WILLISTON : FISH TEETH FROM KANSAS CRETACEOUS. 87 



Liunna. 



Teeth, except some of the hindmost ones, with a narrow, com- 

 pressed, conical cusp, with one or two pairs of small, pointed denticles. 



Some of the following species may belong to Odontaspis, which 

 can hardly be distinguished by the teeth alone, differing only in the 

 relatively less high and less subulated character of the anterior ones, 

 and in the usually larger size of the lateral denticles. 



LaiHim (titiK'ndici(h(t((. Plate XIV, figs. 3-3c. 



Otodus npppncHcuIafits: (Roemer) Agassiz. Poiss. Foss. Ill, 279, pi. XXXII, 

 ff. 1-25; Davis, Trans. Roy. Dubl. Soc. IV, 402, pi. XLI, ff. 1-11. 



Lamnn appemdicidnfri Woodward, Cat. Foss. Fishes Brit. Mus. I. .393: 

 Proc. Geol Assoc. XIII, 196 — Senoniau, Cenoraanian, Turonian( ?),Danian 

 of Europe, Niobrara of Kansas, and Greensand of New Jersey. 



"Teeth robust, with a thick root, having a much flattened postero- 

 inferior face, the nutritive foramen not in a groove. Outer face 

 slightly convex or fiat, often with a few indefinite vertical folds on 

 the basal half; inner side of crown markedly convex, smooth ; cutting 

 edges prominent; a single pair of lateral denticles, broad, but pointed. 

 Anterior teeth narrow and upright ; lateral teeth much inclined back- 

 ward, the anterior teeth much more arcuate and longer than the pos- 

 terior ones." Woodward, I. c. 



Several teeth from the Niobrara chalk agree sufficiently well with 

 the foregoing description, and especially with Woodward's figures, to 

 permit their allocation here. They are somewhat broader than the 

 specimens figured by Woodward. Two of the specimens differ mark- 

 edly from the others in having the base flatter and the roots much 

 less prolonged downward, the notch of the base shallower and shorter. 

 Another tooth from the base of the Benton, in the conglomerate con- 

 taining the specimens of Corax curvatus and Ptyc/iodus janewayii, 

 agrees well with these last specimens and apparently belongs to the 

 same species, if distinct. Their resemblance to Odontaspis kopin- 

 gensis Davis likewise cannot be denied, but the lateral denticles are 

 more triangular in shape. 



Lannta sitlcafft. Plate VI, figs. 1-lb. 



Otodufi sulcafus Geinitz, Char. Schicht. u. Petriffact. saechs-boohm Krei- 

 deb. Nacht 5, pi. IV, f. 2. 



Otodm diraricatus Leidv, Ext. Vert. Fauna, 30.5, vol. XVIII, ff. 26-28 : Cope, 

 Cret. Vert. 295. 



Lamnn fudcata Woodward, Cat. Foss. Fishes Brit. Mus. I, 398 (where addi- 

 tional synonymy will be found); Proc. Geol. Assoc. XIII, p. 197 — Ceno- 

 manian and Turonian, England, France, Belgium, Saxony, Bohemia; 

 Senonian, England: Cretaceous, Texas, (Leidy); Jewell county, Kansas 

 (Cope); Mississippi (Cope). 



"Teeth very robust, the crown sometimes attaining a height of 

 nearly 50 mm. Outer face of crown slightly convex, generally un- 

 even ; both the inner and the outer faces with more or less prominent 



