26 



Limnsea (Radix) peregra, Mull. Ingleby Greenhow 



(J. H.), Kildale (J H.), Trenholme Bar (J.'H.), Ingleby 

 Arnclifte (J. H. ), Beck between Thornaby and Middles- 

 brough (A. Hann), Skelton (B. H.), Staithes (B. H.). 

 Very common. 



var. ovata, Drap. Ingleby Greenhow (J. H.). 



Limnsea (Limnophysa) stagnalis, L. I have specimens 



from the collection of the late J. Watson, of Ingleby 

 Greenhow, obtained about 1857, and labelled as having 

 been found at Stokesley. Dixon and Watson say : — 

 " We have found it abundantly in the South of Durham 

 and North of Yorkshire." 



Limnsea (Limnophysa) truncatula, Mull. Ingleby 



Greenhow (J. H.), Kildale (J. H. ), Kirkby-in-Cleveland 

 (J. H.), Easby (B. E. L.), Great Ay ton (B. R. L,), 

 Ormesby (T. A. L.), Coatham (T. A.. L.), Mulgrave 

 (W. D. R. ). 



Limnsea (Omphiscola) g-labra, Mull. Kirkby-in-Cleve- 

 land (J. H.), Great Broughton (B. R. L.). 



Planorbis (Hippeutis) fontanus, Lightfoot (P. mudus, 



Jeff.). Potto (B. R. L), Acklam (B. R. L.). 



Planorbis (Gypaulus) nautileus, L. Ingleby Green- 

 how (J. H.), Trenholme Bar (J. H.), Marton (B. R. L.), 

 Acklam (T.A L.), Coatham (T. A. L.), Wilton (B. R. L.). 

 var. crista. L. Trenholme Bar (J. H.). 



Planorbis (Gypaulus) albus. Mull. Stokesley (B. R. L.), 



Trenholme Bar (J. H.), Acklam (B. R. L.). 



Planorbis (Gyrorbis) Spirorbis, Mull. Kirkby-in-Cleve- 

 land (J. H.), Great Ayton (B. R. L.), Acklam (B. R. L.). 



Planorbis (Gyrorbis) vortex, L Acklam (T. A. L.), 



Middlesbrough Park (T. A. L ), Coatham (T. A. L.). 

 Planorbis (Gyrorbis) umbilicatus, Mull. (P. complan- 



ahis, Jeff.). Acklam (T. A. L.), Coatham Marshes (D. F.). 



Planorbis (Bathyomphalus) contortus, L. Trenholme 



Bar (J. H.). 



Bullinus hypnorum, L. Kirkby-in-Cleveland (J. H.), 

 Ingleby Arnclifte (J. H.), Coatham Marshes (B. R. L.). 



Physa fontinalis, L Marton (B. R. L.), Middlesbrough 

 Park (T. A. L.), Beck between Thornaby and Middles- 

 brough (A. Hann', Acklam (B.R.L.), Coatham (T. A. L.), 

 Coatham INIarshes (D. F.). 



