52 JOURNAL OF CONCHOLOGY, VOL. 9, NO. 2, APRIL, 1898. 



also extremely abundant in the reservoir of Messrs. Bradbury & Co. 

 Oldham. 



Physa fontinalis (L.) — This delicate species is very common in 

 the canal from end to end. 



I.imnaea peregra (Mull.) — Abundant in every pond and ditch, 

 the prevailing form in the canal being the var. ovata. From among 

 a number of the var. acuminata taken from a well on Fitton Hill, I 

 picked a beautiful scalariform shell. 



L. auricularia (L.) — Very common in the canal at Bardsley in 

 the early spring, but seems to decrease in numbers at the approach of 

 summer, though a few may be taken throughout the year. 



L. stagnalis (L.) — Very abundant in many pits at Parkbridge 

 and Bardsley, and also in the canal there. 



L. palustris (Mull.) — A few decollated specimens in a ditch on 

 Fitton Hill ; common in ponds and ditches in same neighbourhood, 

 and at Parkbridge a form approaching var. elongata occurs. 



L. truncatula (Mull.) — In a swamp on Fitton Hill this species 

 is very abundant, and may also be taken sparingly in moist places in 

 the woods. 



L. glabra (Mull.) — On the reeds in the ditches on Fitton Hill 

 this species is common. 



Ancylus fluviatilis (Mull.) — Very common in the canal at 

 Bardsley. 



Velletia lacustris (L.) — This species occurs in numbers on reeds 

 in most ponds and ditches in the district; very fine specimens are 

 taken from an old disused wharf on the canal beyond Bardsley Bridge. 



Vivipara vivipara (L.) — Common in the Bardsley canal, but 

 not so common nor so fine as formerly ; all the individuals I have 

 taken from this locality have contained young. 



Bythinia tentaculata(L.) — The commonest shell in the Bardsley 

 Canal. It varies considerably from a pure white to a dark-red brown. 



Valvata piscinalis (Mull.) — A few from the canal at Bardsley. 

 It swarms in a small pool at the bottom of Oldham Park ; I was very 

 much surprised to find it there, for the pool is almost full of ashes, 

 old buckets, and other rubbish from the adjoining tip. 



Sphserium COrneum (L.) — Abundant throughout the district in 

 ponds and ditches ; in the canal a light-coloured form occurs, prob- 

 ably var. flavescens. 



S. rivicola (Peach). — This species seems somewhat migratory 

 with us, some years it may be taken in great numbers in the canal 

 at Bardsley, at other times being very scarce. 



