REV. T. R. R. STEBBING—CRUSTACEA ISOPODA AND TANAIDACEA. 221 
segment is somewhat inflated except near the sinuous side margins and the 
narrowed blunt apex. 
The eyes are wide apart. The first antennze have the first joint, as usual, 
rather massive and suggestive of a composite nature, while the next joint, 
probably representing the true third, is as broad as it is long. The tapering 
flagellum consists of eight joints, the first of which is much the iongest. In 
the second antenne the fifth joint, though not elongate, is longer than any of 
the four preceding joints ; of the ten joints composing the flagellum the first 
and last are very short. 
The upper lip on each side of its rounded border shows a dark fringe 
of setules. In the mandibles the molar is prominent, the cutting-edge 
denticulate, with a secondary plate clear on the left mandible, but rather like 
a bifid spine on the right ; the first joint of the palp is longer than either the 
second or the third, the latter two carrying spine-fringes. The lobes on 
the fourth, fifth, and sixth joints of the maxillipeds are well marked, but 
short. 
The first gnathopod has on the long third joint a fringe of short setee on 
the hind margin, not long and natatory such as are found in the genus 
Spheroma ; on the projecting angle of its front margin there is a long spine, 
a similar one to which occurs on all the following limbs. These limbs are of 
the character usual in the genus, the longest being the fifth perceopods, 
between which ventrally are the pair of genital papille, these being, so far as 
my experience goes, of quite exceptional length. They are placed close 
together, taper each to a point, and appear to have finely crenulate margins. 
The second pleopods of the male have the masculine appendage on the 
inner branch something like that figured by Whitelegge for his Cercers 
nasuta, being of moderate length, comparatively broad, and quite smooth, 
but here the appendix is attached somewhat higher up on the branch and not 
straight but gently curved outwards. 
The uropods in the adult male bear some resemblance to those which 
Haswell has figured for his Sphwroma brevis, a species as to which further 
information is requisite. Here the outer movable branch is longer and much 
narrower than the round-ended fixed inner branch; it is serrulate and 
spinulose to a greater degree than the inner, and apically has a feebly 
bidentate appearance. In the smaller specimen, which is devoid of male 
characters, this outer branch of the uropods is not longer than the inner 
branch. 
Length of adult male 3°5 mm., breadth 1:75 mm. Smaller specimen, sex 
undetermined, length 3 mm., breadth 1-5 mm. 
Locality. Red Sea, 1904/5, Misc. 68. 
The specific name refers to the reticulate or net-like appearance of the 
integument as seen under the microscope. 
