CALLISOMA CRENATA. 
121 
white ground. The superior antennae are very stout at 
the base ; the first joint of the peduncle is nearly as long 
as the head, and almost as thick as long ; the second 
joint is very short, and a little narrower than the first; 
the third is very short, and almost covered by the pre- 
ceding; the flagellum has the first articulus very long, 
and broader at the base than at the distal extremity, the 
remaining articuli (six or seven in number) are small. 
The inferior antennse are slender, and about one-third 
the length of the animal ; the peduncle is rather longer 
than the peduncle of the superior ; the flagellum is very 
slender, and lies folded beneath the body of the animal. 
The first pair of arms are long and slender, and have 
the hand long and narrow, the margins parallel, the 
distal extremity being anteriorly armed with several 
fasciculi of strongly curved hairs ; the finger consists 
of a thick brush of short stiff hairs. The second pair 
are more robust than the first ; the hand is ovate, 
with the inferior angle produced and depressed; it ter- 
minates in a small tooth ; the finger is rather longer 
than the process of the hand, and has the inner margin 
waved; together they form a very perfect claw, which 
bears a strong resemblance to those existing in some 
species of Soldier Crabs ( Pagurus Dillwynii.) The third 
and fourth pairs of legs are not very robust ; the three 
last gradually increase in length. The first squamose 
plate of the fifth pair of legs is almost round, and cor- 
responds anteriorly with a deep excavation in the pre- 
ceding ; the second squamose joint is produced pos- 
teriorly, and is broader than long; the next joint is 
very short ; but the fourth is produced posteriorly into a 
small squamose plate, fringed with hairs ; the wrist is 
short, and stouter than the hand, which is long, slender, 
and has the margins parallel. The two posterior pairs 
