36 MOLLUSCA OF SOMERSET. 
and fourth bands are rarely seen. The form (12345), var. 
coalita of some authors, is locally frequent in the county, 
especially on the oolite hills. 
The four-banded group comprises many rare forms, espe- 
cially rare are those without the fifth band, indeed of the 
eight formule in which it is missing, only one, 12340, is at 
present known to science. The most frequent forms are 
10345 and 12045, which are common in many parts of the 
county. I have taken 02345 at Bratton St. Maur and other 
places. According to Taylor 0(2345), (12)305 and 1(23)05 
are reported from Germany and have not been met with in 
Britain; one half of the twenty-eight formule belonging to 
this group are as yet quite unknown, and many of the recorded 
fourteen are very rare. 
In the three-banded group, ten of the twenty-five formule 
are as yet quite unknown, and several others are very rare. 
The most frequent form seems to be 10045 ; I have taken it 
at Bratton St. Maur and Milton Clevedon. I have also 
obtained 003(45) and 100(45) at the former place. Taylor 
observes concerning the formule 003(45) that it “is found 
in Germany and France, but is reported only from this 
country by Mr. C. D. Heginbotham and Mr. Swanton,” and 
adds that “100(45) is quite scarce, being reported only by 
Mr. J. F. Musham and Mr. Swanton.” 
The majority of the recorded forms of the two-banded group 
are rare, and four of the fourteen formule are as yet un- 
recorded or unknown. The forms more usually met with are 
00045 and 10005 ; both have been found in hedge-banks about 
Bratton St. Maur and Milton Clevedon. The only repre- 
sentative of this group which still remains to be recorded for 
Britain is 0(23)00. 
The five forms of the one-banded group are all rare. The 
most frequently observed is 00300 ; I have taken it at Brat- 
ton St. Maur, Milton Clevedon and Rimpton. The very rare 
10000 occurred once at Bratton St. Maur. I observed an 
immature specimen (second British record) of 02000 on a wall 
at Kewstoke in 1910. I have taken two immature examples 
of 00040 and three adult 00005 at Bratton St. Maur. 
The bandless form, 00000, is very common; yellow forms 
being by far the most abundant throughout the country. 
The unicolorous type of coloration is more frequent in /Z. 
hortensis than in Hd. nemoralis. 
