HYALINIA. ay | 
It is slightly more local than Jura, notably in Wales, 
and it is never abundant as is often the case with pura. 
It is found in all the four provinces of Ireland and has 
recently been added to the Manx list. 
Var. viridescéntt-élba (Jeff.). Greenish white. 
72 ity PURAs(acar) Alders PETE, f 9: 
Compressed, very thin, pearly white ; faintly striated in the line of 
growth and still more faintly longitudinally ; whorls 4 ; mouth nearly 
circular ; wmb¢licus narrow but deep. A. If mm. B. 32 mm, 
Animal cream colour. 
This delicate little species extends from end to end of 
Great Britain, but is not found everywhere. 
In the ‘Journal of Conchology,’ Vol. VII., p. 151, 
Messrs. Standen and Nelson point out conclusively that 
the white form is the type that Alder named pura (doubt- 
less from its clear pearly appearance). and that he regarded 
the brown form as a variety. Though Alder did not 
give a special name to the brown form, it seems to have 
been known to his contemporaries as zz¢:dosa. 
At present it is only locally known in Ireland, though 
I found it very plentifully in the north, the white form 
very considerably preponderating. In Scotland also this 
is said to be the case. In the Midlands I have taken 
about an equal proportion of the type to the variety, and 
I have observed the same equality in the west of England 
and in Kent. 
Var. ttiddsa (Gray). Pale horn colour. 
