180 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Before molting the animal was of a dark umber color and very sluggish. Imme- 
diately after this ecdysis (the seventh in number) the whole body was translucent, the 
general color being reddish-brown, with a slight greenish tinge on the carapace. The 
large claws were a bright terra-cotta color. There was a prominent whitish crescentic 
spot immediately behind the cervical groove and the three characteristic tendon marks 
on each side of the carapace were as prominent as in the sixth stage. (Compare plate 
24.) The pleura of the first abdominal somite were snow-white, and the uropods of the 
tail-fan were tipped with cream color. 
The lobster after the seventh molt keeps steadily upon the bottom, in walking 
over which it uses chiefly the last three pairs of thoracic legs. The large claws and 
smaller chelate legs next to them are extended forward in front of the head, although 
the latter appendages are occasionally used for locomotion. A very slight differentia- 
tion in the large chelae is noticed, but in the eighth stage the difference is marked. 
At about the time of the seventh ecdysis the right antennary flagellum was lost; 
eight days later it appeared, in the process of regeneration, as a short spiral coil; 
this continued to grow, and after the eighth molt, which occurred on the 8th of 
August — an interval of two weeks from the last — it was about its normal size. 
At the seventh stage pigment has been deposited below the enamel layer of the 
cuticle in an amount which, though at first very slight, increases with every molt, and 
the color pattern becomes more and more complex. In the eighth stage the general 
color is deep reddish-brown, with olive tints. The characteristic tendon marks and 
cream-colored spots are present. There is a dorsal light-green median stripe on the 
carapace, very much narrower than when first seen in the fourth stage. 
This lobster had undergone no appreciable change by the 23d of August, but 
when next examined, September 22, it measured 29.5 mm. In the interval of thirty 
days it had undoubtedly molted twice and was in the tenth stage. The first abdominal 
somite has very delicate, white appendages, which are distinctly two-jointed and raised 
from the surface to a nearly vertical position. 
Lobster No. 5 (table 35). — This lobster was hatched about May 25, and when 
isolated, on August 1, it measured 24 mm. It was probably in the ninth stage and was 
about 67 days old. The general color was dark green, touched with brown; large 
chelm olive-brown, reddening toward the extremities, with glistening white tips; the 
under side was a tint, lighter. The uropods and telson are whitish, bordered with 
reddish-brown. The contents of the intestine can be seen through the slightly trans- 
lucent shell. Tendon marks on the carapace are prominent, as in the other cases 
described. 
Some measurements of this lobster are as follows: 
Measurements of lobster No. 5, in ninth stage. 
Millime- 
ters. 
24 
11 
5 
Length of antennary flagellum 
23 
Length of large chela on either side 
Greatest breadth of chela of one side 
9 
3 
Greatest breadth of chela of other side 
2. 5 
In the smaller of the two claws the extremities are nearly straight; in the larger 
the “lingers” are more bent, and each bears a large tubercle at about the middle of 
the occludent margins. 
