of the Fishery Board for Scotland. 279 
The female of this species, as already described, resembles to some 
extent that of Diosaccus tenwicoriis, Claus, in its general appearance, but 
is probably somewhat larger. It measures about 1mm. (or 54 of an 
inch) in length, exclusive of the tail setz (fig. 19). 
The antennules (anterior antenn#) are moderately elongated, and com- 
posed of eight joints; the first four joints are moderately large, and are 
together considerably longer than the entire length of the last four. The 
fifth joint is little more than half the length of the preceding one and 
about two-thirds of the length of the sixth joint. The end joint is about 
equal in length to the fifth, but the penultimate one is considerably 
shorter, as shown in the drawing (fig. 20). 
The outer and inner rami of the posterior aintenne are both of them 
biarticulate. The outer ramus, which has the joints subequal, is short, 
and furnished with about three short sete. The inner ramus is moder- 
ately stout (fig. 21). 
The mandibles are stout, and possess a broad and somewhat obliquely 
truncated biting edge, which is irregularly but distinctly dentated. 
Mandible palp of moderate size, and provided with a single terminal uni- 
articulate branch (fig. 22). 
The maxille are moderately stout and compact, and the masticatory 
lobe, which is short, and obliquely truncated, is armed with a number of 
tolerably strong spines of varying lengths; the palp is fairly well 
developed (fig. 23), and consists of several lobe-like processes as shown. 
Second maxillipeds robust, and armed with a stout elongated terminal 
claw (fig. 24). 
The first pair of thoracic legs have both branches three-jointed; the 
first joint of the inner branch is considerably elongated, but the second 
and third are very short and subequal, and the end one is armed with 
two terminal claw-like spines, one being moderately long and one short; 
a small seta also springs from near the distal end of the inner margin of 
the first joint. The outer branch is little more than half the length of 
the inner one; the first two joints are subequal, but the third is short, and 
furnished with several spiniform sete, as shown in the drawing (fig. 25). 
The second and third pairs, which have also both branches three- 
jointed, are moderately stout, and the outer and inner branches are of 
nearly equal length. In the second pair the first joint of the inner branch 
is rather shorter than the second, and it carries a single seta on the inner 
margin; the second joint carries three sete, and the end joint one seta, on 
the inner margin ; the end joint.is also provided with three terminal sete, 
but the outer one is short. The outer branch has the end joint rather 
longer than the preceding one, and furnished with two elongated set on 
the inner margin, two moderately long spines on the outer margin, and 
three apical setz of different leneths; the first and second joints are each 
furnished with a moderately long spine on the outer distal angle, and an 
elongated seta on the inner margin (fig. 26). 
In the fourth pair the outer branch resembles that of the second pair 
in stoutness and armature, but the inner branch is slender and short, and 
composed of only two joints; the first joint, which is narrow and shorter 
than the second, bears a seta on the inner margin; the second joint 
scarcely reaches beyond the end of the middle joint of the outer branch, 
and carries five setz round its distal extremity (fig. 27). 
In the fifth pair the outer and inner margins of the basal joint are 
nearly parallel; the distal end is obliquely truncated and slightly convex, 
and bears four moderately long marginal sete, so arranged as to be nearly 
equidistant from each other. The secondary joint is broadly oval in out- 
line, and extends considerably beyond the end of the basal joint; it 
