174 Quarterly Journal of Co7tchology. 



form (C. exiguum, Say ), and although the extreme forms differ, I 

 cannot see any grounds for separating it from C. minimum. 



The grounds for uniting our two species of Cochlicopa in one 

 genus, are as good as those for uniting so many varied forms of 

 Bulimus or Helix, there is no essential difference between these 

 creatures and Bulimus, and it would be proper to place them in that 

 genus, I think, but of course this is a matter of opinion. 



The important malacological difference between Balea and Clau- 

 sula is sufficient warranty for placing them in distinct genera. 



I quite agree with Mr. Simpson touching the two species of 

 Planorbis — co7nplanatus and carinatus. I have often tried, but 

 always failed, to find any grounds for separating them. I also think 

 with him, that the decollation of a shell clearly cannot make it a 

 variety, and I can give undoubted proof that it is produced by 

 circumstances beyond the control of the moUusk. 



Helix virgata monst. sinistrorsa near Pollington. — 



Whilst shell collecting between Goole and Askern, in the beginning 

 of September, 1875, I found amongst others, the following local 

 species. Fine specimens of Helix fusca occurred plentifully on an 

 hedgebank between Snaith and PolHngton. At Balne Moor I 

 found my greatest prize, a perfect, sinistral specimen of Helix vir- 

 gata, as well as a number of Helix caperata of a perfectly white 

 color, some of which were beautifully marked with translucent 

 bands. 



Limnaea peregra var. albida near Askern. — On May 

 15th 1875 whilst engaged in examining the various ponds and 

 ditches situate between Askern and Doncaster, I discovered a 

 number of specimens oi Limn c?a peregra of a very clear white color, 

 they were readily distinguished from the normal form, while in the 

 water, as they appeared to be of a very light bluish-grey color. 

 Dr. Jeffreys to whom I have submitted them says "the Limncea 

 peregra is an interesting (and I believe new) variety corresponding 

 to the variety albida of Limncea auricularia." — Lister Peace, 1875. 



