ON SOME VARIATIONS IN HELIX ARBUSTORUM. 411 
examined with a lens, however, the seemingly uniform tint 
resolves itself, in the last half whorl, into a series of excessively 
fine, parallel, wavy, spiral bands alternately opaque and clear. 
To take another example, out of twenty-seven specimens from 
Golspie Burn (just south of Brora), two adult and two young 
individuals belong to the rufous type, one of them being the 
darkest coffee-brown coloured example I have seen; two adult 
and eight immature specimens’ are near the normal hue; 
three adult and ten young belong to the fulvous group, of 
which some have a decided greenish tinge, whilst one is straw- 
- coloured. 
In size they also vary greatly, as the following figures giving 
the dimensions in millimetres of some of the adult specimens 
will show. ‘To save repetition the numbers are arranged so as 
to give, (1) altitude, (2) maximum and minimum diameter, (8) 
height and width of the aperture, (4) the number of whorls ; then 
follows the type of colour, and lastly the locality :— 
20. 22x19. 11x11. 6. Olive-green. Rock. 
16. 920>019.. 1b 11; 54... Rufous. vs 
bi 20x V7. {dix 10. . 54. = 5 
eet 17. sitet O. 52, Normal. * 
16. 19x17. .10x 9. 54. Rufous. Golspie Burn. 
i. YO 17. 10ngs5. 54. Normal. 3 
TS. 1917; 10% 10. * Gt. Me 
19. 22x19. 12x11. 54. Fulvous. 3 
te 19X17 7 10 x 10: “5s, " - 
20. 22x20. 12x12. 54. Rufous. Loch Brora. 
16. 20x17. 10x11. 54. of 35 
fo 21 419. ai x 12. 54. Normal. Bs 
Hoe tepedioe | LO x10; 43. 3 a 
18. 20x17. 11x11. 54. Fulvous. }3 
14. 19x17. 10x10. 43. Normal. Tongue. 
The last example quoted is a most remarkable one; the spire 
is not more elevated than in H. cantiana, Montag., and has a 
rather knocked-about appearance, as though it had had a hard 
time of it, which is not unlikely, seeing that it was taken by 
Mr. Baillie in the extreme north of Scotland at Tongue, near 
the sea, and, I am informed, associated with H. ericetoruwm, 
Lister, though to this companionship its depressed state is not 
