62 CRETACEOUS AND TERTIARY FISH. 



feet 7 inches. Its distribution through most all Tertiary seas 

 must have rendered incessant the butchery of the majority of 

 other acquatic animals. Smaller teeth of this species from the 

 Maryland Miocene have their edges finely serrated, one showing 

 traces of an imperfect or very obsolete basal cusp. Altogether, 

 except some of Yarrow's examples, the entire series of New 

 Jersey teeth examined differ little from Agassiz's figures, except 

 in having the serrations along the cutting-edges worn. 



Carcharias poly gurus Morton seems to be the oldest available 

 name for this species, and must, therefore, be adopted, C. meg- 

 alodon Charlesworth, the name now widely adopted, not appear- 

 ing until the following year. 



Formation and locality. I have examined the following teeth 

 from the Tertiary marls : Monmouth County i without donor, 

 i (Grier) ; Shark River 2 (P. D. Knieskern) ; Burlington 

 County 1 (T. A. Conrad) ; Vincentown 5 (T. M. Bryan) ; At- 

 lantic City in Atlantic County 1 (E. Lippincott) ; Allowaystown 

 in Salem County 3 fragments (H. C. Yarrow) ; "New Jersey" 

 1 (Spachman), 2 (J. P. Wetherill), 1 (G. Watson) ; "Delaware 

 Bay" 1 (Corse), 1 (C. C. Abbott). I also have seen an example 

 from Delaware (P. Uhler). 



In the Geological Survey collection are 4 teeth without data. 

 [The formations represented are apparently the Manasquan, 

 Shark River and perhaps the Miocene, K.] 



Genus CORAX Agassiz. 



Corax Agassiz, Poiss. Foss., Ill, 1843, P- 224. Type Galens pristodontus 

 Agassiz, first species, restricted by Woodward, Cat. Foss. F. Brit. Mus., 

 I, 1889, p. 423. 



Teeth compressed, more or less triangular, usually with dis- 

 tinct marginal serrations. In external form very suggestive of 

 teeth or Sphyma or Eulamia, but differing in the absence of an 

 internal cavity. 



An imperfectly definable genus, comprising extinct species of 

 small or moderate size, known only by the teeth. About 11 

 species have been described. 



