34 MOLLUSCA OF SOMERSET. 
Var. rufozonata, Cockerell. 
Bridgwater; W. Vinson. 
Bruton; C. D. Heginbotham. 
Var. arenicola, Macgillivray. 
Frequent in the Wincanton, Bruton and Castle Cary 
districts ! 
Rimpton ! 
Blagdon ; Miss Hele. 
Portishead ; Miss Wilmot. 
Flax’ Bourton; ‘ew. WV. £2 Eyre: 
Var. trochoidea, Clessin. 
Sub-var. contca. Bratton St. Maur! 
Mon. sinistrorsum. 
Recorded by J. W. Taylor as “ Found by Miss F. M. Hele 
at Coombe Dingle, near Bristol, and by Miss Jessie Hele 
at Keynsham, N. Somerset. Both were of an uniform 
yellow colour” (Journ. Conch., 1883, p. 35). Sporadic 
sinistrorsity is of very rare occurrence. Mr. John Taylor 
remarks (Monograph, I, p. 108) that “a sinistral race of 
Helix nemoralis, almost analogous to that formerly ex- 
istent of Fusus antiquus, would appear to have at one 
time lived in county Donegal, as the very numerous 
subfossil shells picked out of the immense sandhills 
about Bundoran abundantly testify.” Sinistral shells 
from this locality may be seen in many museums. 
Notes on the shell banding in H. nemoralis and H. hortensis. 
There is great variability in the banding of these species. 
Herr Georg von Martens, many years ago, devised a very con- 
venient method of recording the variation in the number of 
bands, which is now almost universally adopted. 
Normally five bands are present, these are indicated by the 
formula 1, 2,3, 4,5; 1 being the uppermost, 5 the lowest band, 
that nearest to the umbilicus. If a band is missing a cypher, 0, 
takes its place ; thus, 00300 indicates that the third or peripheral 
band alone is present. Bandless forms are indicated by five 
cyphers, 00000. 
Coalesced bands are enclosed in parenthesis, thus 123(495) 
indicates that the fourth and fifth bands are fused. Bandless 
forms predominate in both species. It is curious that the form 
00300 so common observed in //. nemoralis is of very rare oc- 
currence in //. hortensis ; forms with complete absence of the 
