460 Mr. W. T. Blanford on the Classification of 



the tube opens externally in the peristome itself. Now, there is 

 a small variety of Streptaulits Blanfordi (which perhaps has 

 claims to specific distinction) in which precisely the same takes 

 place, the tube not running backwards along the suture, but 

 opening in the peristome. In no character of the shell can 

 Streptaulm be considered to agree with Alycans ; nor, I think, 

 can a generic separation from Raphaulus be founded upon the 

 very slight variation in the sutural tube, in the course of which 

 there is quite as great a diversity between R. chrysallis and R. 

 bombycinus as between either of these and Streptaulus ; and if 

 the distinction be preserved, it must be founded upon another 

 character. Such a character is presented by the form of Strep- 

 taulus, which, in place of being flattened ventrally, and having 

 the upper whorls distorted as in Raphaulus, has all regular as 

 in Pupina. But I doubt if this character alone be of more than 

 subgeneric value, and I should therefore conclude that the pre- 

 sent type is a subgenus of Raphaulus, and that it tends to con- 

 nect that genus, not with Alyccms, but with Pupina. 



I regret that I have not noted the animal of Streptaulus. It 

 is probably similar to that of Raphaulus. Should the soft tube 

 leading to the air-chamber prove to be wanting, there will be 

 better grounds for generic distinction. 



18. Pupina, Vign. 



Only four species of this form are known from Burma and 

 the neighbouring countries, viz, : — 



P. imbricifera, Bens. Khasi Hills. 



P. artata, Bens. Molmain. 



P. arula, Bens. Molmain. 



P. Peguensis, Bens. Eastern Pegu. 



P. artata also occurs in Arakan and throughout the Irrawaddy 

 valley as far north as Ava. It is a somewhat variable shell — one 

 variety, from the neighbourhood of Prome and Thayet Myo, 

 being somewhat more globose than the type, and having a rich 

 orange peristome. 



No member of this genus has yet been found upon the Hima- 

 layas, where Streptaulus alone represents the group, the mem- 

 bers of which diminish greatly in number towards the north. 



The animal possesses no peculiarities. It is almost colourless, 

 with short tentacles and distinct black eyes at the base, a mode- 

 rate oval foot with the sole undivided, and short proboscis. It 

 differs from Cyclophorus and its allies only in the shorter and 

 less subulate tentacles and rounder foot. 



19. Hybocystis, Bens. 

 The animal of H. gravida, Bens., is similar to that oi Pupina-, 



