TAYLOR : GUERNSEY AND SARK MOLLUSCA. 275 



Helix Pisana Miill. — The apparent dwarfing of Guernsey 

 shells is again shewn in this species, the two specimens 

 from Vazon Bay sent by Mr. Tomlin are only lo mill, high 

 and 15 mill broad, the typical dimensions being 12^ mill. 

 X 17^ mill. The ground colour is buff, darker beneath, 

 with numerous fine but irregularly broken spiral lines, 

 embryonal whorls are purplish black. There is scarcely a 

 trace of pink at the aperture. 



Helix rupestris Drap.- — A single specimen of this species 

 was sent, rather under the normal size ; its dimensions 

 were : diam. 2^ mill., alt. 1^ mill. 



Bulimus acutus (Miill.). — The single specimen sent is 4^ 

 mill, in diam., and ii^'3 mill, in length, has 8^ whorls, is 

 of a dull buff or ochreous ground colour, with a few trans- 

 verse dark-brown streaks which appear by transmitted light 

 transparent and colourless. The embryonal whorls are 

 simply horny, with markings. 



Pupa umbilicata Drap. — The two specimens are of normal 

 size as given by Dr. Jeffreys ; the reflected lip is flesh- 

 coloured. 



ClausiMa rugosa (Drap.). — These specimens vary a little in 

 size and ventricosity, and have twelve whorls, the average 

 size being 12 mill, by 3 mill, in diameter. Jeffreys gives 

 the dimensions as 12 j4 niill. x 3^ mill. 



C. rugosa var. gracilior Jeff. — One specimen may be referred 

 to this variety ; it has the whorl more than usual and is 

 13^ mill, long by 2^^ mill, in diameter. To be strictly 

 characteristic the dimensions should be about 14 mill, x 

 2)^ mill. 



Cochlicopa lubrica (Miill.). — The two examples of this 

 species are again smaller than usual, the outer lip is of a 

 pale colour, and the size is 2 mill, x 51^ mill. 



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