1880.] 
1880.] 
89 
[Hyatt. 
c Len 
gth of 
longer antennae beyond first joints 
llio 
xx 16 
8 
31a. 
°16 
c 
£4 
rostrum 
1 _ 8 _ 
x 1 6 
1 16 
3 
1 6 
c 
« 
carapax from eye sockets 
410 
*16 
4 _l_ 
* 1 6 
9 
1 6 
c 
££ 
abdomen from end of telson 
7- 8 - 
‘ 16 
71 3 
' 31 ? 
3 
ZZ 
c 
££ 
1st ring of abdomen counting from 
carapax 
1 5 
16 
13 
16 
2 
16 
c 
U 
2d ring of abdomen 
1 _ 8 _ 
X 1 6 
15 
x 3 2 
11 
32 
c 
« 
3d-4th “ “ 
l- 3 - 
X 1 6 
l- 2 - 
x 16 
1 
16 
c 
££ 
5th-6th “ “ 
1 _ 4 _ 
X 1 6 
31 
TZ 
9 
3 Z 
c 
<£ 
telson 
114 
X 1 6 
1 _ 8 _ 
x 1 6 
6 
16 
The dimensions of bulk marked (a) when added up and reduced 
bear the following proportions. If the shell represents the bulk 
of the animal before the moulting, then the animal before moult- 
ing is to its bulk after moulting, as 1 to 1.211. The increase is, 
therefore about one-fifth in bulk of the great claws and body. 
The dimensions of breadth (b) are not so well taken or so sig- 
nificant but the ratio is nearly the same, 1 to 1.192. 
The increase in the dimension of length are really better pre- 
sented by the differences than by any ratio. The ratio of increase 
in length is as 1 to 1.01. This, however, though not perhaps a 
truthful result, shows that the increase in length is much less than 
that in the breadth and thickness of the body and its parts. 
Lobster. 
Shell. 
Difference . 
23i 8 e 
1 9-6- 
iy i6 
4_3_ 
*16 
Bulk. 
8t 6 6 
7 A 
l- 4 - 
x 1 6 
Breadth. 
45, 8 e 
38-f-f 
1123 
°TZ 
Length. 
The shell showed no signs of cracking along the median line of 
the carapax, until after the lapse of several weeks. Then it began 
to curl inwards and finally cracked all along the suture, except at 
the posterior end which still remains closed. Absolution had 
taken place, but in this specimen had not gone far enough to 
allow the shell to split during the moulting. It would seem from 
this, that if the pressure had been more excessive, rupture might 
have taken place, but in place of this the thorax gave way below as 
is usual in the Cray-fish. It will be noticed too, that the cephalo- 
thorax was drawn out first, as in the Cray-fish, instead of the 
abdomen first, as in the two animals seen by Salters’ two observers. 
