PROCEEDINGS COTTESWOLD CLUB 
1917 
VALVATID-ffi. 
Valvata piscinalis, var. antiqua, Sow. This variety, which 
is more elevated than the type, occurs in considerable numbers 
in Nicks’ timber pond at Quedgeley. 
NERITIDiE. 
Neretina fluviatilis, var. trifasciata, Colbeau. 
N. fluviatilis, var. nigrescens, Colbeau. Both of these 
varieties occur at Sharpness Docks with the ordinary form. 
UNIONID-ffl. 
Unio tumidus, var. ponderosa. Pascal. Old Docks, 
Sharpness. 
Anodonta anatina. Linne. In the former hst this form 
was described as A. cygncea var. anatina. It is now, however, 
accorded specific rank, and is therefore given here. It occurs 
plentifully in the Canal at Hempsted, in the timber pond at 
Monkmeadow, and also at Sharpness. 
OYRENIDiE. 
Sphaerium corneum, var. pisidioides, Gray. This variety 
— considered by Dr. Gray to be a distinct species — has occurred 
in fair numbers in the Gloucester and Berkeley Canal near the 
Gas Works. 
S. pallidum, Gray. In the former list this is stated to be 
rare at Sharpness. It appears to have increased rapidly as it 
is now quite abundant and very large. I have it also from the 
Gloucester and Berkeley canal near the Gloucester Gas Works. 
Pisidium henslowianum (Shepp). Common in Nicks’ tim- 
ber pond, Quedgeley. 
P. milium, Held. In pond near Midland Station, Stone- 
house. 
