~ 
HELICIDA. 35 
peripheral band are, as a rule, uncommon in both species. 
Rarely six or more bands occur. There are eighty-nine pos- 
parery Peer : 8 
sible variations when the bands are not in excess of five. 
HELIX NEMORALIS. 
The commonest representatives of the five-banded group (16 
forms in. all) are 12345, (123)(45) and (12)3(45). Somewhat 
rare or more local forms are (12345), 1(23)(45), (12)345, 
(123)45, and 123(45). I have observed all of the above in 
Somerset. It is noteworthy that 12(34)5 has been recorded 
only from Germany, Belgium, and Virginia, U.S.A 
The four-banded group (28 forms) contains a large propor- 
tion of rare formule ; there are only three that may be con- 
sidered at all common, vzz., 10345, 12045, and 02344, all occur 
in Somerset. The rare (1234)0, (12)340, (123)40, (12)(34)0, 
(12)305, and 12(34)0 are recorded only from Germany, the 
remaining forms have occurred in Britain, but I am not aware 
that any of them have been observed in this county. 
The three-banded group (25 forms) contains four that are 
recorded from Germany only, viz., (123)00, (12)040, (12)005, 
and 02(34)0. These rare continental forms oad be carefully 
searched for by Somerset conchologists. The most abundant 
representative of the group in this « country is 00345. I have 
seen it in many places. ‘T’wo forms, 100(45) and 0(234)0, are 
said to be peculiar to Britain (I have taken the latter at 
Milton Clevedon), the remaining seventeen are very rare. 
The two-banded group (14 forms) comprises chiefly rare 
forms. The more commonly piacere are 000(45), 10300, 
00304 and 00340. I have taken all of these in the Milton 
Clevedon district. The formula (12)000 is known only from 
Germany, and 02040 only from Britain. The remainder are 
all rare. 
The one-banded group contains only five forms, viz., 10000, 
02000, 00300, 00040, 00005 ; of these 00300 alone is common, 
00040 and 00005 are uncommon in Britain, and 10000 and 
02000 are rare. I have observed 00300 commonly in this 
county, and 00005 only once, at Burnham. 
The bandless form, 00000, is very common in Britain and 
on the Continent. 
HELIX HORTENSIS. 
Of the five-banded group, the most frequent forms in Somer- 
set are 12345, (123)(45) and (12)3(45). Forms with coalesced 
second and third bands are uncommon, and coalesced third 
