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PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 47 
those of the outer series, and these larger still than those of the lower 
series, which are quite small; there are eight to twelve of the larger 
spines in each series, and the surface between the spines, and also on 
the carpus and the body of the chela, is roughened with small squami- 
form and sparsely setigerous elevations. The carpus is short and armed 
with three distal spines on the inner side, and with a few small spines 
and tubercles on the outer side. The chela is just about as long as the 
merus and no stouter; the body is subeylindrical, considerably longer 
than the digits, and armed along the inner side with two series of spines 
corresponding with the two inner series on the merus, but the spines 
are much smaller and more crowded; the digits are slender, nearly 
straight laterally, but curved slightly downward at the tips, and the 
prehensile edges are irregularly dentate. 
The first pair of ambulatory legs reach about to the middle of the 
carpi of the chelipeds; the dorsal edge of the merus is compressed and 
armed with a series of about ten large spines; the antero-inferior angle 
is armed with a similar series of much smaller spines, and there is, in 
addition, a large spine on the posterior side below the articulation with 
the carpus; the carpus is short and crested above with a series of spines 
like the merus, and the posterior side in both carpus and merus is rough- 
ened like the surface of the chelipeds; the propodus is about as long as 
the merus, slender, compressed laterally, with a few long sete on the 
upper edge and a series of short spiniform setz below, but without true 
spines or teeth; the dactylus is nearly half as long as the propodus, 
broad, strongly compressed, terminates in a strong chitinous tip, and is 
armed below with a closely set series of setiform chitinous spines de- 
creasing in size proximally. The second pair are like the first, except 
that the merus is unarmed below. The third pair are considerably 
shorter than the second, reaching scarcely to the tips of the propodi of 
the second pair, and there is a series of small spines along the middle 
posterior side of the merus, but in other respects they are like the third 
pair. 
The posterior pair of thoracic legs are much shorter than in the typical 
species of Munida, being only about as long as the meri of the third pair 
of ambulatory legs; the merus and carpus are about equal in length, 
and each is considerably longer than the ischium; the chela is little 
more than half as long as the carpus, but swollen distally, so as to be 
much broader, and the prehensile edge of the propodus and the articu- 
lation with short, stout, and strongly curved dactylus is terminal and 
nearly transverse, the propodal digit being reduced to a slight angular 
projection. The chela and distal end of the carpus are densely clothed 
with long sete. 
The consolidated sternal plates between the bases of the chelipeds 
and true ambulatory legs are marked by a deep longitudinal median 
sulcus on each somite, are separated from each other by conspicuous 
sulci, and the plate between the bases of the chelipeds is armed each 
