
40 CAPRELLIDZ. 
in appearance, and have the posterior margin of the 
penultimate joint armed with four radiating spines. The 
fourth pair are like the third, but smaller, while the fifth 
are so much smaller and imperfect in their condition 
as to partake of a rudimentary character. They are, 
moreover, directed backward; that is, contrary to the two 
posterior pairs, and therefore contrary to its normal con- 
dition. The two posterior pairs of legs are attached 
near together, in consequence of both being situated at 
the posterior extremity of their respective segments, 
the last of which is much shorter than any of the others. 
This single feature is sufficient to enable the observer 
to detect an animal of this genus, however otherwise 
damaged, since in Caprella, &c., the last two joints are 
always short, and hence the last three pairs of legs are 
always in close juxtaposition. The last two pairs of legs 
are longer than the others, and have the penultimate 
joint, for nearly two-thirds of its length, armed with two 
spines, opposed to the extremity of the finger which 
closes upon the preceding joint. The tail is rudimentary, 
consisting, when recent, of a cylindrical tube, without 
any limbs except two pairs of rudimentary, styliform 
appendages, situated near the extremity of the preceding 
segment, which probably fulfil the same office as their 
homologues in the male brachyurous crustacea. 
We anticipate that the geographical distribution of 
this species will be ultimately found to be more general 
than our experience has yet ascertained. I[t was first 
taken as British by Montagu on the southern coast of 
and Montagu belong) ; and the second with the first pair of hands triangu- 
lar, somewhat lobed at the base, the wrist deeply serrated, the second pair 
of hands oval with two teeth at the base, and serrulate along the palm, head 
very obtuse in front, and the branchial lamelle smaller and cylindrical (to 
which all the Berwick specimens are referable). 
