EEPOET ON THE BEACHYUEA. 
187 
its posterior margin, of which one is near, and the other at, the distal extremity ; 
the carpus has a long spine on its inner margin, and its outer surface is externally 
granulated and bears a small spine and two or three spinules ; the palm is about as 
long as the merus and is externally granulated and bears three spines, one of which is 
placed near the base, one at, and the third near, the distal extremity ; the fingers 
about equal the palm and are denticulated nearly as in Lupocyclus rotundatus. The 
ambulatory legs are slender and smooth, with the penultimate joints compressed, the 
dactyli compressed and not greatly exceeding the penultimate joints in length. The 
swimming legs have the penultimate and terminal joints dilated and compressed, the 
terminal joint, as already stated, regularly ovate, and distally rounded. Colour (in 
spirit) yellowish-brown. 
The dimensions of an adult male are as follows : — 
Adult $. 
Length of carapace, . 
Breadth to base of lateral spines, 
Length of chelipede, 
Length of first ambulatory leg, 
Length of swimming leg, 
Lines. 
Milliir 
7 
15 
8* 
18 
111 
24-5 
14 
29-5 
Q1 
20 
Several males and females were collected near the Ki Islands, in 140 fathoms 
(Station 192), in lat. 5° 49' 15" S., long. 132° 14' 15" E., and an adult male, north of 
the Admiralty Islands, in 150 fathoms (Station 219), in lat. 1° 54' 0" S., long. 
146° 39' 40" E. 
In the male from the Admiralty Islands the two median frontal lobes are somewhat 
more prominent than in the specimens dredged at Station 192. The tubercles of the 
dorsal surface of the carapace are most distinct in the smallest specimens. 
This species is at once distinguishable from the Lupocyclus philip>pinensis, Semper 
( ined .), Nauck, by the five-toothed antero-lateral margins of the carapace and the shorter 
chelipedes. 
Cronius, Stimpson. 
Cronius, Stimpson, Ann. Lyc. Nat. Hist. New York, vol. vii. p. 225, 1860. 
,, A. Milne Edwards, Crust, in Miss. Sci. au Mexique, pt. 5, p. 231, 1879. 
This genus includes certain species formerly referred to Amphitrite, Achelous, and 
Goniosoma, in which the antero-lateral margins of the carapace are armed with eight 
alternately larger and smaller teeth, besides the lateral epibranchial tooth, which scarcely 
exceeds in length the larger teeth of the antero-lateral margins. As in many species of 
Goniosoma, the frontal margin is six to eight-lobed. The endostome or palate is obscurely 
longitudinally ridged, and the post-abdomen in the male is five-jointed (in the specimens 
I have examined). The flagellum of the antennae is excluded, as in Goniosoma , from the 
