REPORT OH THE BRACHYURA. 
287 
traces exist of the tubercles on the outer surface of the palms of the chelipedes, which are 
discernible in specimens o*f Calappa lophos of larger size but not fully grown. 
Calappa clepressa, n. sp. (PL XXIII. fig. 2). 
Carapace much more depressed than is usual in the genus and comparatively narrow 
in proportion to its length; its surface is tuberculated and finely granulated. Of the 
tubercles (which are not large), there is a longitudinal median series on the gastric and 
cardiac regions, and several on either side of this series on the hepatic and front of the 
branchial regions ; the postfrontal region is nearly smooth ; the lateral clypeiform pro- 
longations of the carapace are little developed, and are covered above with transverse, 
granulated, piliferous lines. The front projects but little, and is divided by a deep 
median notch. The antero- lateral margins of the carapace are very obscurely toothed ; 
its clypeiform prolongations are armed on the sides with distant serratures and are 
posteriorly entire, as is also the posterior margin of the carapace. The ridge upon the 
pterygostomian region is marked by a notch or fissure, where it unites with the inferior 
wall of the orbit. All the post- abdominal segments (in the male) are distinct ; the 
penultimate and terminal segments are the longest, the terminal longer than the 
penultimate segment, triangulate, and distally acute ; the anterior margin of the third 
segment is a little broader than the base of the following (fourth) segment. The eye- 
peduncles are slender and elongated. The orbits, antennae, and outer maxillipedes are 
very similar to the same parts in Calappa,. lophos (Herbst). The chelipedes also nearly 
resemble those of Calappa lophos; the merus having, as in that species, a strong 
transverse subdistal carina on its outer surface, which is not notched or spinose, but the 
carpus and the palms of the chelipedes are more granulated on their outer surface ; the 
dactyl, also, is granulated externally near the base, and has (as in Calappa lophos ), a 
rounded lobe on its upper margin close to the articulation with the palm. The 
ambulatory legs, as in other species of the genus, are small, smooth, slender, and 
compressed. 
The colour (in spirit) is light yellowish-brown ; the lateral expansions of the carapace, 
outer surface of the chelipedes, and the ambulatory legs of a pinker hue ; the inner 
surface of the palms are brownish-pink upon a yellowish ground ; the coloration being 
disposed, in places, in wavy lines. 
Adult (?) ? . 
Lines. 
Millims. 
Length of carapace, nearly .... 
9 
18-5 
Breadth of carapace at lateral expansions, 
101 
22 
Length of a chelipede, .... 
10 
21 
Length of second ambulatory leg, 
9 
19 
