WILLISTON : FISH TEETH FROM KANSAS C^RETACEOUS. 39 



Lamna appendiculata, but the denticles are stouter (comiDare Wood- 

 ward, Proc. Geol. Assoc. XIII, pi. VI, f. 26). Height of crown, 15 

 mm.; width of base, 18 mm.; width of base of crown, 9 mm.; distance 

 between points of denticles, 14 mm. 



Lfinnid, sp. Plate XII, fig. 6. 



A somewhat injured tooth, of larger size than the last, differs 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 (approximately), 32 mm. ; width of base 

 of crown, 12 mm.; width of base of tooth, 25 mm. 



One specimen, Ki^wa shales, Clark county. 



La in n «i ([ n in 7 ncln ferttfis, 



Lamna quhiquelaternlis Cragin, Colorado College Studies, V, 189. 



"The specific name qriinquelateralis is applied to a species of 

 shark whose vertabraj ditfer 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 lat- 

 eral 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 Ple- 

 siochelys, in the upper part of No. 4 of the Belvidere section." 



Probably this vertebra belongs with one or the other of the above- 

 described teeth from these same deposits, but the correlation cannot 

 be made until the teeth and vertebrae are found associated, which 



may be long hence. 



Sr(fjt(tn orit t/ii cIi us. 



Rhinognafhits Davis, Trans. Roy. Dubl. Soe. (2) III, 480. 

 Scopanorhijnchus Woodward, Cat. Foss. Fishes Brit. Mus. I, 351, 1889. 

 / Mitsukurinn Jordan, Proc. Calif. Acad. Sci. Zool. I, 1898; Amer. Natur- 

 alist, XXXIV, 234. 



The genus Scapanorhynchus, first proposed by Davis under a pre- 

 occupied name, has been more closelj' defined by Woodward. The 

 teeth themselves cannot in many cases be generically distinguished 

 from those of Odontaspis, under which name some were originally 

 described. 



Recently Doctor Woodward* has identified a modern genus of 

 sharks, from the deep sea off Yokahama, Japan, with this supposedly 

 extinct type — Mitsiikurina Jordan. 



Possibly the i:)ositive identification is premature, but there seems 

 to be no doubt of the close relationship of the two forms, at least. 



* Am. Mas. Nat. Hist. Ill, 487 ( 1899). 



