HELIOOSTYLA. 221 



Group of H. extensa. 



H. conformis Fer., vii, 113. H. najas Pfr.,vii, 115. 



H. leucophthalma Pfr., vii, 113. H. physalis Pfr., vii, 115. 



H. extensa Miill., vii, 114. H. obliquata Dh., vii, 116. 

 H. coelaxis Pils., vii, 114. 



Section Pfei/eria Gray, 1853. 



Pfei/eria GRAY, P. Z. S., 1853, p. 110. type H. mieans Pfr. 



Shell globose, imperforate, the slender axis solid; thin, brittle,, 

 uniform white and glossy; whorls 4, the last not descending in front. 

 Aperture lunar; lip thin, acute and fragile ; columella slightly 

 thickened, vertical, deeply inserted in the base. Animal as in Heli- 

 costyla generally, except that the mantle is reflexed over the acute 



HP. 



H. mieans Pfr., vii, 128. Northern Luzon. 



Section Leytia Pilsbry, 1892. 



Leytia PILS., Man. Conch., vii, p. 129 (Jan. 30, 1892). 



Shell imperforate, globose, thin ; whorls few (4), the last angu- 

 ited at periphery ; surface spirally striate, having hydrophanous 



jam white bands. Aperture very large ; lip simple, a little ex- 

 unded below ; columella simple, thin, vertical, deeply inserted, 

 .natomy unknown. 



[. fragilis Sowb., vii, 129. Island of Leyte, Philippines. 

 leytensis Pfr. 



Section Chromatosphcera Pilsbry, 1892. 

 Chromatosphcera PILS., Man. Conch., vii, p. 169 (Jan. 30, 1892). 



Shell imperforate, depressed globose, solid and opaque, richly 

 ^lored but lacking hydrophanous markings; surface lacking spiral 

 \lpture; last whorl scarcely descending in front; lip blunt, very 

 larrowly reflexed throughout ; columella subvertical, deeply inserted^ 

 ic umbilical area covered by a concave white calJus. Anatomy 

 typical. Type If. aurata Sowb. 

 Distribution, Northern Luzon. 



". aurata Sowb., vii, 170. H. lividocincta Semp., vii, 171. 



[. erubescens Semp., vii, 170. H. pudibunda Semp., vii, 171. 

 v. luteocincta Semp., vii, 171. 



