52 



THE CONCHOLOGIST. 



LIMN/^IiA, Lam. 



Limnaea glutinosa, Miill. 



Dalton (1855) records a single specimen 

 from a ditch at South Hinksey. 



Limnaea peregra, AKill. 



Abundant throughout the county. 



Var. ovata, Drap. 

 I. Banbury. — Occasionally fouml in the 

 canal. 



6. Oxford. — A ditch near West Hinksey 

 (Norman, 1853). Common, of large 

 size in the canal (S. Spencer Pearce, 

 r883). 



Var. acuminata, Jeff. 

 6. Oxford. — (Norman, 1853), (S. Spencer 

 Pearce, 1883) 



Var. lineata, Bean. 

 I. Banbury. — (Stretch, 1S55). 



Limnaea auricularia, L. 



Common, and well distributed. 



Limnaea stagnalis, L. 



Abundant, and well distributed. 



Var. fragilis, L. 

 A common form. 



Limnaea palustris, Miili. 

 Well distributed throughout the county. 



Limnaea truncatula, Miill. 

 Very common, and well distriljuted. Thomas 

 has well described its habits and habitat in 

 Quar. Journ. Micro. Sci., vol, xxiii., 1883. 



Limnaea glabra, Miill. 



6. Oxfor 1. — Ditch near Kenningtoii, rare 

 (Dalton, 1855). 



ANCYLUS, Geoff. 



Ancylus fluviatilis, Miill, 



Not at all plentiful, but well distributed. 

 In Gray's edition of Tui ton's Manual (1848), 

 on page 248, it is stated that "these animals 

 sometimes swim about on the surface of the 

 water like Limnnsi, with their backs down- 

 wards." I have never seen either of the 

 members of this genus float, and I have 

 turned hundreds into the position described, 

 and have alwa)s found that if in sinking 

 they did not resume their normal position, 

 they all, without exce[)tion, died. 



Ancylus lacustris, L. 



More [plentiful than the preceding species, 

 but not so widely distributed. 



ADDENDA. 



Limax cinereo-niger, Wolf 



Var. verus, D. & M. 



(Young specimen). 



Limax marginatus, Miill 



= L. arbon/ii/, B-Cli. 

 Var. nemorosus, Bandon. 

 (Three specimens). 



Mr. Cockerell informs me that " there are 

 in the British Museum four slugs from near 

 Oxford, collected by A. M. Norman " as 

 above. 



LIST OK WRITING.S ON OXFORD.SHIRE 

 MOLLU.SCA REFERRED TO. 



1834. — Strickland, H. E. ".A. List of some 

 Land and Freshwater species of 

 shells which have l)een found in 

 the Neighbourhood of Henle3'-on- 

 Thames." Loudon's Mag. of Nat. 

 Hist., vol. viii., p. 494, 1834. 



