14 



THE CONCHOLOGIST. 



Arion circumscriptus, Johnston. 

 = A. /'ourguignafi, Mabille. 

 A not uncommon form, though I have but 

 (tw records. Mr. W. Denison Roebuck, 

 F.L.S., has on more than one occasion called 

 attention to the fact that this species occurs 

 in open fields and open country, rather than in 

 woods and gardens like the other members 

 of this genus, which I have found to be the 

 case in this county. I have records from all 

 divisions except 3 and 8. 



SUCCINEA, Drap. 



Succinea putris, L. 



This mollusc, which is well distributed 

 throughout the county, is never met with in 

 any large numbers, and as usual, in marshy 

 places. 



Succinea pfeifferi, Rossm. 

 Comparatively rare. It is recorded as rare 

 at Oxford by Norman in the 1853 list. The 

 form that occurs there is the variety rufescens, 

 Cockerell — a reddish shell and shallow suture. 

 Whiteaves (1857) speaking of this shell as 

 a variety of S. putris, says it is very plentiful. 

 I. Banbury. — Stretch (1855). Rare ; few- 

 near Broughton Castle. 

 6. Oxford. — Rare, in a ditch running along 

 the side of Cowley Marsh (Norman, 

 1853). Very plentiful (Whiteaves, 1857). 



Var. pallida, Moq. 

 6. Oxford. — Very plentiful (Whiteaves, 1857). 



Var. rufescens, Cockerell. 

 6. Oxford. — Rare, in ditches. 



Succinea elegans, Risso. 

 I have only two records for this pretty shell. 

 In 1887 I collected three specimens on the 

 banks of the Churvvell, near Banbury, and in 

 the same year I obtained four or five from 

 Oxford. 



YITRINA, Drap. 



Vitrina pellucida, Miill. 



This beautiful mollusc is a common and 

 well distributed form in the county. In Nor- 

 man's list of 1853, it is recorded as "very 

 rare " in the Oxford district, a statement 

 which cannot at all hold good to-day, as 

 it is as common there now as elsewhere. 



As I elsewhere stated, this mollusc is much 

 more plentiful in the winter months than 

 the summer. " Gray observed that 1'. fellitdda 

 possesses the power of jumping an inch or 

 two from the ground. I have observed that 

 when crawling on the edge of some stone or 

 leafless twig, it will sometimes suddenly give 

 its tail a jerk, sufficient to throw shell and 

 owner to the ground, where it is soon lost to 

 sight amongst surrounding vegetation, at other 

 times it will roll away a few inches and 

 repeat the jumping motion. Another means 

 of protection it possesses is that of attaching 

 to itself bits of leaves or soil, which entirely 

 cover the shell and animal, thus causing it 

 to resemble the natural surroundings."* 



HVALINA, Fer. 



Hyalina draparnaldi, Beck. 



Occasionally met with, but rare. I am 

 informed that it has been found near Oxford, 

 but have not seen the specimens. Norman, 

 in his list of 1853, recorded what he thought 

 to be a variety of Ily. radiatula taken in 

 Magdalen Walks, which I think may possibly 

 have been this species. 



7. Swincomb. — Three specimens near 

 Swincomb. 



Hyalina cellaria, Miill. 

 A very common and plentiful species, 

 occurring profusely throughout the county. 



{To he coiifi'iiticd.) 



" Obs. on W pellucida. Zool., p. 467. 18 



