236 MK. A. S. E£2^]S"AED AND ME. B. B. WOODWAED [June I 9 I 2, 



from one locality in Tyrol, one in Sweden, and two in Germany, its 

 northern limit being the isotherm of 12° C. In a fossil state the 

 variety genesii is known from the Pleistocene of Mosbach, from 

 several localities in the ' loess ' of Germany, from two Holocene 

 deposits in Germany and one in Sweden. In these islands it is only 

 known from the Holocene of Elie (Pifeshire) and from a deposit 

 of uncertain age at Stamford (Lincolnshire). This last, where the 

 species was common, is probably of late Pleistocene age.^ 



Jamii^ia muscoeum (Linn.). 



This is the most abundant form in the deposit and a Holarctic 

 species, the limit of which in Iceland is the isotherm of 8° C. ; in 

 Norway, Sweden, and Finland the isotherm of 8° to 10° C. ; and 

 in Siberia the isotherm of 12° C. ; while in the Alps its vertical 

 limit is the isotherm of 6° to 7° C. There is great variation in 

 the examples of this species, but a certain number may well be 

 referred to the var. Jundstrosmi West, now living in Iceland and 

 Sweden. This variety also occurs in the Pleistocene of Crayford, 

 SwaleclifF, and Ightham (Kent) ; Fordingbridge and Fisherton 

 (Wiltshire) ; West Wittering (Sussex) ; Barnwell (Cambridgeshire) ; 

 and Stamford (Lincolnshire). It is also a common form in the loess 

 of Germany, 



LiMNJEA PEEEGEE (MtUl.). 



A single dwarfed example is referred to this polymorphic species. 

 Identical shells are in our collection from the Pleistocene of 

 Crayford (Kent), the Holocene of Hale Moss (Westmorland), 

 Silverdale (Lancashire), and Perranporth (Cornwall). In Iceland 

 its limit is the isotherm of 8° C; in Norway, Sweden, and Finland 

 8° to 10° C. ; and in Siberia 10° to 12° C. ; while in the Alps its 

 vertical limit is 4° to 5° C. 



LiMN^A PALUSTEis (Mull.). (PI. XVII, figs. 3 a & 3 6.) 



This species is represented by three dwarfed examples. It is a 

 Holarctic form, the limit of which in Norway is the isotherm of 

 14° C. ; in Sweden 10° to 12° C; in Finland 8° to 10°; while in 

 the Alps its vertical limit is 13° to 14° C. 



These shells may be looked upon as a dwarf form of the variety 

 turricula Held., and identical shells are in our collection from the 

 Pleistocene of Chelmsford (Essex), St. James's Square, Westminster 

 (Middlesex), and Barnwell (Cambridgeshire), Benkendorf, Eegens- 

 burg, Stuttgart, and Osterrode in G-ermany, all of which are late 

 Pleistocene in age. 



LlMN^A TEUNCATULA (Mlill). (PI. XYII^ figs. 4 a & 4 6.) 



Not uncommon, about twenty examples having been obtained ; 

 all of them are small. 



' See Proc. Malac. Soc. vol. vii (1906) pp. 119-20. 



