2 70 JOURNAL OF CONCHOLOGY. 



PHYSA ACUTA (Drp.) IN SCOTLAND. 



By a. J. JENKINS, AT.C.S. 



(Read before the Conchological Society, Nov. 5th, iSgo). 



Mr. J. W. Williams has described this continental species in 

 'Land and Freshwater Shells,' p. 69, as inhabiting 'one of the 

 lily tanks in Kew Gardens.' 



Having lately discovered that Physa acuta Drp. may be 

 taken from two other localities in Britain, perhaps a few notes 

 respecting them may interest members of the Society. 



In March of the present year, my friend Mr. L. O. Grocock, 

 M.C.S., and myself, had the good fortune to obtain several 

 P. acuta from tanks in hot-houses at the gardens of the Royal 

 Botanical Society in Regents Park. 



We first noticed them in the hot-house devoted to the 

 propagation of the young seedlings of Victoria regia, crawling 

 about the sides and edge of the tank containing them, and 

 upon the under-side of the leaves of the young plants. We 

 also found them rather abundant in glass vessels and tanks 

 of growing Vallisneria spiralis and other aquatic plants in two 

 other hot-houses. 



Early in September I had the opportunity of seeing a 

 number of shells oi P. acuta in the possession of my friend, Mr. 

 W. D. Rae, who is an ardent conchologist. They had been 

 collected by Mr. Rae from mill ponds at Aberdeen some time 

 before. Being interested in the discovery of what I believed to 

 be a new locality for this introduced species, I asked for further 

 information respecting them. Mr. Rae assured me that he first 

 collected this species about July, 1887, from three or four 

 ponds situated in grounds belonging to the Banner Mills Co., 

 at Aberdeen, The mill, which is a substantial granite structure, 



J.C., vi., Oct., 1890. 



