HELICARION. 179 



H. IMPERATOR, Gould. PI. 41, figs. 76-78. 



Fragile, ventricose, striulate, with impressed spiral lines, 

 greenish corneous ; whorls more than 3 ; columellar margin not 



thickened. Diam. 1-5, alt. *75 in. 



Hong Kong, China. 



The largest species of the genus ; perhaps belongs to same 

 group as H. prsestans, Gould. Westerlund has described (but 

 not figured) a var. imperatrix. 



H. PR^CELLENS, Martens. PI. 42, figs. 1, 2, 3. 



Thin, diaphanous, regularly striulate and with light impressed 

 lines on the upper part, shining, yellowish green, with a narrow 

 brown sutural line; whorls less than 3. Diam. 28, alt. 19 mill. 



Isl. of Salanga, West Coast of Malacca. 



Un figured Species. 

 H. BACCATA, Hutton. Afghanistan. 



H. EDGARIANUS, Benson. Ceylon. 



H. ATARANENSIS, Theobald. Martaban, Burmah. 



H. SIAMENSIS, Haines (Diam. 30, alt. 15 mill.). Siam. 



H. ALBELLA, Martens. Java. 



H. SINICUS, Martens. China. 



Section CRYPTOSOMA, Theobald, 1857. 



Shell more solid ; animal completely retractile within it, and 

 closing the mouth with an epiphragm in aestivation. 

 Perhaps other Asiatic species ma}^ enter this section. 



H. PR^STANS, Gould. PI. 42, figs. 4, 5. 



Rather solid, smooth, very lightly striulate with obsolete 

 impressed spiral lines, slight!}^ shining, light corneous ; whorls 



3, rapidlj r enlarging. Diam. 25, alt. 12 mill. 



Burmah. 



Section AUSTENIA, Nevill, 1878. 



* Typical. 

 H. GIGAS, Benson. PL 42, figs. 6, 7. 



Arcuately striate, with obsolete irregular impressed spiral 

 lines ; whorls 2J, very rapidly increasing, the last subdepressed 

 above, base very narrow ; aperture very large, subcallous within. 



Diam. 30, alt. 13 mill. 



Bengal. 



