SUPPOSED NEW SPECIES OF HELIOINA AND 

 BULIMULUS FROM COSTA RICA. 



BY H. B. PRESTON, F.Z.S. 

 Heliclna gemma, n.sp. 



Shell conical, elevated, bright yellow, apical whorls crimson, last whorl 

 tinged with orange-scarlet for some distance from 

 the mouth, the onter lip being also of a vivid orange- 

 scarlet colour. Whorls 5, convex, very finely 

 striated with lines of growth. Peristome expanded 

 and slightly reflexed. Aperture rather high and 

 3^ narrow. Operculum reddish -brown, normal. 



Diam. maj. G, alt. 7 millim. Aperture (inside 

 measurement) diam. 2.5, alt. 3 millim. 

 Hab. — Costa Rica. 

 A very beautiful and striking shell, whose nearest ally appears to be 

 H. oiceniana, Pfr., from Mexico ; from this, however, it differs in being 

 more globular, in the greater convexity of the whorls and in having one 

 less, in the narrower aperture, and in the colouration of the outer lip 

 (otherwise similar in both species) extending -further up the body whorl 

 than it does in //. oveniana. 



Bullmulus (Drymaeus) nubilus, n.sp. 



Shell elevated, conic, perforate, pale flesh-colour with a narrow dark 

 purple band extending all round, and at about one millimetre 

 behind, the outer edge of the peristome, also with a few 

 similar, though less marked bands (corresponding to the 

 periodic mouths) upon the spire. Whorls G-7, irregularly 

 malleated, and striated with lines of growth. Apex blunt. 

 Suture impressed. Umbilicus narrow and partly concealed 

 by the reflexed columella. Peristome slightly reflexed at 

 i" ba.se. Aperture oval. 



Diam. maj. 10.5., alt. 23 millim. Aperture (inside 

 measurement) diam. 5, alt. 9 millim. 



Hah. — Azarhar de Cartago, Costa Rica. 



