238 
GAMMARID.E. 
mal is smooth. The tail has the four anterior segments 
with the dorsal margin in each posteriorly produced and 
elevated into a strong tooth ; the fourth is also marked 
by a dorsal sinus. The eyes are oblong. The antennae 
are subequal, slender, the superior having the two joints 
of the peduncle of nearly the same length, the first joint 
being furnished, at the infero-distal extremity, with a 
blunt tooth. The inferior antennae are a little shorter 
than the superior, and have the penultimate joint of the 
peduncle pubescent upon the upper surface. The first 
two pairs of legs are slender, and not very strong ; the 
hands having the palms oblique, and minutely pectinated, 
the anterior being the more coarsely marked. The next 
two pairs of legs are very slender and feeble, but the 
last three are somewhat more robust, and generally carry 
the fingers directed backwards. The caudal appendages 
reach nearly to the same length, and have their branches 
equal. In Montagu’s type specimen in the British Mu- 
seum the middle pair of appendages are rather shorter 
than the others. The terminal plate is very long, and 
split to about two-thirds of its length ; the margins are 
fringed with a few hairs, and the apex armed with a 
single spine on each side of the central division. 
This very pretty species, which for a long time ap- 
peared to find no generic resting-place, was first figured 
and described by Montagu, but his description was so 
short, and his figure so imperfect, that Prof. Milne- 
Edwards was unable to identify it with the species that 
he described and figured under the name of Amphitoe 
Marionis. Like Montagu, Milne-Edwards figured his 
species from a specimen which had been deprived of the 
central tail-piece, which articulates so delicately in this 
species, that it is very commonly absent even in recently- 
dredged animals. Montagu’s specimen is preserved in 
