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, {Jhina. 



The largest species of the genus ; perhaps belongs to same 

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

 not figured) a var. imperatrix. 



H. PRUECELLENS, 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. 



Configured Species. 



H. BAGCATA, Button. 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 may enter this section. 



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



Rather solid, smooth, very lightly striulate with obsolete 

 impressed spiral lines, slightly shining, light corneous; whorls 



3, rapidly enlarging. Diam. 25, alt. 12 mill. 



Burmah. 



Section AUSTENIA, Nevill, 1878. 



* Typical. 

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



Arcuately striate, with obsolete irregular impressed spiral 

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

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



Diam. 30, alt. 13 mill. 



Bengal. 



