160 G. Nevill— iV^eitf Species of B racJcish-waier MollusJcs. [No. 8, 



This is one of the most distinct and interesting species o£ the genus 

 as yet discovered : the few im2:)erf orate whorls, with markedly obtuse apex ; 

 the distinct, though minute, close punctulation ; the unusually convex 

 whorls, with the remarkable iQng, compressed, slightly flattened, and egg- 

 shaped last whorl are all good characters. The suture is very distinct and, 

 on the last whorl, distinctly marginate below. The operculum is normal. 



Type Indian Museum, Calcutta ; also in coll. Dohrn, Warneford, 

 Theobald, Blauford, and Hungerford. 



Stenothtea blaktoedtajta, n. sp. 



T. minima, superjioie o'imata, siibventricoso-ovata, vix solidiuseula, 

 nitida, laevis, ^yallide cornea, suhj^elliicida ; spira suhacuta, a'pice minuto, 

 siibobUiso ; atifr. 4|, convexi, ultimus magnus, siibsohitus, tumide-ventrieo- 

 sus, suhhiangidatus, antice subapplanatus ; a])ertura subovalis, paululum 

 post ice retrorsa, peristomate continuo, sioperne angulato. Operculum ovale, 

 superne leviter acuminatum, vix crass iusculum, suhtranslucidum, spirale, 

 apice sulcentrali, interne testaceo-costatum. 



Long. 3yVj diam. 2^^ mill. 



Hab. Chilka-lake (type) ; also Port Canning and Madras. 



I am indebted to Mr. Wood-Mason for a careful examination of the 

 operculum of this small form : " it is oval, subtransparent, spiral, of few 

 whorls, with the apex almost central, on the inner side three ridges, one 

 semicircular and two short ones with a slight S-curvature, for the attach- 

 ment of the animal." 



The species is somewhat variable, especially as regards size and the 

 greater or less distinctness of the angulation of the last whorl. Specimens 

 from Port Canning agree better with the above- described typical form than 

 do those from Madras. 



I have named this species in honour of its first discoverer, Mr, H. F. 

 Blanford. It appears to be abundant at Port Canning, Chilka Lake, and 

 Town x)f Madras ; living with it there occurs another form, nearer 

 Bt. minima, Sow. (but I think distinct), with more produced spire than 

 8t. hlanfordiana, less tumid last whorl, without any trace of biangulation, 

 with the aperture rounder, and not angled above ; there is yet another 

 still smaller decollate form from Port Canning, probably also a distinct 

 species. 



Type Indian Museum, Calcutta ; also in coll. Hungerford, Theobald, 

 Beddome, Blauford, and Dohrn. 



Subfamily HYDEOBIIN^, Trosclel [emend.]. 

 Gcbiss der Sclinecken, I, 1857, as Group " Hydi-obiae" ; emend. Stimpson, 1865. 



