1896.] NATURAL SCIENCES OF PHILADELPHIA. 21 



DESCRIPTIONS OF NEW SPECIES OF MOLLUSKS. 



BY HENRY A. PILSBRY. 



Marginella Veliei n. sp. 



Shell oblong, the body-whorl tapering (somewhat Conus-like) from 

 the rounded shoulder to the base, spire conic. Surface brilliant, 

 enamelled over the sutures and throughout, pale 

 olivaceous-buff, slightly bluish around the middle of 

 body-whorl, the outer lip white. Whorls about 5, 

 nearly flat, the last convex above, rather flattened 

 in the middle. Aperture about four-fifths the length 

 of shell, its upper half narrow, lower half about 

 twice as wide ; pale buff" inside ; outer lip slightly re- 

 tracted at the two ends, smooth within, thickened by 

 a moderate white callus outside, which is not pro- 

 M. VelieiX^- ^uced upward to the preceding suture. Columella 

 bearing four plaits, the lower three subequal, upper 

 one slightly smaller and more deeply inserted. 

 Alt, 15, diam. 7*1 ; alt. of aperture 12 mm. 

 Alt. 14'(3, diam. 7'5 ; alt. of aperture 11*8 mm. 

 Boca Ciega Bay, Florida (Dr. J. W. Velie!). 

 This species resembles M. Hindsi Petit in outline, Imt the callous 

 rib of the outer lip is not continued upward as in that species. It 

 is notable for the rather slender and tapering form of the body- 

 whorl and slight inward bend of the outer lip. It is somewhat re- 

 markable that so large a Marginella as this has until now escaped 

 notice on our Florida coast. 



Siphonalia semiplicata n. sp. 



Shell fusiform, tapering about an equal distance above and below, 

 solid and strong, gray with some indistinct brownish patches. Whorls 

 about 8, nucleus smooth (partly lacking by erosion) ; 5* later 

 whorls sculptured with cord-like spirals about equal to their inter- 

 vals in width, about 11 in number on penultimate and three preced- 

 ing whorls; last Ih whorls having short, sometimes indistinct, sub- 

 vertical waves at the shoulder, the preceding whorls merely convex, 

 with no vertical folds. Last whorl contracted and produced at base 



