Hyatt.] 
88 
[November 3, 
tried several expedients to make them retract, without actually 
touching them. The spinous ribs on the outer flajis or the tail 
were also quite hard. Whenever pressed or bent in the shell 
immediately resumed its former surface, showing great elasticity. 
The dark reddish brown of the rings, carapax and claws 
had changed and an under-tint of green was perceptible. The 
bases of the spines, teeth on the large claws were red as before, 
but the crowns and points had become whitened. The teeth 
yielded at the bases, however, when jmessed, as did also the largest 
spines. The teeth on the smaller claws were in the same condi- 
tion as the spines. 
2.15 p. m., no change observed. 
8 p. m., a hardly perceptible difference of the shell of the 
joints of the tail and a slightly greater freedom of motion 
was observed. The spines, teeth of the claws, rostrum, etc., were 
in same condition as in the morning. Mandibles and mouth parts 
not examined. 
July 23, opened tank at 8.45 a. m., and found our lobster 
dead. The shell and all the parts were slightly changed. The 
surface was slightly rougher or more granular to the touch, and 
slightly tougher, the legs stiffer, and also the rostrum, though all 
were still pliable and papery. 
I judged from these facts that death had occurred early in the 
morning, since the changes were about the same in amount as 
those noticed as having occurred during the first night. 
Mr. Samuel Henshaw and the author made careful measure- 
ments in English inches as follows : — 
Measurement of Lobster and the Moulted Shell. 
Lobster. 
Shell. 
Differ' e. 
a 
Around the big claw just behind the jaws (right.) 
7 9 
'l6 
fi- 4 _ 
u 16 
ItV 
a 
“ “ “ “ (left.) 
Kl 3 
°16 
5 
1 3 
16 
a 
“ carapax between 2d and 3d pr. legs lO^g- 
J® 
QO 
9 1 
z 16 
c 
Length of big claw, (left.) 
Fill 
°16 
K 5 
°16 
Q 
c 
u “ (right.) 
S12 
°16 
K 6 
°16 
6 
16 
c 
“ long joint, big claw, 1st pair legs, 
9 1 _ 
Z 16 
112 
1 1 6 
5 
16 
b 
Breadth of outer jaw (right claw.) 
2-6- 
"16 
l- 8 - 
1 t6 
14 
16 
b 
“ “ “ (left “ ) 
1_6_ 
X 16 
l- 2 - 
x 16 
JL 
16 
b 
“ 2d joint of tail counting from carapax 
41 0 
6 
4_8_ 
*16 
2 
1 6 
