330 THE ZOOLOGIST. 



B. Leachii, Sheppard. — Local and rather scarce. Found in 

 the railway lake near Wolvercot, and according to Mr. Whiteaves, 

 " on mud on banks of Isis, opposite the island in Portmeadow, 

 on the towing-path side." 



Fam. III. Valvatid^. 



Valvata piscinalis, Muller. — Abundant in places, though not 

 generally diffused ; in tbe canal, ditches running into tbe Cherwell, 

 near Summertown Ferry. 



V. cristata, Muller. — Not plentiful about Oxford, though more 

 widely diffused than piscinalis. I have taken it near Ferry Hincksey 

 and Portmeadow. Mr. Whiteaves gives as localities " Yarnton, 

 near Summertown, and near Watereaton." 



*j 



Order Pulmonobraxchiata. 

 Fam. I. LiMNiEiDJ3. 



Planorbis nitidus, Muller. — Rather rare; in a ditch near 

 Ferry Hincksey. Mr. Whiteaves took it in tbe lake at Wol- 

 vercot. 



P. nautdcus, Linn. — Rather rare ; amongst rushes along the 

 edges of the canal between Wolvercot and Oxford. The shells are 

 fragile, with the costse but moderately pronounced. This is an 

 addition to the vicinity of Oxford. 



P. albus, Muller. — Sparingly, though generally distributed; 

 on water-lilly leaves in the Isis just above Godstow Bridge ; canal- 

 banks near Wolvercot. Mr. Whiteaves' localities are " the ditch 

 round Cbristchurch Meadow, near Yarnton (this locality I can 

 confirm), near AVatereaton, and near Summertown. P. glaber, 

 the near ally of this species, so far as I know, has not yet been 

 found near Oxford. 



P. sjnrorbis, Muller. — Plentiful, in ditches, &c. 



P. vortex, Linn. — Rather more plentiful than the last-named 

 species, with which it is generally found. 



P. carinatus, Muller. — Local, though generally plentiful where 

 found ; lake at Wolvercot, ditches near Cherwell River, and near 

 the ferry at North Hincksey. 



P. marginatus, Drap. — Very abundant; in almost every piece 

 of water. 



P. comens, Linn. — Plentiful in most of the ditches in the 



