1880.] W. T. Blanford — Contributions to Indian Malacology. 195 



differently shaped. Tlie sculpture is somewhat finer in *S^. ? diflodon, and 

 the basal margin of the aperture is suhangularly concave, without the curv- 

 ing forwards due to the transverse portion of the larger tooth in 8. ingrami. 

 The last character is well shown in the ' Conchologia' figure. 



8. Macrochlamts ? plattchlamts, sp. nov., Plate II, Fig. 9. 



Testa perforata y conoideo-depressa, fertenuis,nitida, laevigata, sub lente 

 obsolete striatula, fulvo-cornea. Spira parum elevata, apice ohtuso, suturd 

 levi aliquando marginatd. Anfr. 5, vix convexiusculi, regulariter accres- 

 centes ; ultimus non descendens, peripherid rotimdatus, suitus convexus. 

 Apertura obliqua, lunaris, lutior quam alta. Feristoma tenue, simplex, 

 leviter simiatum, innrginibus remotis, callo tenuissimo jicnct'is, columellari 

 hrevissime verticali, peranguste reflexo. JDiam. inaj. 11, min. Q\, axis 5|. 



Animal pallio maxima indutum, duos loios latos linguiformes emitten- 

 te, qui spiram testce omnino circumtcgunt. 



Hab. Ad Bombay. 



Shell perforate, conoidly depressed, very thin, smooth, and polished, 

 obsoletely striated beneath the lens, fulvous horny in colour. Spire sub- 

 conical, but little raised, apex obtuse ; suture smooth, scarcely impressed, 

 sometimes marginate. Whorls 5, very slighly convex, regularly increasing 

 in size, the last not descending, rounded at the periphery, convex below. 

 Aperture oblique, lunate, broader than high. Peristome thin, simple, slight- 

 ly curved when viewed from the side ; margins distant and united by a 

 thin callus ; the columellar border vertical for a very short distance, slight- 

 ly reflexed. Major diameter O M, minor 0'38, axis 22 inch. 



This shell belongs to the group of thin, more or less depressed forms 

 allied to the type usually known as M. vitrinoides {31. indicus, Benson). 

 It appears, so far as I can see, to be undescribed, as is also, I believe, an 

 allied form of darker colour, and with a subangulate periphery, occurring 

 at Trichinopoly and elsewhere in the neighbourhood of the Coromandel 

 coast south of Madras. 



The animal of M. platyclilamys is chiefly distinguished by the peculiar- 

 ly broad shell-lobes, which, instead of being narrow and attenuate towards 

 the ends, as in most allied species, are broad and flat, so as sometimes to 

 cover the whole spire, and usually to conceal all except a narrow band. 

 These lobes somewhat resemble those in the genus Selicarion. The lobe 

 above the caudal gland is very much smaller than it usually is in Macro- 

 chlamys and rounded, not horn-shaped. 



This shell is common in the island of Bombay and neighbouring low- 

 lands on the west coast of India, and I have seen a form Irom the hills of 



