No. 384-] SHELL OF HELIX NEMORALIS. 919 
Next to band fusion the most common variation is that of 
band 2, which varies in 10% of the shells. Band 3 is much less 
variable; band 1 but slightly variable, except in conjunction 
with band 2. (In series “G,” band 1 almost equals band 2 in 
variability.) Band 4 and band 5 vary very rarely, except when 
four or all five bands disappear. 
In series “A” and “B” 10% of the shells belong to the 
group where band 3 alone is left unchanged ; these are chiefly 
00300, and it is here the variety rubella is principally found. 
The plain shells, or those with only rudiments of bands, run 
about 4%, and show the chief color variations. 
In all the above the tendencies of variation are similar to 
those in Europe, and the chief varieties are all known in 
Europe. 
More peculiar is the splitting of bands already considered, 
and the presence of extra bands which cannot be ascribed to 
any of the common bands. Here the presence of a band 
between 3 and 4 is most frequent (about 4%), while a band 
between 2 and 3 is not at all uncommon. Other extra bands 
are very rare. 
As regards variation in different localities, a decided differ- 
ence is apparent. Little experience is needed to recognize a 
handful of the shells from Mrs. Moore’s garden, their original 
habitat. The chief differences are three: (a) the almost com- 
plete absence of any variety except /zbe//ula. Series “ C” con- 
tains one specimen of var. rubella 00300, and Mrs. Moore has 
in her possession three or four rubella 00000, which probably 
were picked up in her garden. I have seen nothing else from 
there except “be//ula. (b) The almost complete absence of 
formula 00300, which makes up about 10% in my garden and 
is very abundant everywhere else. (c) The great tendency to 
fusion of bands, as is shown by Table IV. It should be men- 
tioned that a large proportion of the “C” shells seem to have 
been injured and repaired, and this seems to interfere with the 
development of band 1, and may account for the higher per- 
centage of variation in band 1 of this series. No reason is 
apparent why shells from this locality should be more injured 
than those of other localities, and the injury may be only 
