94 



olive-green with some narrow slightly darker streaks ; surface 

 glossy and smooth, under a lens showing fine, delicate and spaced 

 spiral striae, which become crowded and somewhat granulose ou 

 the base. Spire short, obtuse, the earlier whorls eroded, the 

 eroded portion reddish, tipped with black. Sutures deeply im- 

 pressed, the whorls strongly swollen just below them ; last whorl 

 angular at the periphery in front, the angle disappearing on the 

 last half whorl, which is rounded; umbilicus narrow, excavated 

 behind the columellar lip, surrounded by an angle. Aperture 

 oblique, rounded-ovate, bluish white inside; peristome narrowly 

 expanded at the edge, blunt, black, with a blackish border inside 

 and out; continuous across the parietal margin. Operculum 

 chestnut-brown and slightly wrinkled outside, with a conspicuous 

 raised or reflexed cuticular border ; inside with a conspicuously 

 raised and minutely roughened ovate area nearer the columellar 

 side, radiating striaB on the outside of this area, and a raised 

 border all around. 



Alt. 23, diam. 16-5-1 7*5 mm. 



Hob. Henzada, Burma ( Winkley). 



185. Vivipara (Idiopoma) heliciformis (Ft-auenfdd). 



Vivipara (Idiopoma) heliciformis (Frauenfeld) (as Paludina}, 

 Verhandl. zool.-bot. Ges. Wien, xv, 1865, p. 532, pi. 22 ; Zool. 

 Misc. pt. 5. 



Paludina dissimilis, var. decussntula or P. decussatula, Blanford, 

 P. Z. S. 1809, p. 445 ; H. & T., C. I. pi. 77, figs. 6, 10. 



Shell acuminately conic, scarcely umbilicate, rather solid, 

 smooth, polished, pale olive-green with eight or nine more or less 

 conspicuous brownish bands which disappear entirely on the 

 upper whorls ; whorls 6, regularly increasing, convex ; suture 

 well impressed ; aperture oval, somewhat angled above ; interior 

 of shell bluish white ; peristome acute, erect, somewhat thickened 

 towards the columella. 



Alt. 20*5, diam. 14-5 mm. 



Aperture: alt. 10, diam. 8 mm. 



Hab. Pondicherry ; Pegu (Stoliczka). 



Yar. viridis (Reeve), Hanley MS., Reeve, Conch. Icon. 1862, 

 sp. 20 (as Paludina. viridis) ; Nevill, J. A. S. B. 1877, pt. 2, p. 31, 

 & Anderson's Zool. Yunnan Exp. 1879, pi. 80, tig. 1 ; Nevill, 

 Hand List, pt. 2, p. 30. 



Original description : Shell clavately conical, dark green, whorls 

 rounded, smooth, rather constricted at the sutures, beneath the 

 lens minutely decussately striated throughout. 



Alt. 39, diam. 25 mm. (fig. in Conch. Icon.). 



Ifab. Kabyuet, Upper Burma (Anderson). 



