REPORT ON THE BRACHYURA. 
63 
Scyra compressipes, Stimpson (PI. VII. fig. 4). 
Seym compressipes, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 218, 1857. 
Japan, in lat. 34° 38' 0" N., long. 135° 1' 0" E. (in 50 fathoms), Station 233a (an 
adult male). 
As this species is only known by Stimpson’s short diagnosis, it may be useful to 
supplement the figure now given with the following description : — 
The carapace is depressed, with the dorsal surface uneven and tuberculated ; the 
gastric region large, rounded on the dorsal surface, and bearing one or two small 
tubercles ; the depressions separating the gastric from the cardiac and branchial regions 
are wide and shallow ; the branchial regions bear some small tubercles, and a small, 
slightly recurved, lateral spine. There is a spiniform tubercle on the sides of the hepatic 
regions ; the prseocular spine is well developed and acute. The rostrum is divided half 
way to its base by a triangular notch and the lobes thus formed are subtriangulate in 
shape, flattened and expanded at the base, and distally acute. The pterygostomian regions 
are tuberculated, the tubercles being disposed in an oblique series ; the sternum is trans- 
versely sulcated between the segments of which it is composed. The segments of the post- 
abdomen are transverse except the last, which is subtriangulate and distally subacute. 
The eyes are very small. The basal joint of the antennae has a small tubercle at the 
base of the exterior margin and a very small tooth at the antero-external angle. The 
ischium of the exterior maxillipedes is longitudinally concave on its exterior surface ; the 
inerus is nearly quadrate, with the antero-internal angle obliquely truncated, scarcely 
notched ; exognath subacute. The chelipedes (in the adult male) are moderately 
developed, with the merus obscurely quadricarinated ; the superior carina irregularly 
dentated and armed with a strong subterminal spine ; carpus roughened externally, and 
cannated on its inner surface ; palm smooth, compressed and carinated above ; fingers 
minutely and regularly denticulated on the inner margins, and distally acute. The 
ambulatory legs are very slender and of moderate length, with the penultimate and anti- 
penultimate joints longitudinally sulcated; dactyl! little, if at all shorter than the 
penultimate joints. The margins of the carapace and ambulatory legs are hairy, the setae 
clavate ; the gastric region of the carapace and rostrum also are pubescent. Colour (in 
spirit) light brown. 
Adult $ . 
Lines. 
Millims. 
Length of carapace and rostrum, nearly 
11 
23 
Breadth of carapace, .... 
7 
14-5 
Length of a chelipede, .... 
13 
27-5 
Length of first ambulatory leg, 
141 
31 
