REPORT ON THE BRACHYURA. 
97 
the somewhat greater prominence of the spines of the outer margin of the hand ; three 
of the tubercles of the gastric region, and one on the cardiac and on each branchial 
region, are more elevated than the others, and from some of the elevated tubercles of the 
carapace spring long tufts of hairs, which are not shown in the figure of Lambrus 
guerinii (notably from the prseocular tubercles and the elevated tubercles of the gastric 
and branchial regions). These tufts are absent, however, from some Brazilian and West 
Indian examples in the collection of the British Museum. 
The dimensions of the female are : — 
Adult ?. 
Lines. 
Millims. 
Length of carapace and rostrum, about 
. 
13 
28 
Breadth of carapace, . 
• 
31 
Length of a chelipede, about . . . . 
28J 
60 
Length of first ambulatory leg, 
. 
151 
33 
Lambrus serratus, Milne Edwards. 
Lambrus serratus, Milne Edwards, Hist. Nat. Crust., vol. i. p. 357, 1834. 
Platylambrus serratus, A. Milne Edwards, Crust, in Miss. Sci. au Mexique, pt. 5, i. p. 156, pi. 
xxx. fig. 1, 1878, et synonyma. 
Lambrus hqooides, White, List Crust. Brit. Mus., p. 12, 1847. 
Bahia, shallow water (an adult male and female). 
Adult $ . 
Lines. 
Millims. 
Length of carapace and rostrum, 
9 
19 
Breadth of carapace, about 
10 
21 
Length of a chelipede, about 
28i 
61 
Length of first ambulatory leg, 
121 
26 
If the subgenus Platylambrus, A. Milne Edwards, be retained, it will probably be 
best restricted to this species, and, perhaps, Lambrus granulatus, Kingsley. 
Subgenus Aulacolambrus, A. Milne Edwards. 
Aulacolambrus, A. Milne Edwards, Crust, in Miss. Sci. au Mexique, pt. 5, p. 147, 1878. 
Carapace depressed, with the rostrum and epistoma very short, the lateral epibranchial 
spine very considerably elongated. The buccal cavity is bordered laterally by a deep, 
smooth and wide cavity extending from the branchial aperture at the base of the 
chelipedes nearly to the orbits. The chelipedes are greatly elongated, and the palm and 
merus are armed with long spines. 
(ZOOL. CHALL. EXP. PART XLIX. 1886.) 
Ccc 13 
