THE MARINE FAUNA OF THE HUMBER DISTRICT. 4 1 



*Mya arenaria, Linn. Skeffling to Spurn. Distorted specimens 

 amongst stones on the Den. 



Barnea Candida (Linn.) —Pholas. In clay, Kilnsea Skerries. 

 * Patella vulgata, Linn. The Den. 



Helcion pellucida (Linn.). Kilnsea Skerries. 



Gibbula cineraria (Linn.)= Trochus cinerarius. Holmpton, Kilnsea, 

 Spurn. 



Lacuna crassior (Mont.). Holmpton. 



L. divaricata (Fabr. ). Holmpton. 



*Littorina littorea (Linn.). Well Creek to Spurn ; Kilnsea Skerries. 

 *Z. obtusata (Linn.). Well Creek ; Stone Creek. 

 *L. rudis (Maton). On stones near high-water mark, Saltend to Spurn. 



* Paludestrina ventrosa (Mont.). Brackish ditches. Pools outside the 



bank, Saltend and Easington (sea shore). 



*P. stagnalis (Baster) = Hydrobia ulvce = Rissoa ulvce. In pools and on 

 the foreshore, Saltend, &c. Abundant in zostera pools or on the 

 mud, Skeffling to Spurn. Inland, in a closed ditch, Cherry Cob 

 Sands, and in Cherry Cob Sands drain near the clough. Often 

 found dry on the mud, but never buried in it. 



*[Crepidula fornicata (Linn.)]. Cleethorpes oyster beds. J. R. Hardy. 

 Buccinum undatum, Linn. Kilnsea Skerries ; Hornsea. 



* Purpura lapillus (Linn.). Holmpton ; Kilnsea Skerries ; groynes, 



Spurn ; the Den. 

 Limapontia depressa, Alder & Hancock. On Vaucheria, in pools 

 only reached by exceptional tides, Easington, August, 1902. 

 *Eolis papulosa (Linn.). Well Creek, August, 1901. 



* Alexia denticulata, var. myosotis, Drap. Amongst grass, just below 



high-water mark of average tides, Saltend to Welwick ; in a 

 closed ditch, Cherry Cob Sands ; abundant at the old head of 

 Patrington Haven, August, 1902. 



TUNICATA. 



Cynthia grossularia (Van Beneden). On Gibbula and whelk shells 

 Spurn. 



Additional Note to Foregoing Paper. 



Since the foregoing account was printed, it has been ascertained 

 that the tidal water is periodically admitted into the Winestead Drain 

 as far as the clough of 1839; Alexia, therefore, lives at Patrington 

 Haven under normal conditions. The horizon given for it on the 

 Humber bank is about \o\ feet O.D. (springs rise over 13 feet o.D.) ; 

 this is exceeded in sheltered situations as at Patrington. 



Paludestrina jenkinsi now occurs from Hedon Haven to Lord's 

 Clough, with Limnxa peregra, Planorbis spirorbis, Physa hypnorum, 

 and Pisidium pusillum in water containing chlorides = .77 grams NaCl 

 per litre ; and from Lord's Clough to Marfleet (Mr. T. Stainforth, 

 April 13, 1903), the only shell found, in water containing chlorides = 

 4.8 grams NaCl per litre. — T. Petch. 



