[ 207 ] 



ART. XV. — Descriptions of new Fossil and Recent Shells of the United States. By 



T. A. Conrad. 



UPPER EOCENE FOSSILS. 

 CLAVELLA, Swainson. Fusiis, Lam. 



C. vicKSBURGENSis. — Fusifortii, smooth, moderately thick ; volutions eight, with straight sides ; spire 

 conical, with obtuse longitudinal remote varices, first and second volutions 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 J. J. 



Locality. Vicksburg, Mississippi. Abundant. 



FULGUR, Mont. 



F. NODULATUM. — Pyriform, thick, with strong rugose revolving lines, with a very fine intermediate line 

 between most of the large strice; on the inferior part of the body whorl is a space without lines, below 

 which the whorl has a slightly concave slope towards the beak ; angle tuberculated, the series 

 continued on the spire near the suture : in some specimens the tubercles margin both sides of the 

 suture ; spire short, the sides of the volutions concave ; labrum with rather distant prominent acute 

 lines within; beak straight. If. §. 



Locality. Occurs with the preceding. 



This species is easily distinguished from F. spiniger, {Fusus spiniger,) of the same 

 locality, by its much less prominent spire, and by having tubercles in place of 

 spines. 



TRITON, iMont. 



T. SUBALVEATUM. — Subfusiform ; varices obsolete, except one near the margin of the labrum, which is 

 broad ; revolving sulci in pairs with a broad flattened interval ; longitudinal wrinkles distinct and the 

 longitudinal ribs or varices numerous, narrow and obscure, except on the spire where they are more 

 prominent ; sutural area subcanaliculate ; aperture wide ; labrum with remote prominent lines within ; 

 columella with a prominent plait near the middle and another near the angle of the aperture. 



a 5 



*• B . 



Locality. Occurs with the preceding. 



The three fossils above described occur near the base of the cliff at Vicksburg, in 

 company with Natica Mississippiensis and Corhula alta, all abundant, and none have 

 been found in the group above, except one valve which I supposed to be of the last 

 named species, when I saw it at Vicksburg. As I have not access to the specimen, 



53 



