THE AMERICAN LOBSTER. 
181 
The animal hides among the stones at the bottom of the aquarium, and behaves 
in most respects like an adult animal. The eyes are dull brownish black, without 
iridescence. 
When examined again on August 13 this lobster had molted, now for the tenth 
time, and was 2S mm. long. The general color was dark brownish green, with 
reddish-brown on the large chelipeds, as before. The white or light color of the 
pleura of the first abdominal segment and tail-fan is obscured or has disappeared. 
The shell pigments are now more abundant, and the cuticle has lost its trauslucency 
in consequence. 
The following measurements illustrate the growth of some of the parts: 
Measurements of lobster No. 5, in tenth 
stage. 
Millime- 
ters. 
| Measurements of lobster No. 5, in tenth 
stage. 
Millime- 
ters. 
28 
13 
11 
Length of carapace 
Greatest breadth of cutting chela 
3 
Greatest width of carapace 
6.4 
Length ot dactyl of cutting chela 
5.7 
Length from tips of extended (shell- 
34 
Length of telson 
4 
3. 3 
Length of antennary flagellum 
25 
Length of terminal fringe of hairs 
2 
Length of antennal exopodite 
5.5 
10. 5 
Greatest width of abdomen at second 
5 
Greatest breadth of crushing chela. . . 
3. 5 
Length of rostrum 
4 
Length of dactyl of crushing chela. . . 
5 
Breadth of rostrum at base 
2 
Lobster No. 0 (table 35). — This was the only survivor out of a considerable number 
of lobsters hatched early in the season of 1802, and when first examined — about the 
first week in August — measured 18.5 mm., and was probably in the seventh stage. At 
this time a slight difference in the large claws could be detected, which increased 
with subsequent molts. There is nothing noteworthy in which this young lobster 
differed from those already described. (See No. 38, table 34.) 
Lobster No. 1 (table 33). — I have referred to this young female lobster, which was 
hatched about June 20, 1893, and was alive when I left Woods Hole, August 0, 1894. 
It was therefore 412 days old, and allowing it to have attained the length of 28 mm. 
at the tenth molt — the average length of three individuals known to have reached 
this stage — it must have molted thirteen times, which I am confident is not far from the 
truth. It is probable that no molts occurred during the winter, the last two recorded 
having taken place May 21 and June 18, 1894. 
The brilliant color is now wholly due to the pigments of the shell, which is no 
longer transparent, and the color pattern is so complicated that it almost battles descrip- 
tion. The body is light umber, freely speckled and mottled with darker shades. The 
appendages are reddish-brown and slightly translucent. Small light areas or suffu- 
sions are scattered over the body. The tendon marks on the carapace corresponding 
to those seen in the fifth and sixth stages are prominent, that below the cervical groove 
being over a millimeter in diameter. The pleura of the first abdominal ring are snowy 
white. The free edges of the segments of the body and appendages are bright blue. 
The large cliche are tipped with white. The openings of the oviducts are clearly 
seen and the copulatory pouch is not yet closed. The color of the appendages on 
the under side is light reddish-brown. The tail-fan is of the same hue edged with 
deep red. The claws, which are tufted with setie at their tips, show remarkably 
little differentiation. The eyes have a dark-purplish pigment and have acquired the 
characteristic large size and prominence of the adolescent stages. 
