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 Pfeifferia Gray, 1853. 



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



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

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

 Aperture lunar ; Up 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 

 lip. 



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



Section Leytia Pilsbry, 1892. 



Leytta 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 hydrophanous 

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

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

 Anatomy unknown. 

 H. fragilis Sowh., 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 subvertica], deeply inserted? 

 the umbilical area covered by a concave white callus. Anatomy 

 typical. Type If. 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. 



