340 JOURNAL or CONCHOI-OGY, VOL. I3, NO. II, JULY, I9I2. 



Valvata cristata Miill. — One adult and one immature ; both 

 dead shells. 



In several parts of the Ouse we have found living Atiodonta with 

 live specimens of Dreisseiisia attached to the shell, sometimes as 

 many as five or six full-grown specimens crowded together. Recently 

 Mr. J. E. Cooper noted the " unusual association " of Velletia laaistris 

 and Ancylus fiuviatilis on water-lily leaves {J. of C, vol. xiii., p. 273). 

 These species are to be found living together on stems of water-plants 

 in the river at Bedford ; but V. hcustt-is is by far the more numerous 

 of the two. 



Paludestrina jenkinsi in Hampshire. — Pahidestrina jenkinsi does not apj^ear 

 to have been recorded hitherto for South Hampshire. It occurs in its customary 

 abundance in the marsh ditches at Stanjiit near Christchurch. Of some hundreds 

 of specimens which I examined at that place on .September 3rd, 1911, all were of 

 the non-carinated form. — Charles Oldham {Read before the Society, April lOth, 

 1912). 



Limax cinereo-niger in Westerness. — At the end of September, 191 1, I 

 took some half-grown examplc-s of Limax ciiiereo-niger on fungi in the birch forest 

 at Fort Augustus. They were associated with Arion aler, A. interinedins, and 

 A. siih/iiscKs var. fnliginea. — Charles Oldham (Read before the Society, 

 April loth, 1912). 



Variation in Littorina litorea L.— Red Wharf Baylies on the east coast of 

 Anglesey. It consists of a three mile stretch of sand quite free from rocks except 

 at either extremity. Near the centre of this bay, just where a stream flows out, 

 there is a large colony of Littorina litorea living on the open sand, and along the 

 edge of a bed of pebbles. The shells are small and much eroded. The erosion is 

 probably due to the influence of the fresh-water to which they are periodically 

 exposed, and also to the ravages of a small boring sponge. The average weight of 

 an adult shell is only two grains, and the average height f ths of an inch. Just two 

 miles away, at the eastern extremity of the bay, where this species obtains shelter 

 on the rocks, it attains a large size. The average weight of an adult shell here is 

 II grains — fine specimens attain I2| grains, and measure if inches in height— a 

 .striking contrast to their dwarfed relatives out on the open sand.— J. E. CooPER 

 {Read before the Society, March 13th, 1912). 



