60 CRETACEOUS AND TERTIARY FISH. 



Squalus sp. Morton, Syn. Org. Rem. Cret. U. S., 1834, p. 16, PL 12, fig. 4. 



New Jersey. 

 Carcharias megalotis (Agassiz) Morton, Am. Journ. Sci. Art., XXVIII, 1835, 



p. 277 (name only, based on preceding). 

 Carcharodon acutidens Gibbes, Journ. Acad. Nat. Sci. Phila., (2) I, August, 



1848, p. 146, figs. 39-44. (New Jersey.) 

 Carcharodon angustidens Cope, Rep. U. S. Geol. Surv. Terr. Hayden, II, 

 1875. p. 295. (Greensand of No. 5, New Jersey.) 

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

 land Co. Miocene.) 

 L,eidy, Journ. Acad. Nat. Sci. Phila., (2) VIII, 1877, P- 236. (Vin- 

 centown.) 



Teeth comparatively narrow, robust, thickened and corn- 

 pressed. Coronal surface variably convex, though outer usually 

 slightly more or less flattened. Apex often decidedly acuminate 

 and deflected to one side. Cutting-edges usually coarsely ser- 

 rated, the seme often individually variable, and always gradu- 

 ated small towards tip of apex. Usually a broad basal cusp on 

 each side, sometimes a second, and serrations in its cutting-edge 

 usually enlarged. Tips of most all serratures rounded. Root 

 variable, usually robust, outer face flattened concavely, and inner 

 face often swelling in a large median bulge. In profile lower 

 margin of root often evenly emarginate to crescentic, though 

 ends not especially produced. Teeth reach 112 mm. 



This is quite variable and shows many variations in the teeth. 

 Some examples from the Maryland Miocene and others from 

 Monmouth County, X. J., approach Carcharodon polygurus, but 

 have the basal lateral cusps but slightly differentiated. Besides 

 detached teeth this species is known from two nearly complete 

 skeletons from near Antwerp in Belgium. 



Formation and -locality. I have examined a series of examples 

 from the State now in the Academy, all detached teeth. Mon- 

 mouth County 10 (P. D. Knieskern), 1 (Grier), 1 (C. C. Ab- 

 bott) ; Deal 2 (C. Breed), 4 (W. G. Budd) ; Shark River 1 

 without donor, 3 (Knieskern), 2 from the Miocene (T. A. Con- 

 rad) ; Long Branch 2 (H. C. Chapman) ; Farmingdale (H. A. 

 Pilsbry in 1892) ; Trenton Falls [Tinton Falls ? K.] (Abbott) ; 

 Burlington County 1 (Abbott), 16 (Conrad), 7 (C. Budd), 2 

 (J. P. Wetherill), 4 (E. Hallowell) ; Pemberton 3 (C. Budd), 

 1 (T. M. Bryan) ; Vincentown 17 (C. B. Barrett), from the 



