42 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Table 5. — Time of spawning of the lobster in Vineyard Sound and vicinity in 1891. 
No. 
1 
2 
3 
4 
5 
6 
7 
8 
9, 10 
11-13 
14-16 
17-21 
22 
23 
24 
25, 26 
27 
28 
29,30 
31 
32 
33 
34 
35,36 
37,38 
Locality. 
Date of 
capture. 
Gay Head 
.do 
Menemsha 
do 
July 19 
July 23 
July 28 
July 29 
. ..do ... 
Aug. 5 
do 
Woods Hole Harbor . . 
Gay Head 
‘.do 
Aug. 8 
Aug. 11 
do 
Menemsha 
Woods Hole Harbor . . 
do 
Gay Head 
.do 
do 
Aug. 12 
Aug. 12 
Aug. 18 
Aug. 19 
Aug. 21 
do 
Stage of development. 
Yolk segmentation 
Close of yolk segmentation 
Invagination 
Late stage •with eye pigment 
Close of yolk segmentation 
do . 
Eye pigment formed 
Egg nauplius 
Invagination (?) 
do 
Close of yolk segmentation 
Egg nauplios 
Late stage, eye pigment conspicuous. 
Before formation of eye pigment 
Invagination 
Thoracic abdominal plate 
Egg nauplius 
Post-nauplius stage 
Early egg nauplius : 
Invagination 
Egg nauplius, late stage 
Eggs tree in ripe ovary . 
; nauplius, late stage. 
Eye pigment, forms large, nearly oval spot 
Egg nauplius 
Age of embryo. 
Date of 
extrusion 
of eggs. 
ljdays 
July 17 
3 days 
July 20 
4 daj r s 
July 24 
29 days 
June 29 
3 days 
July 25 
3 days 
July 26 
27 days 
July 2 
15 days 
July 14 
4days 
Aug. 1 
4days 
Do. 
3 days 
Aug. 2 
15 days 
July 21 
30 days 
July 6 
25 days 
July 14 
4days 
Aug. 7 
8days 
Aug. 3 
15 days 
July 27 
20 days 
July 22 
10 days 
Aug. 2 
4 days 
Aug. 8 
16 days 
Aug. 2 
18 days 
Aug. 3 
42 days 
July 10 
15 days 
Aug. 6 
Table 6. — Time of spawning of the lobster in Vineyard Sound in 1892 and 1893. 
No. 
1 
2 
3 
4 
5 
6 
7 
8 
1-3 
4 
Locality. 
Date of 
capture. 
Woods Hole Harbor . . 
1892. 
July 29 
July 30 
Aug. 1 
. . .do . . . . 
Aug. 3 
do 
do .... 
Aug. 6 
1893. 
July 25 
Aug. 11 
Aug. 15 
Woods Hole Harbor . . 
do 
Stage of development. 
Ago of embryo. 
Beginning of yolk segmentation 
li days - 
About 1 day 
New eggs : stage not determined 
Eggs laid in aquarium at United States 
Fish Commission station. 
Five pairs of appendages behind mandi- 
bles ; no eye pigment. 
23 days 
Date of 
extrusion 
of eggs. 
July 25 
July 15 
July 31 
July 28 
July 31 
July 14 
J uly 8 
Aug. 5 
About 
Aug. 10 
Aug. 12 
July 23 
Table 7. — Variation in time of spamming of lobsters in Vineyard Sound and vicinity in the years 1889-93. 
Period of spawning. 
1889. 
1890. 
1891. 
1892. 
1893. 
Total. 
16-30 
5 
1 
6 
July 1-15 
14 
11 
6 
3 
34 
16-31 
1 
62 
12 
4 
1 
80 
13 
18 
i 
2 
34 
16-31 
1 
1 
20 
86 
38 
8 
3 
155 
Tlie data afforded by the preceding tables lead ns to conclude that the summer 
eggs are produced in this region during a period of about nine weeks, extending from 
the middle of June to the middle or last of August, the largest number being laid 
