MOLLUSCA OF INDIA, 281 



snhimpressa, albido marf/inata, Apertura perohliqiui, ohlongo-ovata. 

 Peristoiiiatis man/o anterior antice valde arcnatus ; maryo dexter 

 sahandnlatus ; margo hasalis memhranaceus. 



" Diam. maj. 17, minor 11 mm. ; axis 5 mm. 



" Aperturse alt. 8, lat. 11 mm. 



" Habitat apud Darjeeling. 



"This very pretty shell is very distinct from any species 

 hitherto described from Northern India. It is probably allied to 

 some of the Ceylon species, which like it liave a membranaceous 

 base. I have had the specimens for some vears in my collection. 

 They were, I believe, obtained by Mr. W. S. Atkinson." 



Crtptaustenia motongensis, n. sp. (Plate CXIX. figs. 2-2 c; 

 Plate CXXIl. figs. 6, 6 a, 6 h.) 



Localittf. Moyong, N.W. Khasi (G.-A.). 



Shell depressedly conoid, finely perforate ; sculpture none, the 

 epidermis with a surface like fine paper, distant shallow ti'ansverse 

 hnes of growth; colour ochraceous ; spire low, blunt on apex; 

 suture moderately impressed ; whoi'ls 4, rather rapidly increasing, 

 the last tumid and rounded ; aperture oblique, widely lunate ; 

 cohimellar margin not thickened and just i-eliected near the 

 umbilicus. 



Size: maj. diam. 13-5, min. 11*75; alt. axis 5-75 mm. 



In a specimen received from Mr. Gude, tlie dried up animal w as 

 soaked out, showing it to be pale-coloured, streaked and mottled 

 sparingly with black. The left shell-lobe (Plate CXXII. fig. 6) 

 had a central pale line, with bi'anches similar to what is seen in 

 Euaustenia cassida, it is triangular in shape on a broad base, nar- 

 rowing on the right and left, the right shell-lobe is broad ; both 

 expanding over the shell would cover the greater part of it in 

 life. 



The genitalia (fig. 6 a) were seen : the male organ is quite a 

 simple sheath joined at the retractor muscle by the vas deferens ; 

 the spermatheca short ; the amatorial organ very elongate, with 

 a long well-defined point (fig. 6 h). 



The radula has the formula: 



80 . 2 . 12 . 1 . 12 . 2 . 80 

 or 94 . 1 . 94. 



Ceyptaustekia silcharensis, G.-A. (Plate CXXV. figs. 1, 1 «.) 

 Moll. Ind. ii. p. 170; Faun. Brit. Ind., Moll. p. 186. 



Loadity. Silcuri, CvichviX {J.Wood-Mason). Coll. Indian Museum, 

 Calcutta. 



Shell not perforate, very tumidly globose, thin ; sculpture none ; 

 colour pale ochraceous, with a greenish tint ; spire very fiat with 

 rounded apex ; suture impressed ; whorls 4, rapidly increasing, 



