REPOET ON THE BRACHYURA. 
151 
The Challenger specimens are at once distinguished from Pilumnus tridentatus, 
Maitland, as figured by Hoek, 1 by the presence of the small spine at the exterior angle 
of the orbit, by the distinctly spiniform antero-lateral marginal teeth, by the absence of 
transverse lines upon the dorsal surface of the carapace, and by other characters. 
Pilumnus brasiliensis, n. sp. (PL XIII. fig. 2). 
The body and limbs are' rather thinly clothed with longish hairs ; the carapace is 
convex, broader than long, shaped nearly as in Pilumnus aculeatus, and the front is 
moderately prominent, with the median lobes truncated and armed with short spinules 
on the anterior margins ; the lateral lobes obsolete. The antero-lateral margins of the 
carapace are armed with three strong spines besides the spine at the outer angle of the 
orbit ; between the outer orbital spine and the first antero-lateral spine is a smaller 
spinule, and the first antero-lateral spine bears a small accessory spinule on its posterior 
margin near the base. The dorsal surface of the carapace is without granulations or 
spinules ; the subhepatic region is finely granulated ; there is no spinule on the 
pterygostomian region. The superior and inferior margins of the orbit are armed with 
strong spinules, which are of unecjual size ; two on the upper margin and three on the 
inferior margin (near the inner hiatus of the orbit) being longer than the others. The 
antennae and maxillipecles present nothing remarkable. The chelipedes (in the female) 
are nearly equal, but the right is a little larger than the left ; the trigonous merus-joint is 
granulated on its upper and lower margins and bears a strong acute tooth near the 
distal angle of the upper margin, which terminates in a spine ; the wrist and palm are 
armed with spinules over the whole of the upper and outer surface, the spinules longer 
on the upper surface and especially on its inner margin ; those of the palm are arranged 
in eight longitudinal series ; the fingers are dentated on their inner margins ; the upper 
is sulcated and granuli-spinulous above at the base. The ambulatory legs are of moderate 
length and rather slender; the carpus or antepenultimate joint is armed with spinules; 
the straight and slender dactyli terminate in a small and not strongly curved claw. 
Colour (in , spirit) light yellowish-brown ; the hairs yellowish ; the fingers of the 
chelipedes are of a slaty hue, the colour not extending over the inner and outer surface 
the palm. 
The dimensions are as follows : — 
?• 
Lines. 
Millims. 
Length of carapace, nearly 
4 
8-5 
Breadth of carapace, nearly 
5 
10-5 
Length of a chelipede, nearly . 
5 
10-5 
Length of second ambulatory leg, 
6 
15 
1 Tijd. Ned. Dierk. Vereenig., vol. ii. p. 243, pi. xiv. figs. 12, 16, 1876. 
