•278 LASTD AND FllESIIWATER 



CKTPTAFSTE^fiA BENSONI, Pfi'., vav. (Plate CXXIII. figs. 10, 

 10 a ; Plate CXXIV. figs. 5, 5 «, 5 6.) 



Locallt)/. Rajmahal (Indian Museum collector, N. Annandule, 

 31.vii.l9b7). 



Shell is much more globose and not so flat on the spire as in 

 C. silcharensis, G.-A., Vol. 11. 1907, p. 170, PL CVII. figs. 1-6 c 

 (shell, animal, & anatomy). 



The type shell described by Pfeiffer was from the Botanical 

 Gardens, Calcutta; the shell refei-red to by me in Vol. I. p. 150, 

 I obtained in Jessore a few miles east of Calcutta, it is figured 

 on Plate XXXVI. figs. 7, 7«. I have now been able to obtaiii, 

 through the kindness of Dr. Is. Annandale, specimens from 

 Eajmahal, some 180 miles up the Gauges delta from Calcutta. 

 The animal from this locality is very much mottled with black 

 particularly on the extremity of the foot and the left shell-lobe, 

 much more so than in the Calcutta specimens I have seen. The 

 form of the shell varies also, vide Plate CXXIII. figs. 10, 10 a; 

 this may be noticed in the apex, in the coil of the whorls, and in 

 its more globose shape. It is not at all like C. j^^Kinclietensiss 

 G.-A,, from Eanigunj, which may be considered a variety of 

 hensoni. The genitalia of C. hensoni were not described in Vol. I., 

 this I am now able to supply. They are similar to those of 

 Cr]iptcmstenia succinea, the type of the genus. 



The animal (PI. CXXIV. fig. 5), compared with C. silcharensis, 

 has the extremity of the foot more pointed and overhanging; it is 

 much more speckled as well as the shell-iobes, these are not so 

 coarsely papillate, the right shell-lobe is finely papillate; individuals 

 dilfer in the extent of the speckling. There are three perijyodud 

 fjrooves. The branchial sac is mottled and spotted. The right 

 dorsal lobe small, finely papillate ; the left narrow, not divided. 

 The left shell-lobe (fig. 5 a) narrow on the front side, I'apidly 

 widening on the left side, it is streaked and spotted black on a 

 white ground. 



Genitalia (fig. 5 h) : The male organ has a short thickened 

 epiphallus, no kale-sac ; the retractor muscle, given off at the 

 bend or head of the organ, is very long ; the spermatheca is short 

 and globose ; the ainatorial organ remarkably long and large for 

 the size of the animal, and its shape differs much from that of 

 C. silcharensis. 



Ceyptaustenia salius, Bs. 



Moll. Ind., Vol. I. 1883, p. 15l>, Plate XXXVII. fig. 1; id. 

 A^ol. 11. 18!)8, p. Go. 



Paun. Brit. Ind., Moll. p. 217. 



Although Dr. W. T. Blanford included this species in the genus 

 Danjella iu the last quoted work, on oijinious 1 expressed, I think 



