172 HULL SCIENTIFIC AND FIELD NATURALISTS CLUB. 



Pisidium milium Held. 

 Occurs in several localities, but is never common. 



Holderness. — Beverley, ditch in Long Lane, near Beverley Minster, 

 sparingly (J.D.B. 3). Hornsea Mere (J.D.B. 2; 3rd circular 1881 ; 

 Y.N.U. 1881 ; F.W.F. Fretwell's Guide and circular 150). Burstwick, 

 ditch on road to Burton Pidsea ; Withernsea, pond on cliff ; 

 Burstwick drain ; brickpond near Sproatley (T.P.). 



[Dreissensia polymorpha (Pall.). 



The record quoted in Kew's " Dispersal of Shells," p. 

 218 — " in many places in the canal between Manchester and 

 Hull ' (T. Brown, " Illustrations," 1844, p. 76) — is, of course, 

 an error as far as regards Hull, since the canal terminates 

 at Goole.] 



ADDENDA. 



Records initialled E. P.B. were taken from the proof of 

 Mr. Blackburn's paper ; in the published list (" Naturalist," 

 Dec, 1904) the following also occur : — 



Hyalinia radiatula (Wolds) Kelleythorpe. 



Helix rotundata (Wolds) King's Mill, Driffield. 



Helix pygmcea (Wolds) Tibthorpe Wold. 



Helix aculeata. Delete " Tibthorpe Chalk Pit." 



Helix pulchella (Wolds) Scarborough Road, Driffield. 



Helix pulchella var. costata (Wolds) Tibthorpe Wold Chalk Pit. 



Helix cantiana (Wolds) Flamborough ; Bridlington. 



Vertigo pygmcea (Wolds) Tibthorpe. 



Ceeciloides acicula (Wolds) Tibthorpe Chalk Pit. 



Planorbis nautileus (Holderness) Foston and Hornsea. 



Planorbis corneus (Wolds) Kellythorpe. 



Planorbis contortus (Holderness) fairly common. 



Limncea palustris (Wolds) Kelleythorpe. 



Pisidium amnicum (Holderness) Driffield vice " Fairly distributed." 



Pisidium fontinale (Wolds) Tibthorpe Wold. (Holderness) Driffield ; 



Rotsea ; Beeford ; Skipsea. 

 Pisidium pulchellum (Holderness) Lowthorpe ; Beeford ; Skipsea ; 



Hornsea. 

 Pisidium cinereum (Holderness) Rotsea and Foston. 

 Pisidium pusillum (Wolds) Tibthorpe Wold ; (Holderness) Driffield ; 



Foston ; Rotsea ; Hornsea. 

 Pisidium nitidum (Wolds) Tibthorpe Wold ; Kelleythorpe. (Holderness) 



Skerne ; Beeford ; Skipsea. 

 Pisidium milium (Wolds) Tibthorpe Wold. (Holderness) Driffield ; 



Skerne ; Lowthorpe ; Hornsea. 



From the Skipsea lacustrine deposit Mr. Blackburn records Bithynia 

 tentaculata, B. leachii, Limncea peregra, Valvata piscinalis, V. cristata, 

 Spharium corneum, Pisidium pusillum, P. nitidum, P. roseum, and 

 P. fontinale. 



