra of this form was found by 

 the writer at Belvidere, Kan., with the above-described remains 

 of Plesiochelys, in the upper part of No. 4 of the Belvidere sec- 

 tion." 



Possibly this vertebra belongs with one or the other of the 

 above-described teeth from these same deposits, but the corre- 

 lation cannot be made until the teeth and vertebrae are found 

 associated, which may be long hence. 



Scapanorhynchus. 



Rhinognathus Davis, Trans. Roy. Dubl. Soc. (2), in, p. 480. 

 Scapanorhynchus Woodward, Cat. Foss. Fishes Brit. Mus., i, p. 351, (1889). 

 ? Mitsukurina Jordan, Proc. Calif. Acad. Sci. Zool., i, (1898); Amer. Nat., 

 xxxiv, p. 234. 



The genus Scapanorhynchus , first proposed by Davis under a 



preoccupied name, has been more closely defined by Woodward. 



The teeth themselves cannot in many cases be generically dis- 



