70 ~=©Mr. C. Spence Bate on a new Genus of Macrura. 
fringed with long hairs at the broad and leaf-like extremity ; 
the fourth is fringed with a few hairs on the inner side and 
apex only ; whereas the fifth or posterior branch is fringed 
with cilia all round, the hairs being centrifugally arranged 
with their extremities slightly curved towards the anterior 
point. 
The third siagonopod (g) is six-jointed and biramose. The 
first and second joints are produced on the inner side in the 
form of two large foliaceous plates, the margins being 
fringed with a series of fasciculi of long and stiff hairs; the 
plate of the second joint is produced beyond its distal 
extremity or outer portion, from which it is distinctly 
separated for about half its length, and the distal extremity 
of the joint has the inner angle furnished with a bundle of 
long hairs. 
Succeeding these, four other joints are successively pro- 
duced, being subequal in length, of which the penultimate 
is the longest and the last the shortest, each gradually narrow- 
ing in diameter and tapering to the distal extremity, and 
each furnished with a fasciculus of hairs at the inner distal 
extremity; on the outer side a second branch, a true bas- 
ecphysis, projects, the base of which consists of a long and 
robust joint furnished on the outer margin with a few simple 
hairs and continued at the extremity into a multiarticulate 
ramus, which is nearly smooth or only sparsely furnished 
with hairs. 
The first pair of gnathopoda (A) are pediform and biramose, 
the basecphysis being well developed and reaching rather 
beyond the extremity of the dactylos. The coxal joint is 
short and broad, and supports on its anterior and outer wall 
a small podobranchial plume. The basisal joint is long and 
stout, theanterior margin is longitudinally concave, smooth,and 
produced somewhat beyond its articulation with the ischium, 
whereas the posterior margin is convex and adorned with 
three rather large fasciculi of short, stiff, and simple hairs. 
The ischium is a little shorter than the basis and about half 
its diameter in breadth ; it is smooth on the upper or anterior 
surface and thickly studded with short, simple, and rather 
stiff hairs on the posterior margin. ‘The meros is shorter than 
the ischium, somewhat pear-shaped in form, having the nar- 
row portion towards the ischium and the larger towards the 
carpus; the upper or anterior margin is smooth and con- 
vex, while the lower is smooth and waved, being concave 
towards the ischium and convex towards the carpus; the lobe 
and distal margin are fringed with a few long simple hairs. 
‘he carpus is subequal in length with the ischium, cylindrical 
