Williston.] Cretaceous Fishes. 249 



ant, projecting horizontally beyond the convex side, and flat 

 or truncate below the protuberance. The enamel is entirely 

 smooth. Length, 14 mm." 



This species is unknown to me, or unrecognizable from the 

 description and figures of the mutilated type specimens. 



Lamna macrorhiza. 



Lamna macrorhiza Cope, Cret. Vert., p. 297, pi. xlii, ff. 9,10: Woodward, 

 Cat. Foss. Fishes, Brit. Mus., i, p. 399; Williston, cf cit. 38 — Niobrara of 

 Kansas: Albian, of England; Cenonian, of S. E. Russia i Woodward). 



"Teeth of small size, elevated though robust, the maximum 

 total height being about 25 mm. Outer coronal face fiat, or 

 nearly so, with a faint median longitudinal elevation, and 

 often a few folds at the base ; inner coronal face very convex, 

 smooth ; cutting edges sharp ; a single pair of relatively large, 

 narrow, acuminate lateral denticles, divergent, also often 

 marked at the base by minute vertical folds ; root with a 

 prominent inward projection below the base of the crown ; 

 nutritive foramen in a groove." 



The above description by Woodward is drawn from a Euro- 

 pean specimen, while the type described and figured by Cope 

 i- from Ellis county, Kansas, probably Niobrara. I do not 

 know the species. 



Lamna (Odontaspis? I, sp. Plate XXX, fig. 5. 



Lamna [Odontaspis f), sp., Williston, cf. eit. 38. 



A single tooth from the Lower Cretaceous ( Kiowa shales, 

 Clark county ), resembles the figure of Odontaspis kopingensis 

 Davis, as figured by that author'' except that it is smaller and 

 has the base rather more prominent, more triangular, and more 

 pointed. The tooth has also resemblance to Lamna appendiculata, 

 but the denticles are stouter (compare Woodward.) 1 " Height 

 of crown, 15 mm. ; width of base, 18 mm. ; width of base of 

 crown, mm. ; distance between points of denticles, 14 mm. 



9. Tran?. Roy. Dubl. Soc. IV, XXXVI, BgS. 27, 28. 

 10. Proc. QeoL Assoc. XIII, pi. VI, fig. 26. 



