442 Systematic Paleontology 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences. 



Outside Distribution. — Monmouth Formation. Navesink marl, New 

 Jersey. 



Genus ODONTOFUSUS Whitfield 

 LMon. U. S. Geol. Survey, vol. xviii, 1892, p. 65] 



Type. — Fasciolaria slacki Gabb. 



" Shell univalve, fusiform, resembling Fusus or Fasciolaria in general 

 appearance; spire elevated, with vertically plicated whorls; anterior 

 extremity prolonged into a straight canal of greater or less extent; colu- 

 mella marked near or above the middle by a single oblique fold; surface 

 probably lirated, although no evidence of such a feature remains on the 

 casts. 



" I am compelled to propose a new generic name for a group of species 

 possessing the above characters, although reluctant to do so on internal 

 casts. The specimens closely resemble specimens of Fusus or Fasciolaria 

 in their elongated fusiform character and prominent volutions, which have 

 been strongly marked by vertical folds ; but they differ from either in the 

 characters of the columellar ridge or fold. From Fusus they differ in its 

 presence and in the straight beak, and from the other in having only a 

 single ridge, which is placed much higher on the columella. Mr. Gabb 

 noticed the ridge on the columella in his original description of F. slacki, 

 and in some later remarks * he suggests its relation to Piestochilus Meek. 

 Mr. Meek^s genus usually possesses more than one fold, but differs very 

 materially in the characters of the spire and the more elongated anterior 

 beak. In fact, Piestochilus more closely resembles Mitra than Fasciolaria. 

 It is somewhat uncertain whether there have been spiral stria? on the shell, 

 no evidence of such feature being present on any of the many casts 

 examined."— Whitfield, 1892. 



Xone of the species thus far referred to this genus range beyond the 

 Cretaceous of North America. 



Etymology: 6Sois, tooth; Fusus. a closely related genus. 

 1 Proc. Acad. Nat. Sci., Phila., 1876, p. 282. 



