170 HULL SCIENTIFIC AND FIELD NATURALISTS CLUB. 



Holderness. — Beverley district, local and not plentiful ; small at Fig-ham 

 in a ditch bordering on the Hull Road ; also in a ditch running into 

 the R. Hull at Commonbank Nook, near Arram (J.D.B. 3). Hornsea 

 (H. Strickland, Forbes and Hanley, 2, p. 118). Hornsea Mere 

 (Y.N.U. 1881 ; F.W.F. Fretwell's Guide and circular 150). Withern- 

 sea (F.W.F. circular 99). Spring Dyke, Hull (J.D.B. 1). Saltend 

 Common, cattlepond (T.P., Trans. I., p. 104). Marfieet ; Burstwick 

 drain; Waxholme ; Patrington ; Sproatley ; not uncommon (T. P.). 

 Form approaching Pallidum, Burstwick Drain (T.P.). Rotsea 

 (E.P.B.). 



Var. ryckholtii (Norm.) : — Pond, near Danes Dyke House (Y.N.U. 1886 ; 

 F.W.F. circular 116). 



Subfossil. Skipsea (Phillips, 1875, p. 80, not in 1829 ; C. Reid, p. 79, 

 from Phillips). 



Pisidium amnicum (Mull.). 



Derwentland. — York (S.W.N.) ; fairly common in the Ouse, (R.M.C.). 

 Wressle, in the Fleetdyke (J. Beanland). 



Holderness. —Driffield, debris from canal (J.D.B. circular 145) ; canal, 

 F.W.F., J. of C. 7, p. 173). Barmston drain ; Leven canal (J.D.B. 1). 

 Locally abundant ; Beverley and Barmston drain, near Arram ; 

 Leven canal; R. Hull at Grovehill (J.D.B. 1). It occurs in the 

 Derwent at Ayton (North Riding) and should be found lower down ; 

 in Holderness it appears to be confined to the valley of the R. Hull 

 (T.P.). Well distributed (E.P.B.). 



Pisidium fontinale (Drap.). 



Derwentland. — Yoik, common (R.M.C.). Wressle, Fleetdyke, on caddis 



cases (G.R.). 

 Wolds.— Filey, cliffs (W.C.H. 2nd circular, 1883 ; Y.N.U. 1903). Speeton 



(T.P. circular 172). Pond near Danes Dyke House (Y.N.U. 1886 ; 



W.C.H. " Flamborough " p. 137). Flamborough (F.W.F. circular 



116). Brough (Y.N.U. 1901). 

 Holderness. — Driffield, debris from canal (J.D.B. circular 145). Beverley 



district; Long Lane ; Figham ; Leven canal; moderately plentiful 



(J.D.B. 3). Withernsea (F.W.F. circular 99). Burstwick drain ; 



Garton ; Dunswell (T.P.). Lambwath Stream at Skirlaugh (T.P.). 

 Subfossil. Hornsea (T.P.; T. Sheppard, Nat. 27, p. 366). 



Pisidium henslowanum (Shepp.), 



Derwentland. — York (S.W.N) ; common in sand diedged from the Ouse 

 (James Backhouse in R.M.C.). 



Holderness. — Leven canal (J.D.B. 1). Leven canal; Barmston drain near 

 Arram ; ditch parallel to Leven canal ; Cottingham ; R. Hull at 

 Grove Hill where its scarcity or abundance appears to be determined 

 by the action of the tides (J.D.B. 3). Hornsea Mere (C. Reid, p. 83 ; 

 T.P. specimens identified by Mr. J. W. Taylor). Lambwath Stream 

 at Skirlaugh (T.P.). 



