592 Records of fhc Indian Museum. [Vol. XXII, 



We retain this species as distinct provisionally for the animal 

 and raduU are very like those of A. [F.) verruca ^ a species also 

 found in Ceylon, and we are not entirely convinced that it may 

 not be simply a very old phase of the latter species, perhaps only 

 attained occasionally. Much smaller specimens of A. (F.) verruca 

 are sexually mature, but this does not preclude the possibilit}" we 

 have suggested. 



Ancylus (Ferrissia) baconi, Bourguignat. 



1882. Ancyliis bacuni, Clessin, in Marl, .ind Cheni.. Condi. -Cab.. 

 Ancylinen, p. 61, pi. vii. fio-. y. 



Among the specimens assigned by Nevill to A. verruca, we 

 find a small series from Orissa that differs considerably from 

 shells of that species and agrees well with Clessin's figure and with 

 the original description of A. baconi. The species was originally 

 described from Bengal and has since been recorded from the Philip- 

 pines and Japan. 



The following observation is interesting as illustrating a 

 possible mode of dispersion. Some years ago one of us captured 

 in the canal at Cuttack in Orissa a large Dysticid beetle the 

 elytra of which were covered with a species of Ancylus in consi- 

 derable numbers. The specimens were sent to the late Dr. Gwat- 

 kin and were apparently lost in transit. We are unable to say 

 whether they belonged to this species or some other. 



Ancylus (Ferrissia) tenuis, Bourguignat. 



1862. Ancylus tenuis, Bourguignat, Spic. Mai., p. 208. 



No figure of this species appears to have been published but 

 large numbers of specimens that agree with the original descrip- 

 tion were recently found by one of us in small streams at the 

 base of the Nilgiri Hills, from which the species was originally 

 described. The specimens from South India assigned by Nevill 

 to A. (F.) verruca are similar, but seem to have been completely 

 bleached. 



The species probably differs somewhat in habits from other 

 Indian representatives of the genus. It was found on dead leaves 

 in the pools of small hill-streams, specially those just above water- 

 falls. 



THE AMPHIBIOUS PULMONATA (SUCCINEIDAE). 



By Amin-ud-Din. 



Genus Succinea, Drap. 



The Indian species of Succinea, so far as our knowledge ex- 

 tends, seem to fall both anatomically and biologically into two 

 groups ; but no separation between these groups can be based 

 on the shell-characters. Until we know more of the anatomy 



