REPORT ON THE BRACHYURA. 
121 
Actaea hystrix, n. sp. (PL XI. fig. 3). 
The body is naked, except as regards the dactyli of the ambulatory legs, which 
possess a few hairs. The carapace is but slightly transverse, and its dorsal surface 
is everywhere covered with close-set, conical, acute granules, which are longer and more 
spiniform near the antero-lateral margins ; the inter-regional sutures and those defining 
the areolets of the dorsal surface are moderately distinct ; the front has its anterior 
margin deflexed and divided into two lobes by a median notch ; the frontal lobes are 
rounded and granulated, with their external angles little prominent. The three posterior 
lobes of the antero-lateral margins are distinct, and each is armed with three or four, 
conical, spinuliform granules. The pterygostomian regions are very closely and finely 
granulated ; the sternal surface of the body and the post-abdomen is coarsely punctulated. 
All the segments of the post-abdomen (in the female) are distinct ; the terminal segment 
is the longest ; the short eyes are closely set in the orbits, whose margins are granulated, 
as are also the eye-peduncles themselves, near to the cornese. The basal antennal joint 
is somewhat longer than broad, and reaches to the subfrontal process, but not to the 
apex of the inner suborbital angle ; the exognath of the outer maxillipedes reaches to the 
antero-external angle of the transverse, distally truncated, merus-joint. The chelipedes 
(in the male) are moderately robust and subequal ; the merus, wrist, and palm are covered 
with numerous close-set, conical, acute granules, which are longer and spinuliform on the 
upper margins ; the inner surface of these joints is granulated ; the palm is but little 
longer than the wrist ; the fingers are colourless and regularly denticulated on their inner 
margins ; externally granulated ; the dactylus has two or three spinules on its upper 
surface ; the ambulatory legs are of moderate length, closely granulated, the granules 
lengthening into short spines on and near the upper margins of the merus, carpus, and 
penultimate joints ; the dactyli are armed with a small terminal claw. Colour (in 
spirit) whitish. 
Adult cf • 
Length of carapace, nearly 
Breadth of carapace, nearly 
Length of a chelipede, rather over 
Length of second ambulatory leg, 
Lines. Millims. 
3 6 
4 8 
3 7 
3 7 
Of this pretty little species but a single female specimen was obtained, off Cape York, 
in 8 fathoms, lat. 10° 30 ' S., long. 142° 18 ; E. (Station 186). 
In many of its characters it is nearly allied to the West Indian Actaea acantha (Milne 
Edwards), 1 in which species, however, the spinules and granules of the carapace are less 
numerous and are interspersed with hairs, and the fingers are dark coloured. 
1 Of. A. Milne Edwards, Crust, in Miss. Sci. au Mexique, pt. 5, p. 245, pi. xliii. fig. 1, 1879. 
(ZOOL. CHALL. EXP. — PART XLIX. — 1886.) Ccc 16 
