HELICARION. 177 



H. MEMBRANACEUS, Benson. PL 40, figs. 34, 35. 



Depressed, subinembranaceous, obsoletely obliquely striulate, 

 the striae closer towards the apex, pellucid, greenish corneous, 

 spire subplanate, suture not margined ; whorls 3^, rapidly 



enlarging. Diam. 11, alt. 4 mill. 



Ceylon. 



H. CEYLANICUS, Beck. PL 41, figs. 39-41. 



An undescribed species, figured and named in Beck's Index ; 



it has not been identified. 



Ceylon. 



H. BIRMANICUS, Phil. PL 41, fig. 42. 



Semiglobose, very thin and smooth, shining, yellowish green ; 

 whorls 4, rapidly enlarging, the last subplanulate at base. 



Diam. 9-3, alt. 4-6 mill. 



Mergui, Burmah. 



H. RHAPIIIELLUS. Martens. PL 40, figs. 36-38. 



Heliciform, rimate, thin, shining, yellowish, with white- 

 bordered suture ; whorls 3, darker colored near the aperture ; 

 columellar lip reflected above, the extremities of the lip joined 



by a callus. Diam. 7'5, alt. 5 mill. 



siam. 



H. COCHINCHINENSJS, Morelet. PL 41, figs. 43-45. 



Depressed globose, very thin, and lightly striate, with obso- 

 lete spiral lines, pellucid, greenish corneous, suture narrowly 

 margined ; whorls 3-|, rapidly enlarging, base subrugulose. 



Diam. 23, alt. 12 mill. Dien-ba, Cochin China. 



H. RUSSEOLA, Morelet. PL 41, figs. 46-48. 



Subperforate, globosely depressed, very thin, pellucid, shining, 

 radiately striulate below the suture, orange-brown, suture 

 submargined ; whorls 3, rapidly increasing. 



Diam. 7, alt. 4'5 mill. 



Cochin China. 



H. NUCLEATUS, Stoliczka. PL 41, figs. 49-51. 



Thin, translucent, light corneous, shining, very minutely 

 striate; whorls 3| ; lip very thin, Diam. 9, alt. 5'3 mill. 



Penang. 

 H. PERMOLLIS, Stoliczka. PL 41, figs. 52-54. 



Conoidally helicoid, imperforate, very thin, almost membra- 

 naceous, translucent, light yellowish ; whorls 4J, lightly striate, 

 the last with obsolete spiral lines on the base ; columellar lip 

 slightly reflected above. Diam. 8'4, alt. 6 ! 3 mill. 



12 Penang. 



