74 Bulletin American Museum of Natural History. [Vol. XIX, 



tion of the inner face of the left palatine and of two man- 

 dibular teeth we find a moderately coarse striation. Cope's 

 specimen " No. 2," which is No. 1890 of this Museum, presents 

 both palatines, one with the fang complete. The ornamenta- 

 tion is as in No. 1837. The same is true of the fang of No. 

 1865, except that the striation, both on the inner and the 

 outer face, is somewhat coarser. The striation of the hinder 

 part of the inner face of No. 2385 is decidedly coarser than 

 that of any of the other specimens. All these teeth show 

 that K. doliclius differs from E. petrosiis in having the outer 

 face with practically the same convexity as the inner. The 

 latter seems also to have attained a considerably larger size. 

 We must, however, keep in mind that there are likely to be 

 small specimens of E. pelrosus. 



Enchodus tetraecus Cope. 



Enchodus tetrcecus Cope (E. D.), Vert. Cret. Form. West, 1875, p. 278. 

 — Woodward (A. S.), Cat. Foss. Fishes, IV, 1901, p. 205. — 

 Hay (O. p.), Bibliog. and Cat. Foss. Vert. N. A. 1902, p. 389. 



Enchodus tetracus LooMis (F. B.), Palseontogr. XLVI, 1900, p. 277. — 

 Stewart (A.), Univ. Geo!. Surv. Kansas, VI, 1900, p. 375. 



This Species is said to have been based on various teeth 



from the Greensand of Delaware and New Jersey. One whole 



tooth, which is labelled as the type, is in the 



Museum and has been given the number 



j 2248. There is another with 



y-N the distal end missing. Cope's 



description is sufficient, but it 



is thought to be proper to pre- y,™ ^-^ 



sent here a drawing of the type "' i """^^^ 



(Fig. 54). Figure 55 represents 



F{g. 54. EncAodus the paratype, an imperfect Fig. 55. EncAodus 



......«.^Cope.^No. ^^^^^^ designated as No. 2249. Srx^..'^P^a:aty';°e: 



c''ros's"s"ectio'n"^ '"' The sharply defined striations fros'^^ction"^ '"'' 



of the very convex inner face 

 distinguish this species from E. ferox. The teeth are ap- 

 parently slenderer than those of E. petrosiis, and the shallow 



