APSEUDES. 145 
The first pair of legs are robust, terminated by a 
strong didactyle hand. The second pair, though smaller 
than the first, are more robust than the following, being 
flattened and terminated by a broad hand-like joint, more 
or less palmated, the penultimate joint (propodos), having 
a small movable finger (dactylos) ; the five following pairs 
of legs are slender and simple. The five segments of the 
tail are short, but the last (sixth segment) is elongated, 
and terminated by a rounded plate (the telson), on each 
side of which is placed a flattened appendage, termi- 
nated by one long and one short very slender filiform 
branches, being the representatives of the last pair of 
tail-feet. The five anterior segments of the tail are 
respectively furnished with a pair of appendages, each 
consisting of a basal stem supporting two delicate folia- 
ceous plates strongly ciliated along their margins. The 
eggs are borne in a semi-transparent pouch beneath the 
breast, which extends from the second to the sixth 
segment of the body. 
This is one of the most interesting genera of crus- 
taceous animals. In some respects, such as the form 
of the eyes, the articulated filament attached to the 
upper-, the squamiform process of the lower- antenna, 
and the cheliferous anterior feet, we perceive a relation- 
ship to the macrourous stalk-eyed order of Crustacea; in 
other conditions it assimilates the Amphipoda, in which 
order Professor Milne Edwards was at the first disposed 
to place it, although he subsequently referred it to the 
Isopodes Idoteides (Encyclop. portatif. p. 182; Ann. Sci. 
Nat. 1830, August), induced to this step by the struc- 
ture of the breathing apparatus, which he attributed 
to the under side of the segments of the tail; whilst 
the soldering of the head and first segment of the body, 
and the podophthalmous structure of the eyes, induced 
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