1S2 
GAMMARTDiE. 
articulates towards the posterior margin of the foot, and 
is directed backwards, contrary to the usual plan in the 
Ampliipoda ; it is short, strong, and sharp, and furnished 
on the outer surface with a few minute hairs. The sixth 
pair of legs resemble the preceding, except that the se- 
cond joint is larger. The seventh pair differ from all the 
preceding: the second joint is very long; the plate is 
long-ovate, broader below than above, and postero-infe- 
riorly produced to the extremity of the next succeeding 
joint ; the foot is long-ovate, and furnished at the distal 
extremity with a few hairs and spines ; the finger is 
broad, flat, straight, and lanceolate : near the posterior 
margin is a longitudinal row of circular spots. The caudal 
appendages are unequal in length ; the antepenultimate 
have the branches longer than the peduncle ; the lower 
branch is simply styliform, the upper is slightly longer, 
of the same form, but having the upper margin fringed 
with a row of equidistant spines. The penultimate pair 
have the peduncle with the upper margin spinous ; the 
branches are subfoliaceous, and curved so as to fit one 
against the other, and both have their margins thickly 
fringed with equidistant sharp spines. The ultimate pair 
are likewise subfoliaceous : the lower branch has the lower 
margin fringed with spines, and the distal extremity 
of the upper is furnished with simple hairs ; the upper 
branch is broader than the low r er, and has the under 
surface hollowed, to admit of the under branch being 
closely pressed against it ; it has only the distal in- 
ferior margin furnished with hairs. The middle tail- 
piece is longer than the peduncle of the last pair of 
caudal appendages, narrow, and divided to nearly two- 
thirds of its length, and the lateral margins are bent 
to an angle. 
