MOLLUSCS 



II. PROSOBRANCHIATA %% 



Paludeitrina jenkinsi (Smith). Droylsden cnstata, Mull. 



ventrosa (Mont.). Dead specimens, sparingly, Pomatlas elegans (Mttll.). Between Grange and 



at Southport Carnforth 



Bithynia tentaculata (Linn.) Acicula lineata (Drap.). Fleetwood ; Grange ; 



leachii (Shepp.) around Manchester ; Preston 

 Vivipara vivipara (Linn.) Neritina fluviatilis (Linn.) 



B. PELECYPODA 



Drelssensla polymorpha (Pall.) the variety P. obtusale, now held by some 



Unlo plctorum (Linn.) to be a distinct species, is found in a Shell- 



tumidus, Retz. marl. 



margaritifer (Linn.). Gibertson (Alder Collec- Pisidium nitidum, Jenyns. 



tion) ; River Lune at Caton (Dyson) fontlnale (Drap.). Common : the var. Hen- 



Anodonta cygna-a (Linn.) shwiana has been found near Preston and 



Spha-rium rivicola (Leach) near Manchester, and the variety P. pul- 



corneum (Linn.) cbettum occurs in a Shell-marl near Silver- 



ova/e (Fer.) dale. 



lacustre (Mttll.) milittm (Held.). Ikrdsley and neighbour- 

 Pisldium amnicum (Mttll.) hood 



pusillum (Gmel.). Near Silverdale, where also 



99 



