632 MB. A. S. KENXAED AND ME. B. B. WOODWAED ON [vol. lxxix, 



Clausilia ventbicosa Draparnaud. 



Originally recorded from the Pleistocene of Woodston, 1 it has 

 since been recognized from Orton "VVaterville and Apethorpe. 

 Probably the early records of Clausilia biplicata (Montagu) from 

 Grays also realty refer to this species. 



LlMNJEA ATJBICTJLABIA (Linn.). 



The small inflated form so characteristic of the Pleistocene 

 deposits alone occurred. This is quite unknown living in England, 

 although we have seen examples from Germany as var. monnardi 

 Hartmann. 



Limn.ea tbencatttla (Miiller). 



As in all Pleistocene beds, the examples of this species are 

 small ; the large form so common in the Holocene and living is 

 quite unknown in the Pleistocene. 



Paladilhia badiguelt (Bourguignat). 



This species occurred only, and that hut rarely, in Bed Z, though 

 it was common in the Estuarine Bed. From this one might infer 

 that it was a brackish-water f orm, } r et it occurred commonly in the 

 freshwater deposit of Grays, and rarely at Swanscomb, Crayford, 

 and Ilford. The closely-allied form, P. deani Kendall, hitherto 

 only known from Woodston and Orton Waterville also occurred, 

 but its exact horizon is unknown. 



Pseudamnicola CONEUSA (Frauenfeld). 



Hitherto unrecorded from Clacton, it is a rare species in the 

 Pleistocene : Stutton, West Wittering, and Stone being the only 

 other localities. 



BrniYNiA tEjSTACTlata (Linn.). 



The most abundant species in these beds, but none of the 

 examples attain the size of recent and Holocene examples. 



YlVIPABA DILUYIANA (Kuntll). 



Clacton and Swanscomb are the only English localities for this 

 interesting species, which is said to be still living in the South of 

 Russia. This is the Paludina clactonensis S. V. Wood. 2 Though 

 it was found by Mr. Warren only in the Estuarine Bed, we have 

 seen examples which from their condition probably came from 

 Bed /. Judging from the preservation of all the examples, there 

 is a strong probability that they are derivatives from a yet older 

 bed. 



1 Journ. of Conch, vol. xiv (1913) pp. 83 & 89. 



2 ' Monograph of the Crag Mollusea ' 2nd Snppl. p. 69 & pi. i, figs. 4 a & 



4h. 



