MACIiOCnLAMYS. 97 



Nauina vitrinoides, Bs. J. A. S. B. v, 1836, p. 350; Pfr. (Ilelix) 

 Mo7i. H(L iii, l«o3, p. (j2, pt. ; id. t. c. \u, 1876, p. 108, pt. : nee 

 Des/iai/e?. 



Shell very similar to that of M. indica, but broader in propor- 

 tion to the height, the spire lower, and the lower surface more 

 excavated around the perforation, which is larger. The mouth 

 is decidedly broader in proportion to its height ; as a rule, too, 

 the size is larger and the surface is more polished. Longitudinal 

 sculpture faint and often obsolete ; when visible it resembles that 

 of il/. indica. 



Major diam. 21, min. 18, height 9 mm. 



Hah. The country south of t'lie Gangetic plain froui Eajmahal 

 to Bundelkhaud, especially on hills at Eajmahal, Patharghatta 

 near Mirzapur, &c. ^ 



The animal is dark brow n or blackish ; both shell-lobes long 

 and pointed ; the lobe above the mucous gland very taperino- and 

 pointed. " ° 



h . Veyij fine microscopic strice. 



140. Macrochlamys hardwickii, Godwin- Austen, MoL Ind. i, 1883 



pp. 105-107, pi. 21, fig. 10 (sculpture), pi. 23, tigs. 1-4 (shells); 



pi. 28, figs. 1, 1 a, 1 b (anatomy). ' ^ 



Macrochlamys hardwickii, var.* politulus, Godwin- Austen, I. c. 



p. 107. 

 Macrochlamys syllietensis, Godwin-Austen, Mol. Ind. i, 1883, p. 94, 



pi. 21, fig. (sculpture only, no description). 

 [ Fide fig. 51 13, p. 133. Genitalia and teeth of the radula.] 



Shell perforate, conoidly depressed to depressed, thin, tawny,, 

 with a rather dull, greasy lustre above, more polished beneath' 

 very minutely and closely striated longitudinally, the striae only 

 visible under a microscope ; spire lo\\-, conoidal, suture slightly 

 impressed ; whorls 0, convex, the last broader, rounded at peri- 

 phery, convex beneath ; aperture slightly oblique, roundly lunate ; 

 peristome thin, in one plane, columellar margin curved, vertical 

 above, and rather broadly reflected at the perforation. 

 Major diam. IG, min. 14, height 9 mm. 



Hc(b. Lower Bengal, Sylhet, and AVestern Assam. Typical 

 specimens were obtained in Calcutta. Shells from Upper Assam 

 are, as a rule, rather larger and flatter and are more vitreous. 

 These form the xav. jwlitida. 



The shell of M. indica is not easily distinguished except by its 

 coarser and much less close longitudinal sculpture ; generallv it is 

 rather larger and flatter. 



The animal differs from that of 31. indica in several particulars. 

 The body and tentacles are pale grey, the mantle pale ochraceous. 

 The shell-lobes are smaller. The spermatheca and kale-sac are 

 both considerably longer and the form of the penis is different. 

 The radula contains about 109 rows of teeth, arrano-ed thus • 

 50 . 1 . 12 . 1 . 12 . 1 . 50 (63 . 1 . 63). ° 



