30S JOURNAL OF CONCHOI.OGV, VOL. 12, NO. II, JULY, I909. 



Acicula lineata (Drapamaud). — Raincliffe, one; Hackness, 

 Yedniandale, Forge Valley, not uncommon. Occurs on moss, dead 

 wood, and under stones buried rather deeply in the ground. 



Neritina fluviatilis (Linne'). — Derwent from Ayton to Yeding- 

 ham, scarce. 



Unio pictorum (Linn^). — River Hertford in company with 

 A?iodonfa, in proportion of 4 per cent, of Unio to 96 per cent, of 

 Afiodonta. 



Unio tumidus Retzius. — Dead shells recently from turf near 

 Irton, probably the site of ponds belonging to the monks. The 

 molluscs had been dead many years. 



Anodonta cygnasa (Linn^). — Scarborough Mere, small but fine, 

 and with clean epidermis ; common in the Valley pond, River Hert- 

 ford, Everley. 



var. anatina Linn(^. — Abundant in Scalby Cut and River Hert- 

 ford. A small form occurs in Rurniston Beck, 

 var. arenaria Schroter. — River Hertford. 



Sphaerium corneum (Linne). — Abundant in Scarborough Mere 

 and adjoining ditches, Carrs from Folkton to Seamer, Cayton Bay, 

 Wyngate. 



Sphaerium lacustre (Miiller). — Well distributed, but not com- 

 mon. Scarborough Mere and ponds, Buvniston, Suffield, Cloughton. 



Pisidium amnicum (Miiller). — Abundant. Scalby Cut, Derwent 

 at Ayton, ditch at Canton, Burniston Beck, millrace between Bur- 

 niston and Cloughton. 



Pisidium subtruncatum Malm. — Near Wykeham, fine ; ditch 

 at Flixton, Hackness, by Scarborough Mere, Carnelian Bay, Throxenby. 



Pisidium pusillum (Gmelin). — Common in Lady Edith's Drive, 

 Stepney Hill, Folkton Carrs, Scarborough Mere, Wyngate, ditches at 

 Cayton, cliffs in South Bay. 



Pisidium nitidum Jenyns. — Rare, Folkton Carrs. 



Pisidium obtusale Pfeiffer. — Near Flixton, Oct., 1896, rare. 



Pisidium gassiesianum Dupuy. — Formerl) very abundant in 

 a pond on Burniston Road, now exterminated. 



Phytia myosotis Diap. in Westmorland. — The shells of Phytia 7>iyosotti 

 shewn at the April meeting were found in August, 1907, at Lower Meathop, 

 Westmorland. They are fairly common at the roots of grasses growing on the edges 

 of the narrow channels on the marsh, near tlie eastern bank of the River Winster. — 

 G, H. Taylor {Read before the Society, April 14th, 1909). 



