86 TRANSACTIONS OF THE WAGNER FREE 



Lister's species, especially the outline of the wing, is so unlike that of 

 any stromb, except the Florida fossil, that one might be readily tempted, 

 making due allowance for imperfect drawing, to unite the two into a 

 single species, the more especially as the shell is described (by Gray) as 

 being white, a feature foreign to the recent representatives of the 

 family, and indicative to a certain extent of a fossil condition. Indeed, 

 the only marked difference between the two forms appears to lie in the 

 more pronounced nodulation of the spire in S. integer, a feature not un- 

 likely exaggerated in the drawing, which is manifestly erroneous in the 

 delineation of the spire. Were it not for Morch's positive statement that 

 he has secured a specimen, with a thin lip, absolutely conforming to 

 Lister's drawing, I should have felt little hesitancy in relegating 

 Swainson's species to the category of fossils, and of uniting with it 

 the species from the Caloosahatchic ; and even now I am far from 

 convinced that this identity does not exist, but as it appears prac- 

 tically hopeless to positively identify any form with the S. integer, I 

 have deemed it the safer plan to describe the Florida fossil as a distinct 

 species. 



Strombus pugilis, L. 



Linn?eus, Syst. Natune, I2th ed., p. 1209. 



Tryon, Manual of Conchology, Part xxvi, p. 109, pi. 2, figs. 13-15. 



This species, in the variety known as 5. alatiis, Gmel., is fairly 

 abundant in the Venus canccllata bed at Fort Thompson, but less so in 

 the underlying Pliocene deposits. The specimens obtained do not differ 

 essentially from the recent form. 



Genus CYPR.EA. 

 Subgenus Siphocyprsea, Heilprin. 



I propose this subgenus for a group of remarkable Cypraaas, which 

 differ from all other members of the family in the possession of a deep, 

 comma-shaped sulcus or depression, occupying the apical portion of the 

 shell, and which, as the posterior continuation of the aperture, is curved 

 dextrally around the axis of involution. It would appear that the presence 

 of this sulcus is due to a siphonal prolongation of the mantle, which, 

 contrary to what is seen in other Siphonata, must have been pro- 

 jected in advance of the animal ; otherwise, the position of the sulcus 

 would have been posterior, instead of anterior, to the apical axis. The 

 other characters of the shell are those of Cypraea generally. In the 

 absence of positive knowledge respecting the organization of the 

 animal, I have retained it provisionally under Cypraea, although not 

 improbably the distinguishing characters above indicated are of generic 

 value. 



