1890.] NATURAL SCIENCES OF PHILADELPHIA. 35 



ley; it was a dead shell, and not fully mature, but recognizable. 

 The species consequently seems to be widely distributed along the 

 South-Atlantic and Gulf Coasts.^ 



In eastern Florida, Volusia Co., etc., a form has been found to be 

 quite common which I refer to this species, but as a distinct variety 

 which may be called ovulum. It is somewhat smaller, ovate, the 

 striation and rugosity of the surface are less marked, and the inferior 

 apertural lamella is wanting ; in turn it has in most examples a lam- 

 ella at the base (between inferior columellar and inferior palatal) 

 and the callus in the palatal wall is rather strong. The coloration 

 of part of them is somewhat lighter. It cannot be confounded with 

 V. ovata Say, its relations to the type of rugosula being evident, and 

 in addition, ovata has been found with it. Nor can it be referred 

 to ventricosa : it is larger and stronger, of much darker color, its sur- 

 face is not so smooth and polished, it has 3 or even 4 lamellie more, 

 and the columella is longer. 



1 Two specimens were sent in by Mr. H. Hemphill, who collected them at Fish 

 Camp, Fresno Co., Cal. 



