233 



PORTRAIT OF THE LATE REV. L. J. SHACKLEFORD. 



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[see p. 193. 



Physa acuta Drap. in Middlesex. — Physa acuta Drap. was noticed more 

 than fifty years ago in one of the lily tanks in Kew Gardens, where it has always 

 lived under tropical conditions. There does not appear to be any record of its 

 occurrence in our southern counties in a " natural " habitat except at Aylesbury 

 (as P. hetirostropha in 1916. Journ. of Co7ich., xv., p. 96). This summer it has 

 occurred in great abundance in part of the Welsh Harp reservoir at Hendon, and 

 also in one stretch of the river Brent, about a mile further upstream. It must 

 have lived in both places for some years, as the shells may be collected in all stages 

 of growth.— J. E. Cooper {Read before the Society, Sept. 12th, 1917). 



