Rey. T. R. R. Stebbing on Sesstle-eyed Crustaceans. 31 
III.—Notes on Sessile-eyed Crustaceans, with Description of a 
new Species. By the Rey. Toomas R. R. Sressrne. 
[Plate V.] 
Caprella fretensis, n. sp. (Pl. V. fig. 1.) 
The head of this species has a small rostrum, acute in ap- 
pearance when viewed laterally, but obtuse when seen from 
above. ‘The eyes are small, ovate, slightly protuberant within 
the narrow bounds of the head, which is distinguished from 
the first pereion-segment only by a minute groove above, the 
sides being continuous and converging backwards to the 
junction of the first with the second segment; the latter is 
long and narrow, widest near its termination, where it receives 
the insertion of the second gnathopods. The third, fourth, 
and fifth segments are considerably shorter than the second ; 
in one specimen they are also decidedly shorter than the 
combined head and first segment, but in another specimen 
they are nearly equal to them; the third and fourth seg- 
ments are widest at the branchial vesicles, the fifth at the end 
where the legs are attached ; the sixth segment is the widest 
of all, but only about half the length of the fifth; the 
seventh is no longer than the sixth, and much narrower. 
The pleon is half concealed by the hinder margin of the last 
pereion-segment ; it occupies about a third of the width of 
that margin, beyond which can be seen a pair of minute 
style-like processes or one-jointed pleopoda, and between 
these a more conspicuous pair with short convergent pedun- 
cles and divergent oval rami. 
The upper antenne have the first jomt longer than the 
head, and stout by comparison with that somewhat insignifi- 
cant organ. ‘The second joint is much longer, the third some- 
what shorter than the first; the second is a little, and the 
third a good deal furred on the under margin, chiefly towards 
the distal end. The flagellum, of fourteen articulations pretty 
uniform in length, tapers gradually to a point; almost all 
the articulations carry two “olfactory” filaments. The 
lower antennee do not reach to the end of the second joint of 
the peduncle of the upper. The first portion that projects 
distinctly from the head is a very short joint; to this suc- 
ceeds oné twice its length, but still short. The next is nearly 
double these two combined, more slender, curved, and orna- 
mented with two rows of cilia beneath. The next portion is 
still longer and has longer fringes. The piece that succeeds 
to this is of equal length but diminished breadth and shorter 
fringes. Lastly follows a short, narrow, unfringed piece, 
