At 
Local Distribution of Colour and Band. 
Formulae in Helix nemoralis. 
C. S. Carter, Loutu. 
Having observed the great contrast in the colour of Helix 
nemoralis on the north and south sides of the Pullover at 
Mablethorpe, I collected all the shells I could find in May, 1900,— 
on the north side May toth, and the south side May 24th. Why 
so great a contrast occurs I do not attempt to explain, but 
simply give the facts. Not only are the climatic conditions, 
but those of vegetation and soils also, practically the same on both 
sides; it is therefore the more remarkable that such differences 
occur. One hundred and forty seven specimens were collected, 
their colour variation and band formule is tabulated as follows :~ 
North side of Pullover. South side of Pullover. 
Band Number of Band Number of 
Formule. Specimens. Formule. Specimens. 
var. castanea 00000, 1] 00000, 3 
12345, 1 
12 3 
var. rubella 12345 1 12345 1 
(123) (45) 2 123(45) 1 
(12545) 1 0:3(45) 1 
00345 1 0:34: 3 
0234: 1 0034: 6 
(::)3(45) 1 00300 3 
00300 1 00000 25 
00000 1 
| 
| 
| 
40 
oO 
