THE CONCHOLOGIST, 



51 



THE LAND AND FRESHWATER MOLLUSCA 

 OF OXFORDSHIRE. 



By \V. K. Coi.i.inc.e. 



LIMN Ai [DM. 

 PLANORBIS, Gnett. 



Planorbis fontanus, Lightfoot. 

 --= nil id lis, Auctt. 

 Local and not at all plentiful. 



1. Banbury. — Very scarce on tlie River 



Cherwell (Pidgeon, 1875), (Stretch, 

 1855)- 



2. O.xford. — Two or three specimens in a 



ditch in Ghristchurch Meadow (Nor- 

 man, 1853). Rather rare (S. Spencer 

 Pearce, 1883). 



Planorbis nautileus, T.. 



Sparingly met with in the Cherwell near 

 Banbury and adjacent ponds. The Rev. 

 S. Spencer Pearce in 1883 also recorded it 

 from tlie canal between Wolvercot and 

 Oxford. 



Planorbis albus, Miill. 

 Not an uncommon species, but by no 

 • means plentiful. 



1. Banbury. — River Cherwell (Pidgeon, 



1875)- 



2. Deddington. — Few specimens in ponds. 



5. Bicester.— Two or three specimens from 



ditch near Bicester. 



6. Oxford. — Not common (Norman, 1853). 



Rather rare (Dalton, 1855). Sparingly 

 though generally distril)uted (S. Spen. 

 cer Pearce, 18S3). 



Planorbis spirorbis, Miill. 

 Somewhat local, but genernlly met with in 

 arg e numbers. 



I. Banbury. — (Stretch, 1855). Scarce in the 



Canal. (Pidgeon, 1S75). Plentiful in 



the River Cherwell. 

 6. Oxford. — Ditch at the side of Cowley 



Marsh (Norman, 1853), (Dalton, 1855). 



Plentiful in ditches (S. Spencer Pearce, 



1883). 



Planorbis vortex, L. 



A common and generally distributed species. 



Planorbis carinatus, Mull. 



Plentiful and well distributed, preferring 

 ponds and ditches to the rivers. 



Var. disciformis, Jeff. 

 6. Oxford.— J.G. J., B.C. 



Planorbis umbilicatus, Miill. 

 = coi/iplanatiis, Auctt. 

 Abundant throughout the county. 



Planorbis corneus, I-. 



Abundant and well distrilnited : very fine 

 in some parts of the county. 



Planorbis contortus, L. 



Well distributed, but not plentiful. 



PHYSA. 



Physa fontinalis, L. 



A common and well-distributed form. 



Physa hypnorum, I-. 

 Very local. 

 r. Banbury.— River Cherwell very scarce 



(Pidgeon, 1875). 

 6. Oxford —Very local (Norman, 1853), 



(Dalton, 1855). Locally abundant (S. 



Spencer Pearce. 1883). 



