376 Proceedings of the Royal Physical Society. 



now stained with blue. Left antenna lias developed more coils, and 

 has assumed a pink tinge. Length of coiled portion, ^ in. 



5, vi. 83. — Left chela, barely IJ in. long ; right, ^| in. 



12, vi. 83. — Left chela, 1^ in. long ; right, l^V in. 



19, vi. 83. — Left chela, just over I5 in. long ; right, IfV i^i' 



26, vi. 83. — Left chela, Ix-g- long ; right, 1| in. Coiled portion of left 

 antenna is now slightly over | in. long, and the colour is bright 

 brownish red, paler at the apex. The base is flesh coloured, with blue 

 stains. The amount of blue pigment in the new chelate limbs has 

 rapidly increased, so that now they are as dark as their uninjured 

 fellows. 



1, vii. 83. — Ecdysis has taken place during the past night. (For measure- 

 ments of new appendages, see table. ) 



14, viii. 83, — This specimen has again lost both chelae in a fight with 

 Lobster B. 



5, X. 83. — Rudiments of both chelate limbs have again made their appear- 

 ance. The rudimentary antenna has its apex arranged in a spiral of 

 four diminishing coils. 

 [Again the rudiment of the right chela was a little smaller than that of 

 the left. During November and the early part of December this 

 difference became less and less marked until 16, xii, 83, when both 

 measured about 1^ in. in length. I have a series of eight intermediate 

 measurements, but as these are very similar to those taken prior to 

 the last ecdysis, it will not be necessary to give them here. At no 

 time was the difference in size so marked as on the previous occasion, 

 a fact which is probably due to the two chelae having been lost at the 

 same time, whereas on the former occasion the right chela was lost 

 two months after the left.] 



25, xii, 83, — Ecdysis has taken place during the past night. The right 

 antenna is still wanting. 



25, vi. 84. — Another ecdysis has taken place during the past night. This 

 time the right antenna has been reproduced, and the appendages are 

 all perfect. 



19, xi. 84. — Ecdysis has again taken place. Special attention was directed 

 to the rupture along the median dorsal line of the carapace, which is 

 supposed to take j^lace during ecdysis. In this exuvium there is 

 certainly a dissolution of the hard cement of the suture, at least in the 

 posterior part of the carapace, and the contiguous hard parts become 

 on this account somewhat movable, but the membrane connecting 

 them remained unruptured even at the extreme posterior part of the 

 carapace. This membrane is similar to that inside the meropodite 

 and the fused basi-ischiopodites, which membrane becomes flexible and 

 (generally ?) ruptured during ecdysis. In the present case this mem- 

 brane does not appear to have suffered any rupture. 



