KENDAM, : rLEISTOCENE MOLl.USCA IN NORTH HUNTINGUONSHIRE. Sg 



We think, therefore, we may safely adopt this identification. 

 There is a sHght difference in size but when we remember the protean 

 nature of this group of shells, the mere fact that the Pleistocene form 

 is rather smaller than recent European examples seems a matter of 

 very little importance. Mr. Collier's specimens of the var. alpicola 

 from the Tyrol measure 4 mm. in height and 6'o8 to 6"2 7 mm. in 

 diameter. The AVoodston fossils give — altitude 3 '31 mm., diameter 

 5 "86 mm. Mr. Kennard has kindly sent me specimens from the 

 Pleistocene deposits at Crayford in Kent, and Barnwell, near Cam- 

 bridge, which both Mr. Dean and myself find similar in all respects 

 to the Woodston shells. The habitat of this species to-day is Switzer- 

 land, the Tyrolese i\lps, France, S. Germany, and N. Italy. 



3. Clausilia (Pirostoma) ventricosa Draparnaud. 



So far two specimens of this northern species have occurred in 

 the Woodston deposit. Unfortunately owing to their slender build 

 the Clausilias seem the most fragile of shells, though fragments of 

 them, especially the apices, are extremely plentiful. I have only been 

 able to obtain about ten perfect specimens of the genus, but I hope 

 that further search may result in a few more perfect examples being 

 added to those which I have already collected. This species was 

 named for me by Mr. J. D. Dean, by comparison with some recent 

 examples in his collection obtained from the KinnekuUe Mountains 

 in Southern Sweden (see Journ. of Conch., vol. xiii., p. 356) with 

 which the fossil shells are absolutely identical. This identification 

 has since been confirmed by Mr. Kennard, so I have no hesitation in 

 claiming for this species a place in the British List. 



Clausilia ventricosa Drap. is an exceedingly handsome shell, the 

 finest of the Pirostoma section of the genus. Its range according to 

 Westerlund is throughout North and Mid-Europe. 



The finest of the fossil shells from Woodston is 15 mm. in altitude 

 and 4*23 mm. in diameter. 



4. Clausilia (Pirostoma) parvula Studer. 



Although so far only one specimen has occurred, this is quite 

 perfect, and the record is important as still further showing the 

 western range in Pleistocene times of the genus Pirostoma. In this 

 connection it should be noted that there is absent from these lists 

 altogether the familiar bidentata Strom, of the present day, its nearest 

 ally. Clausilia parvula is, however, a well-known continental species 

 Avith a wide range throughout Alpine Europe, and is a familiar member 

 of the Swiss fauna. Length 1 1 mm. 



5. Clausilia (Pirostoma) pumila Ziegler. 



This interesting species occurs in considerable numbers in the 

 deposit at Woodston. It is extinct in Britain but has been recorded 



