54 CRETACEOUS AND TERTIARY FISH. 



All the species, of which about 38 have been described, are ex- 

 tinct. 



Otodus app£ndicui,atus Agassiz. 



Otodus appendiculatus Gibbes, Journ. Acad. Nat. Sci. Phila., (2) I, August, 

 1849, p. 199. (New Jersey Greensand.) 



Cope, Proc. Amer. Philos. Soc. Phila., XIV, 1875, p. 362. (Cumberland 

 Co. Miocene.) 



Cope, Rep. U. S. Geol. Surv. Terr. Hayden, II, 1875, P- 295. (Green- 

 sand No. 5, N. J.) 



Teeth robust, thickened and moderately compressed. Coronal 

 surface slightly compressed, usually low or but moderately at- 

 tenuated and sharply pointed. Outer face usually more or less 

 flattened, or but slightly convex and smooth, sometimes a little 

 concave basally, but without any vertical wrinkles. Inner coronal 

 face usually well convex, rather prominently so basally, and 

 smooth. Apex slightly deflected or erect. Cutting-edges trench- 

 ant, sharp, entire. Usually one large basal cusp on one or each 

 side, sometimes two. These cusps vary from broad till quite 

 slender, and are always sharply pointed and with entire cutting- 

 edges. Root robust, thick, outer face usually flattened and inner 

 face swelling in a large convexity. In profile lower margin vary- 

 ing rather widelv crescentic, and ends sometimes flaring a little. 

 Length to 36 mlm. 



This species seems to differ from Otodus lanceolatus chiefly in 

 its smaller size. According to Woodward the anterior teeth are- 

 erect and slender, and the lateral teeth well inclined back, their 

 front edges being more arcuate and longer than the hind ones. 

 He further says that the thick root has the nutrative foramen not 

 in a groove, and the outer coronal face has often a few indefinite 

 vertical folds on its basal half. 



Formation and locality. I have examined a number of de- 

 tached teeth from the Cretaceous formations. They are : "New 

 Jersey" 2 (T. A. Conrad), 1 (Burtt), 2 (W. M. Gabb), 1 with- 

 out donor, 3 (C. C. Abbott) ; Monmouth County 1 (W. 

 Cleburne), 3 (P. D. Knieskern and Cleburne), 3 (Abbott) ; 

 Shark River 1 (Knieskern) ; Long Branch 4 (H. C. Chapman) ; 

 Burlington County 4 (C. Budd) ; Crosswicks 1 (Conrad) ; Vin- 



