ADDITIONS TO THE LIST OF RECENT MIDDLESEX MOLLUSCA. 



By J. E. Cooper. 



Read lAth November, 1919. 



The following five species may now be added to the list published 

 in these Proceedings, vol. viii, 1909, p. 219 : — 



Helicella itala (L.). Harefield (C. Oldham). 



H. gigaxii, Charp. Harefield (C. Oldham). 



Pseudanodonta elongata, Hoi. Thames at Penton Hook. (Dead 

 shells only.) 



Pisidium personatum, Malm. Several localities. 



P. 'parvulum, Cless. Thames, Twickenham. 



Numerous fresh localities have also been added to the list ; of 

 these the following may be worth putting on record : — 



Vitrea lucida (Drap.). Fortis Green. A few fine examples. 



Punctum pygmceum (Drap.). Hadley Wood. 



Sphyradium edentulum (Drap.). Hadley Wood. An interesting 

 find, as the only recorded Middlesex locality, near Uxbridge, was 

 destroyed long ago. 



Acanthinula aculeata (Miill.). Hadley Wood. 



Helicigona arbustorum (L.). Edmonton (P. B. Jennings). 



Jaminia secale (Drap.). Harefield (P. B. Jennings & C. Oldham), 

 Thus confirming this species as a Middlesex shell. 



Vertigo pygmcea (Drap.). Harefield (P. B. Jennings). 



BaXea perversa (L.). Edmonton (P. B. Jennings ; one dead shell). 



Limncea stagnalis (L.), var. alhida, Jeff. Dawley. 



Planorhis crista (L.), var. Icevigata, Adami. Dawley. 



Physa rivalis (Maton & R.) [ = heterostropha, Say]. Welsh Harp 

 reservoir and River Brent. There is some difference of opinion as 

 to the identity of these shells ; the writer at first considered them 

 to be P. acuta, Drap., but now agrees they are not that species. 

 This record adds another species to the Middlesex list. 



Aplecta hypnorum (L.). South Mimms. 



