340 MR. E. J. MIERS ON [ Mar. 21, 
2 are placed on the cardiac region, of which the posterior is very 
large, 3 (very large) on the intestinal region, 2 on each hepatic 
region, and about 7 on each branchial region, besides the marginal 
spines, of which there are 5 ; 3 are placed on each pterygostomian 
region, the anterior of which is situated at the antero-lateral angle of 
the buccal cavity ; there is also a distinct but not very large pree- 
ocular spine. The orbits are rather small, with a lateral aspect, and 
with two fissures above and a large hiatus below. The spines of the 
rostrum are subcylindrical and very long (in the male as long as the 
carapace), straight, and very slightly divergent distally ; they bear 
an accessory spine on their upper surface at some distance from the 
distal end, which is acute. The basal antennal joint is longer than 
broad, and bears a strong spine, directed obliquely downward, at its 
antero-external angle; the next joint is slender and very much elon- 
gated, the third also slender; these joints and the flagellum are 
scarcely visible in a dorsal view. The epistoma is large, but broader 
than jong; the ischium joint of the outer maxillipedes is longer than 
broad; the merus joint truncated at its distal end, and with only a 
very small notch at its antero-internal angle above the place of articu- 
lation with the next joint. The chelipedes in both sexes are slender ; 
in the male, however, somewhat more robust thanin the female; the 
merus joint is cylindrical, elongated, with a strong spine above at its 
distal end. Carpus short, armed on its upper and outer surface with 
two or three small spines or tubercles; palm smooth, subcylindrical 
(in the male about 33 times as long as broad) ; fingers slender, more 
than half as long as the palm, somewhat incurved, having between 
them when closed (in the male) a small hiatus at base; both fingers 
in their distal halves are denticulated and meet along their inner 
edges ; the mobile finger has in the male a tubercle on its inner margin 
near the base. The ambulatory legs are slender and much elon- 
gated, the first pair very much longer than the following; there isa 
spine at the distal end of the upper surface of the merus joints in all 
the ambulatory legs. The dactyli, although shorter than the pre- 
ceding joints, are yet elongated and slightly curved, and terminate 
in a small corneous claw. The segments of the postabdomen are all 
of them distinct in both sexes; in the male all, except the last, have 
a small median spine, on each side of which, on the second and 
third segments, is a lateral spine; in the female the first four are 
armed with a small median spine or tubercle. The animal is covered 
with a short dense yellowish-brown pubescence, which, however, is 
absent from the palms and fingers of the chelipedes, and partially so 
from the penultimate and terminal joints of the ambulatory legs, the 
ground-colour of the integument being, in these places, in the two 
dried specimens 1 have examined, purplish-red. Length of the 
carapace to the base of rostral spines in an adult male about 2% 
inches (68 mm.), which is also the length of the spines themselves ; 
of a chelipede about 43 inches (113 mm.), of the first ambulatory 
legs nearly 93 inches (242 mm.). 
Two specimens, a male and a female, were collected. In the 
female the carapace is somewhat more pyriform and convex, the 
