HELICID^. 
73 
and Succinea also unite their hyaline eggs into a 
mass with some gelatinous^ matter. The eggs of 
Bulimus obscurus are large, roundish-oval ; those of 
Clausilia nigricans are ovoid, and very large for the 
size of the animal, being nearly as large as the 
mouth of the shells. Those of Balea are large and 
globular. 
The following table is formed from M. Bouchard’s 
observations. The first column exhibits the time of 
laying. No. 1. standing for January ; the second, the 
number of eggs laid at one time; the third, the 
number of days hatching ; the fourth, the number ^ 
of months before the animal arrives at its adult 
age. 
1. 
2. 
3. 
4. 
Helix virgata 
9—10 
40— 60 
15—20 
18—24 
pomatia 
6— 9 
60— 80 
20—30 
13 
arbustorum 
7— 9 
50 
15—20 
15—16 
aspersa 
5-^10 
100—110 
15—30 
13 
nemoralis - 
5—10 
50— 80 
15—20 
11—13 
hortensis - 
5—10 
50— 80 
15—20 
11—13 
carthusiana 
- 
60— 80 
13—15 
10—11 
cantiana 
7— 8 
60— 90 
14—15 
11 
fusca 
9—10 
40— 50 
20 
10—12 
pulchella - 
7— 9 
10— 20 
15—20 
12 
hispida 
4— 9 
40— 50 
15 
15—16 
rufescens - 
7—10 
40— 50 
20—25 
11—14 
ericetorum - 
7—11 
40— 60 
20 
18 
caperata 
7—10 
35— 40 
15—20 
12 
rotundata - 
5— 9 
20— 30 
13-20 
12 
Zonites nitidiis - 
3— 9 
30— 50 
15—16 
14 
Vitrina pellucida- 
9—11 
8— 15 
15—20 
8—10 
Succinea putris - 
5— 9 
50— 70 
14—15 
11—12 
Bulimus obscurus - 
5— 9 
12— 15 
15 
13 
Clausilia nigricans 
~ 
10— 12 
18—20 
22—24 
Balea fragilis 
7— 9 
12— 15 
15—20 
12 
