PLANORBIS. [as 
Var. I. rhdmbea (Turt.). Smaller, more solid, more 
convex above and more concave below. 
Var. Il. albima(Jef.). Whitish. 
Monst. snzstrérsum (Taylor). Sinistral. 
Sub-genus.—Corttus Adamson. 
10. P. CORNEUS (horn-celoured) Linné. Pl. VI., f. 10. 
Very tumid, sfzve sunk; opaque dark horn-colour, lighter 
below ; south nearly circular; whorls 5 to 6. A. 85 mm. B. 
25 mm. 
This species is unmistakable both from its size and 
shape. It is far the largest of our British /Vanorves. 
The young are covered with spiral rows of small hairs. 
Its recorded range in England extends from Hampshire 
to the north of Yorkshire. Though found locally in 
Ireland, there are no records for Wales or Scotland. 
have taken specimens with four marks shewing stages 
of growth, which, if formed only once a season, imply 
that these individuals were in their fifth year. 
To preserve the hispid appearance of young specimens. 
I can recommend their preservation in a little bottle or 
tube of pure glycerine. 
On being plunged into boiling water the animal will 
sometimes diffuse a crimson fluid resembling that secreted 
by V. contecta. 
Var. albina (Mog.). Shell white. 
