go JOURNAL OF CON'CHOI.OGY, VOL. I4, NO. 3, JULY, I9I3. 



by Mr. B. B. Woodward as fairly common in the gravels of Pleistocene 

 age at Barnwell in the neighbouring county of Cambridge (Proc. 

 (Geological Association, vol. x., no. 7). Its range to-day is throughout 

 Northern and Central Europe, and it has been recorded from Sweden, 

 Denmark, Livonia, Germany, Switzerland, Silesia, Carinthia, Croatia 

 and the Tyrol. The measurements given above of C. pumila are 

 those of A. Schmidt. The fossil shells from Woodston measure 

 1 1 "86 mm. in altitude and 3'45 mm. in diameter. 



6. Paludestrina deani sp. nov. 



Shell cylindrically conic; whorls six, rounded with coarse, 

 irregular and somewhat indistinct striae, slightly truncate at the suture ; 

 suture deep ] apex sharp ; aperture oval, narrow ; inner lip slightly 

 reflected ; umbilical cleft narrow, almost concealed. 



Altitude 8"45 mm. Diameter 3"86 mm. 



Horizon : Woodston, Huntingdonshire, in marls and clays of 

 Pleistocene age. 



This shell, though closely allied to Paludestrina ventfosa Montagu, 

 of which we at first regarded it as an extreme form, seems to 

 possess characteristics sufficient to separate it specifically. All our 

 leading conchologists to whom I have submitted specimens unite in 

 declaring it to be an entirely new species, quite distinguishable from 

 the other members of the genus. It occurs in the greatest profusion 

 throughout the three feet thick deposit of dark estuarine clay which 

 lies just above the shell- bearing lacustrine marls, along with many 

 valves of Cardiuvi ediih and small numbers of Liuincea pereger, 

 Planorbis spiroibis and immature Hygromice. It also occurs, but 

 not nearly so plentifully, in the lower marls. It was evidently as 

 abundant in this Pleistocene estuary as Paludestrina stagnalis Baster 

 is to-day in many similar habitats 



Paludestrina. dcani ii.sp. 

 Types in the Manchester INIuseum. Photo, by J. ]l'ilf rid Jackson. 



I have great pleasure in being permitted to give to this shell the 

 specific name of dea7ii., as a mark of deep gratitude to Mr. John Davy 

 Dean, of Lancaster, one of the most accurate and painstaking of our 

 younger conchologists, who first introduced me to the study of con- 



