OF SANTO DOMINGO. 



227 



The species is most like M. splrata, but is not more than a third of its length, is 

 less tapering, and is at once distinguishable by its strongly clathrate sculpture. 



EULIMA. Risso. - 



E. acicularis. Gabb, n, s. 



Shell elongate, slender, sides straight, surface polished, whorls numerous, elongate ; last whorl produced iu ad- 

 vance, mouth long narrow, acute behind. Length .G inch. 



Distinguished by its very elongate form. JSTot unlike HJ. Infasciata, d'Orbigny, 

 but larger and more slender. 



E. r o b u s t a . Gabb, n. s. 



Shell minute, elongate, widening much more rapidly than the preceding; sides straight, whorls numerous, short; 

 suture very transverse ; base of body whorl moderately produced ; aperture small. Length .15 inch. 



From the preceding, this can be distinguished by its much smaller size, its 

 transverse suture and short mouth. From M subcarinata, d'Orb., it differs in being- 

 more slender and in beino- less ano-ulated at the base. 



o o 

 E. crassilabris. Gabb, n. s. 



Shell short, robust, spire elevated, nearly three times as long as tlic moiitli, whorls numerous, surface polished, 

 base of body whorl elongated ; mouth long, acute behind, produced in advance, outer lip thickened and very promi- 

 nent at its anterior lateral mai'gin. Length about .1 inch. 



NISO. Risso. 



N. grandis. Gabb, n. s. " '' ' 



Shell large, subulate; whorls numerous, short; siirfacc gently convex, polished ; suture well marked ; body whorl 



rounded on the basal margin, base sloping, gently convex ; umbilicus moderate, bordered by carina on the inner face 



of the angle. Aperture small, acute behind, rounded iij advance. 



A single fragment showing the last -fine whorls is .8 inch in length, Avith the body 

 whorl .5 inch wide. Its unusually short volutions will serve to distinguish it from 

 any other known species. 



N. m i n u t a . Gabb, n. s. 



Shell minute, broad, spire elevated, whorls numerous, apical angle wide, sides straight, surface polished; base of 

 body whorl sub-angulated, lower surface slightly convex ; umbilicus moderate, bordered by an angle. Aperture 

 broad, sub-angulated in advance. Length .07 inch. 



It is possible that this may be a young shell, but its specific characters are so 

 marked it cannot well be mistaken. 



lOPSIS. Gabb, 11. rjen. 



Shell Eulimoid, j)olislied, spire elevated, sutures obsolete, apex dextral, nou-umbilicated columella twisted and 

 produced into a short, lip-like canal. 



This ivory-like suiface, obsolete suture and whole general appearance of this shell 

 prove its close relationship to Etilima while its faintly twisted columella, extended 

 to such degree as to produce a short, (thongli not notched canal), distinguishes it from 

 the other genera of the family. ISTamcd from its resemblance in form to the fresh 

 water genus lo. 



