194 
GAMMAR1D M. 
the hands gradually increase in their diameter towards 
the palm, which occupies the anterior margin : it is con- 
vex, but its limit is not defined, but gradually rounded 
into the inferior margin, and slightly fringed with 
hairs. The third and fourth pairs of legs are also uni- 
form, and furnished along the posterior margins of the 
wrists and hands with strong stiff spines, which appear 
to have the capability of being brought into contact with 
each other, and so of obtaining a prehensile power. The 
next pair of legs have the thigh gradually dilated, and 
the posterior margin of the succeeding joints furnished 
with long plumose hairs, and the anterior margin 
with fasciculi of spines : they terminate in a knife- 
shaped finger, the anterior margin of which is entire. 
The last two pairs of legs are uniform ; they are fur- 
nished with a few short hairs and spines, and terminate 
in a straight finger. The antepenultimate pair of caudal 
appendages have the branches very unequal, whilst those 
of the penultimate are equal, as are also those of the 
ultimate, which are much longer, and have the inner 
branch covered with plumose hairs, whilst the outer one 
is clean, and tipped with a short spine at the extremity. 
The terminal plate or tail-piece is double, each division 
being tipped with a small central spine, flanked on each 
side with a minute hair. 
We received this species from our kind correspondent, 
Mr. Gregor, of Macduff, who took it in the Moray 
Frith. It is named in compliment to the indefatigable 
author of the “ History of the British Entomostraca.” 
