REPORT OjST THE BRACHYURA. 
31 
dilated ; the spinides are almost entirely absent from the penultimate (as well as from 
the terminal) joints of the ambulatory legs of the two last pairs. Colour (in spirit) 
light yellowish or pinkish. 
Adult ?. 
Length of carapace to base of rostrum, nearly . 
Greatest breadth of carapace, nearly 
Length of spine of rostrum, about 
Length of a chelipede, about 
Length of first ambulatory leg, about . 
Lines. Millims. 
3| 8 
3 7 
1 2 
4 -|- 10 
10J 22 
The single specimen, although of small size, is an adult female, bearing ova. It was 
dredged in 150 fathoms, north of the Admiralty Islands, in lat. 1° 54' 0" S., 
long. 146° 39' 40" E. (Station 219). 
From the type of the genus, Ergasticus clouei, A. Milne Edwards , 1 this species, as I 
learn from an unpublished figure kindly sent me by the author, is at once distinguished 
by the different spinulation of the carapace, and the existence of small spines on the 
inferior wall of the orbit ; in this latter character it resembles an American type be- 
longing to a genus apparently very closely allied to, if distinct from, Ergasticus, 
the West Indian Trachymaia cornuta, A. Milne Edwards , 2 which, to judge from the 
description and figure, is distinguishable from Ergasticus only by the absence of 
accessory spinules from the rostral spines, and by the non-spinuliferous palms of the 
chelipedes and first ambulatory legs. 
Echinoplax, n. gen. 
Carapace subpyriform, longer than broad, and covered with very numerous closely 
set spines and spinules ; orbital margin spinose ; spines of rostrum straight, acute, 
divergent from their bases, and bearing several (six) accessory spinules. Post-abdomen 
(in the female) seven-jointed. Basal antennal joint slender, spinuliferous, and in contact 
with the front at the distal extremity ; flagellum visible from above at the sides of the 
rostrum. Maxillipedes of normal shape ; merus truncated and not notched at the distal 
extremity, the antero-lateral angle not produced. Legs spinuliferous. Chelipedes (in 
the female) slender and feeble, with the palms not dilated. Ambulatory legs consider- 
ably elongated, with the penultimate joints not dilated ; the dactyli nearly straight. 
Echinoplax is distinguished from all the genera of the subfamily Inachinae, except 
Ergasticus, with which I am acquainted, by the very numerous spinules of the carapace, 
the accessory spinules of the rostrum, and the spinuliferous orbital margins. It is very 
nearly allied to Anamathia, and were it not that the genera of this family are generally 
1 Gomptes rendus, vol. xciii. p. 879, 1881. 
2 Crust, in Miss. Sci. au Mexique, pt. 5, p. 352, pi. xxxiA. fig. 2, 1880. 
