58 CRETACEOUS AND TERTIARY FISH. 



sharply pointed, and faces convex in varying degrees, but usually 

 outer less so. Occasionally distinct vertical plications on outer 

 coronal face. Apex usually erect, seldom deflected much. Cut- 

 ting-edges mostly entire, or only occasionally in small examples 

 with a few obsolete serrations near base. Usually one cusp 

 basally on each side, often large, and edges entire. Rarely still 

 a second smaller basal external cusp. Root robust, thick, outer 

 face usually flattened, and inner face swelling in a large con- 

 vexity. In profile lower margin of root emarginated to cres- 

 centic, and ends not much produced. Teeth reach 84 mm. in 

 length. 



This appears to be rather variable. Some writers think cer- 

 tain teeth ascribed to it may belong to Carcharodon, as in rare in- 

 stances their edges show the faint serrations alluded to above. 

 Though known only from detached teeth, this species would evi- 

 dently have obtained some size, being very likely an all-sufficient 

 predatory monster. The teeth are among the most abundant of 

 all the sharks' teeth found in the fossil beds in the State. Un- 

 fortunately Morton's Lamna lanceolata is the oldest name avail- 

 able for this species, having virtually several years priority over 

 the familiar Otodus obliquus Agassiz. 



Formation and locality. I have examined many series of speci- 

 mens in the collections of the Academy, most of which are with- 

 out detailed data. New Jersey 5 (Burtt), 1 (C. Budd), 1 (J. 

 P. Wetherill), 1 (B. Coates), 14 (C. C. Abbott), 5 (E. D. 

 Cope) ; Monmouth County 12 (J. H. Slack, J. Parke. J. H. 

 Powell, Jr., Abbott), 1 (Powell), 1 (Abbott), 2 (Slack), 15 

 (W. Cleburne), 1 (Burtt); Farmingdale 12 (PI. A. Pilsbry in 

 1892) ; Shark River 1 (P. D. Knieskern) ; Long Branch 1, no 

 donor, 1 (H. C. Chapman) ; Burlington County 3 (C. Budd), 

 39 (T. A. Conrad) ; Vincentown 84 (T. M. Bryan), 21 (Bryan 

 on May 4th, 1875) from greensand, 1 (G. Bryan), 1 (C. B. Bar- 

 rett) ; Pemberton 7 (C. Budd); Pointville 2 (W. F. Atlee in 

 December, 1863) ; Fostertown 1 (H. N. Potts) ; Med ford 6 

 (L. Woolman) ; Allowaystown in Salem County 1 (H. C. Yar- 

 row). 



In the collection of the Geological Survey are the following: 

 Monmouth County 2 (P. D. Knieskern), upper marl of Far- 



