THE NAUTILUS. 
93 
the individual, 1 in which case we have an example of environment 
modifying the germ-plasm —the odds against the variation being 
only accidentally coincident with the changed environment being 
enormous. 
In 1889, the above-mentioned changes had taken place in the 
colony, but time was needed to show whether they would increase 
in number and degree; or whether, as seemed more probable, the 
old European varieties would eventually assert themselves, and 
swamp the rest. In either case, the result would be very interest¬ 
ing, and now that five years have elapsed, it is extremely desirable 
that someone should make a new investigation and report in detail. 
It is really astonishing chat no one has yet done so. The colony 
was, in 1889, so evidently in a condition of unstable equilibrium, 
that it seems certain that changes must have occurred in the inter¬ 
val, tending to the predominance either of the old or the new (split- 
band) type. 
Believing that Prof. Morrison would publish, I did not follow my 
paper of 1889 with further observations, but it will be as well now 
to put the following on record : 
(1) Lexington, Va., received from Morrison one of each of the 
following, Oct. 26, 1889 : 
Helix nemoralis mut. guettardia Moq. 
Helix nemoralis mut. arcelinia Loc. 
Helix nemoralis mut. petiveria 10345 = requienia Moq. 
Helix nemoralis mut. libellula 1(234)5 Ivregl. 
Helix nemoralis mut. libellula 123( 4 4)5 nov. 
Helix nemoralis mut. libellula 00 30 5 Ckll. (juv.). 
Helix nemoralis mut. libellula 12 3 45 Ckll. 
Helix nemoralis mut. libellula l 2 23 x (45) nov. (juv.). 
Helix nemoralis mut. libellula 12 3 3(45) nov. (juv.). 
(Morrison had another example.) 
Helix nemoralis mut. libellula 12 3 3( 44 4)5 nov. 
(Morrison had another example.) 
Helix nemoralis mut. libellula j 0 3 45 nov. (juv.). 
Helix nemoralis mut. libellula 12 X 3 X 45 nov. (juv.). 
Helix nemoralis mut. libellula ,2o4(5 5 ) nov. (juv.). 
Helix nemoralis mut. libellula 128 3 45 nov. 
Helix nemoralis mut. libellula 12 XX 3 XX 45 nov. 
Helix nemoralis mut. libellula 0 03 4 5 Ckll. 
1 If so acquired, it must be in very early life, as, in many instances, the vari¬ 
ations were recorded from immature examples. 
