460 DESCRIPTION OF NINETEEN 



and its general resemblance to the H. contusa of Fer., (Desh., No. 156,) being 

 obliquely depressed like it in the last whorl. In the mature specimens the 

 umbilicus is closed, and has a reflected fold. The junior specimen has the 

 epiphragm perfect. It is very remarkable, being deeply striate, depressed in 

 the middle, and inverted at the outer edge. 



Found on the roots of the Mangrove. 



It belongs to the group which Mr. Gray proposes to separate under the ge- 

 neric name of Streptaxis. 



Helix Balestieriana. Plate XII., Fig. 10. 



Testa orbiculato-conoided, sinistrorsd, siibcarinatd, subtenui, castanea, inferne, inflata, prope 

 periphxriam tenebrosiori, minute rugoso-striatd, perforatd; anfraciibus senis, convexis; aperturd 

 parvd; labro incrassato, subreflexo; columella laevi. 



Shell orbicular conoidal, sinistral, somewhat carinate, rather thin, chestnut-coloured, inflated be- 

 low, darker near the periphery, with minute rough strias, perforate ; whorls six, convex ; aperture 

 rather small, lip thickened, slightly reflected ; columella smooth. 



Hab. Philippine Islands. J. Balestier. 



My Cabinet. 

 Diam. 1.4, Length .8 of aii inch. 



Remarks. — Any species of the Gasteropoda with the sinistral character, how- 

 ever inobtrusive it may be in other respects, must always prove highly inte- 

 resting. I owe this, with many other fine shells, to the kindness of Mr. Ba- 

 lestier,. of Singapore. It is, perhaps, more nearly allied to H. Himalana, 

 (nobis,) than to any other species, but may at once be distinguished by its 

 thickened and reflected lip ; also by its darker colour, and having two more 

 whorls, which are less flat. It is also a larger shell, but not so large as H. 

 Senegalensis, Lam., (which comes here from Canton in abundance,) the latter 

 being a more globose species, with transverse lines. 



