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 Mull., vii, 114. H. obliquata Dh., vii, 116. _ 

 H. coelaxis Pils., vii, 114. 



Section Pfei/eria Gray, 1853. 



Pfeiffetia GRAY, P. Z. S., 1853, p. 110. type H. micans Pfr. 



Shell globose, iiuperforate, 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. micans 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- 

 lated at periphery ; surface spirally striate, having hydrophanou& 

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

 panded below ; columella simple, thin, vertical, deeply inserted. 

 Anatomy unknown. 



H. 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 

 colored but lacking hydrophanous markings; surface lacking spiral 

 sculpture; last whorl scarcely descending in front; lip blunt, very 

 narrowly reflexed throughout; columella subvertic'd], deeply inserted^ 

 the umbilical area covered by a concave white callus. Anatomy 

 typical. Type H. aurata Sowb. 



Distribution, Northern Luzon. 



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



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

 v. luteocincta Semp., vii, 171. 



