THE YOUNG NATURALIST. 



43 



had the band formulae (1 2 3) 4 5, a few, 1 (2 3) 4 5, not numerous, 1 : 3 

 (4 5), a few 0 2 3 4 5, 0 : 3 4 5 and 1 2 3 (4 5), which last bad aU the 

 bands united at the mouth. 



None of the yellow variety (libellula) were so plentiful, as those with 

 pink-coloured shells. Some were bandless, and others had all five zones 

 present ; some had the first two and the fourth and fifth bands coalescing, 

 while the third one was distinct, and in others the first two and the fourth 

 and fifth nearly coalesced, but were not quite united. Some had all the 

 bands united at the mouth, but round the periphery of the shell the first two 

 were distinct, and the third and fourth coalescing into one broad zone; others 

 — 0 2 3 (4 5) — had the first band wanting, but the second and third distinct 

 and the fourth and fifth united ; and others — 0 (2 3 4 5) had the first band 

 wanting, and all the others coalescing, whilst some — : : .: : : — had every band 

 interrupted, and nearly obliterated. The remainder had the band formulae 

 0 0 3 4 5, 0 : 3 (4 5), : 2 3 4 5, 1 2 3 (4 5) and 1 2 (3 4 5). The last 

 had all the zones united at the mouth. 



Of the brown variety ( castanea ) all the specimens I found had the bands 

 entirely absent, excepting one which showed traces of a whitish band in the 

 position of that distinguished as No. 4. 



It is noteworthy that I found all these forms in a space of ground less than 

 a rood in extent, and all were living in the same conditions and feeding on 

 the same food, ( Salix viminalis ), so that neither the nature of the soil uor 

 the character of their diet could have had any influence in producing these 

 varietal differences. 



Besides Helix memoralis I found numbers of Helix hortensis, but every 

 one was of the yellow form ( lutea ), and with no bands ; not but what this 

 variety often occurs with all five zones plainly marked. Pink specimens too 

 I are found in some cases entire devoid of markings, and in others with the 

 five bands present. The name " incarnata " has been given to varieties of 

 this colour. 



I have found the olive brown form, " olivacea" in Cambridgeshire; the 

 band markings are entirely absent. There are other varieties to which names 

 have been given, which I have not so far met with ; for example, those of a 

 brown or lilac colour (" Simonia " and " Lilacina"), the albino form and the 

 very pretty pink lipped " roseo-labiata" 



I have gossipped so much about Helix memoralis and Helix hortensis 

 that I fear I must leave the consideration of other species for a future paper, 

 as I do not desire to take up too much space. Before I close, however, I 

 should like to mention one or two facts in the history of the wood snail, 

 which have come under my observation, In the first place I notice Helix 



