aiOLLUSCA OF INDIA, 247 



thin, translucent, smooth, pale horny ; spire conoidal, suture 

 impressed ; whorls 5|, convex, the last much largei', broadlj 

 rounded at the periphery and tumid beneath ; aperture oblique, 

 roundly lunate, about as broad as high ; peristome thin, in one 

 plane, columellar margin vertical and triangularly reflected above. 



"Maj. diain. 12, min. 10|, height 7 mm. 



" Hah. Kulu. 



" This is near M. glauca and M. mida, but distinguished by its 

 much more open perforation and rounder mouth." 



It attains a much larger size than the above. A large series (67 

 in number) in all stages of growth were sent home from the Indian 

 Museum Collection, bv Dr. N. Annandaie, to be identified. The 

 largest measures 15-25 x 13-25 x 7-5 mm. Only six were fully 

 grown, 15 x 14 mm. ; the usual size is 12-14 mm. major diam., a 

 good many only reach 9 mm. Most of these are a dingy white with 

 a thin epidermis partly lost and peeling off. Among them were six 

 of an umber-brown colour, and these show indistiuct transverse pale 

 lines of colour on the apical whorls. Three contained the dried 

 up animal and were put to soak, and i-evealed far more than I had 

 anticipated. The animal had no markings, the mucous gland at 

 extremity of the foot has a hooked overhanging lobe. The 

 peripodial margin and grooves broad. The right shell-lobe 

 moderately long, the left small. The genitalia were not in a 

 satisfactory state to see all the detail. The male organ was only 

 made out in one specimen, and in that the usual caecum near the 

 retractor muscle was not present, but it had possibly been broken 

 off. The amatorial organ was large and thickened. Spermato- 

 phores were present in the spermatheca of tw'o of the specimens ; 

 one I figure (Plate CXXIX. fig. 7) has a very long capsule with 

 a flume of about same length, having a three-pointed spine 

 near base of the capsule, and further back the edge is set with 

 single spines at regular intervals. 



The radula has teeth of the usual Macrochlamys type, the 

 marginal being nearly evenly bicuspid and v^ry small on the 

 extreme edge, arranged : — 



50 . 2 . 14 . 1 . 14 . 2 . 50 

 or 66 . 1 . QQ. 



The jaw is arched with a central projection. 



Macrochlamys masoni, n. sp. (Plate CXXXI. fig. 6.) 



Locality. Saharunpur, N.W. Provinces. Indian Museum, 

 Calcutta, ex coll. J. AVood-Mason. 



Shell perforate, globosely conoid, rounded below and on 

 periphery, raf her solid ; sculpture none, a perfectly smooth surface ; 

 colour dull whitish ; spire conic, raised, in a second specimen very 

 much so ; suture well imj)ressed ; whorls 6, regularly increasing ; 

 aperture semioval, subvertical ; columellar margin suboblique, 

 reflected close up to the umbilicus. 



Size : maj. diam. 12-75, min. 11-27 ; alt. axis 6-0 mm., of the 

 2nd sp. 68 mm. 



