414 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



0. dissimilis. It seems useless to attempt any divisions into sub- 

 species based upon color characters only. 



EUPLEURA CAUDATA Say. 



Exceptionally large. 



UROSALPINX CINEREUS Say. 



The enormous size of our specimens taken from the oyster beds at 

 first led us to suspect a new species. Say's type, however, came from 

 the Maryland shore and is much larger than the shells of this species 

 from either north or south of this region. These, then, are probably 

 typical cinereus and specimens from Long Island as well as those 

 from Hatteras south belong to a much smaller race. Some of our 

 shells measure 51.5 mm. long by 26.4 diameter, while the general 

 average is not very much less. A few specimens (dead) dredged in 

 the open sea are of the smaller race generally knoAvn to collectors 

 (20.8 mm. long by 11.4 mm). 



EPITONIUM VIRGINICUM, new species. 

 Plate 13, fig. 1. 



Shell very small, broadly conic, white. Nuclear whorls 4, well 

 rounded, polished, separated by a strongly impressed suture. Post- 

 nuclear whorls inflated, marked by very slender lamellar, retractive 

 axial ribs, of which 36 occur upon the first, 48 upon the second, and 60 

 upon the last turn. The spaces between the axial ribs are a little 

 more than twice as wide as the ribs, and are crossed by very fine 

 spiral threads which run up on the sides of the ribs but do not cross 

 their summit. Of these spiral threads about 20 occur between 

 the sutures on the middle whorl. These threads are about one-half 

 as wide as the spaces that separate them, and are a little more 

 closely spaced at the summit than on the middle of the whorls. 

 Suture strongly constricted. Periphery of the last whorl well 

 rounded. Base well rounded, marked by the continuations of the 

 axial ribs, which extend undiminished to the umbilical region, where 

 they approach each other to such an extent that they become almost 

 fused. Aperture very broadly and very regularly oval; outer lip thin, 

 showing the external sculpture within; inner lip appressed to the body 

 whorl, evenly curved; parietal wall covered with a thick yellowish 

 callus. 



The type, Cat. No. 252568, U.S.N.M., was dredged at Chincoteague, 

 Vu-ginia. It has a trifle more than three post-nuclear whorls, and 

 measures: Length, 3 mm.; diameter, 1 J mm. 



This little gem appears to be a full-grown individual, judging 

 by the slight thickening of the lip. 



EPITONIUM SAYANA Dall, 



EPITONIUM LINEATA Say, 



EPITONIUM MULTISTRIATA Say, 



MELANELLA OLEACEA Kurtz and Stiinpson= "EULIMA OLEACEA " Kurtz and Stimpson. 



