VOL. XIX. (3) 
GLOUCESTERSHIRE MOLLUSCA 
231 
Clausilia biplicata (Montagu). Recorded from Gloucester- 
shire East in “ Journal of Conchology.” 
PHYSIDJE. 
Physa fontinalis, var. alba. Jeffreys. Several specimens 
from Nicks’ timber pond, Quedgeley. 
P. heterostropha, Say. This species, which is common in 
North America, has apparently been introduced into this 
country during recent years. It has been reported from several 
places in Lancashire and Staffordshire and also from Aylesbury. 
During the past few years I have taken it at Sharpness Docks, 
at first very sparingly, but latterly much more commonly and 
larger. During the autumn of 1916 I found it in the Canal at 
Packthorn Bridge, near Moreton Valence, and still more re- 
cently in the timber pond at Quedgeley. It is suggested in the 
“ Journal of Conchology,” vol. xiv., p. 178, that the mollusc 
may have been introduced with cotton. If by this is meant 
in the bales, I cannot think it possible, as it is a strictly aquatic 
animal. It is, however, I think, conceivable that it may 
have come in the water ballast taken up at ports whence cotton 
is shipped, and in this connection it may be noted that cotton 
seed is largely imported at Sharpness. 
LIMN^IDiE. 
Amphipeplea glutinosa, Bruguiere. A note referring to 
the occurrence of this interesting form will be found in the 
Proceedings for 1913, vol. xviii., p. 99, but I have introduced 
it here in order that the list might be as complete as possible. 
In the autumn of 1913 some half-dozen specimens were taken 
by Mr E. J. Elliott, of Stroud, and myself from the Thames 
and Severn Canal near Chalford. In the following autumn we 
again visited the locality and found the number enormously in- 
creased, so much so that at one dip I took no fewer than eleven 
specimens. In the autumn of 1915 the mollusc was quite 
scarce again. The strange and unaccountable appearance and 
disappearance of this species has been observed by other con- 
chologists. 
