328 



THE PISIDIA OF GUERNSEY AND SARK: 



By J. R. LE B. TOMLIN, M.A. 

 (Read before the Society, April gth, igig). 



Messrs. Stelfox, , Oldham and Phillips have kindly examined a 

 number of gatherings of Pisidia from these two islands for me with 

 the following results. Mr. Overton has been good enough to allow 

 me to include several records of gatherings made by himself, which 

 have been verified by the same three experts : — 



Guernsey. 

 P. subtruncatum Malm. 



Near Japanese House and King's Mills (Overton) ; Grand Mare, 

 stream running into Perelle Bay, quarry at Portinfer, Vrangue mill- 

 pond, Ivy Castle, and douit close to the Sports Ground. 

 P. personatum Malm. 



King's Mills (Overton) ; stream in the Petit Bot valley, wet ground 

 on the cliffs near the Corbiere and above the Creux Mahie, cattle- 

 trough at Pleinmont and the Vrangue mill-pond. 

 P. casertanum Woodward. 



Petit Bot valley, cattle-trough at Pleinmont, cliffs near Pleinmont 

 and near the Corbiere, Grande Mare, Vrangue mill-pond, douit close 

 to the Sports Ground and pool near Fort Doyle. 

 P. nitidum Jenyns. 



Near Japanese House and King's Mills (Overton) ; stream running 

 into Perelle Bay, waterhole on the cliffs near Pleinmont, Grande Mare, 

 quarry pond at Portinfer (" some exceptionally large " — C. O.), 

 Vrangue mill-pond, streams round Ivy Castle and douit near the 

 Sports Ground. 

 P. obtusale Pfeiffer. 



Streams round Ivy Castle, quarry pond at Mont Cuet, marshy 

 ground near Fort Doyle. 

 P. milium Held. 



Near Japanese House (Overton) ; Grande Mare, quarry on Lan- 

 cresse Common (" narrow and elongated, young shells perhaps flatter 

 than usual," A.W.S.), Vrangue mill-pond, streams round Ivy Castle. 



Sark. 

 P. personatum Malm, (very fine shells," A.W.S.) 

 P. casertanum Woodward. 



A batch taken in 1884 from the muddy, weedy pond which used 

 to exist above the harbour, consists of these two species. All the 

 shells from this pond were encrusted with a ferruginous deposit and 

 were erroneously recorded as F. roseum {/. of C. i. 321) and as 

 P. pusillum {/. of. C. iv. 271, x. 294). P. personatum occurred also 

 in September, 192 1, in a cattle-trough in gravelly mud, just below 

 the Vicarage. 



