PIIVLOGENY OF FUSUS AND ITS ALLIES. 



131 



Locality: Claiborne, Alabama (Conrad) (Nat. Mus. 2973). 

 Horizon: Eocene, Claiborniaii. 



CLAVILITHES VICKSBURGENSIS (Conrad). 



1849. ClavcUa vicksbiirgensis Conrad, Journ. Phil. Acad. Nat. Sci., sen 2, vol- 

 I, p. 207. 



1850. ClavcUa vicksbiirgensis Conrad, ibid., vol. II, pi. I, fig. 5. 



"Fusiform, smooth, moderately thick; spire conical, with obtuse 

 longitudinal remote varices, first and second volution entire ; suture 

 impressed ; body whorl regularly rounded towards the beak ; aperture 

 and canal about one tenth longer than the shell ; beak straight and 

 pointed 2)4 • H-" 



"Locality: Vicksburg, Mississippi, abundant." 



A few faint undulations appear near the top, but otherwise the shell 

 is smooth and recalls C. cgregiiis. 



Horizon: Vicksburg stage. Lower Oligocene. 



CLAVILITHES KENNEDYANUS Harris. 



1895. Clavilithcs kcnncdyanus Harris, Proc. Acad. Nat. Sci. Phil., p. 72, pi- 7> 



fig. 8. 



vol. Ill, p. 44, pi. 5, fig. 8 



1899. Clavilithcs kennedyantis Harris, Bull. Am. Pa 



(variety). (See fig. 17.) 



This is a slender species with the spire taper- 

 ing to a very acute point. It has somewhat the 

 aspect of a Clavellofusus. No fully preserved 

 protoconch has been observed. It consists ap- 

 parently of three or more rounded whorls, loosely 

 set one upon the other. The ribs of the conch are 

 at first of uniform strength throughout, but later 

 they become stronger in the middle and obsolete 

 towards the sutures. They are at first separated 

 by a space much more than their width apart, 

 then grow broader, with narrowing interspaces. 

 A slight revolving concavity occurs just below 

 the suture. The ribs disappear on about the 

 sixth whorl of the conch, after which the whorls 

 are convex and smooth, the spirals being scarcely 

 visible. The last of the smooth whorls embrace 

 the preceding ones up to the suddenly constricted 

 base of that volution, thus giving the spire a uni- 

 form tapering aspect. 



Localities: Woods Bluff, Ala. (Acad. Sci. 

 6914) ; near Thomasville and Choctaw Corner, 



Alabama (Nat. lAIus. 88S5) ; NanafaHa, Ala., and Smithville, Bastrop 

 Co., Texas (Harris). 



Horizon: Eocene, Lignitic and Lower Claiborne stages. 



Fig. 17. Clavilithes 

 kcnncdyanus. (After 

 Plarris.) 



