of the Fishery Board for Scotland. 



279 



The female of this species, as already described, resembles to some 

 extent that of Diosaccus tenuicomis, Claus, in its general appearance, but 

 is probably somewhat larger. It measures about 1mm. (or of an 

 inch) in length, exclusive of the tail setae (fig. 19). 



The antennules (anterior antennae) 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 antennae are both of them 

 biarticulate. The outer ramus, which has the joints subequal, is short, 

 and furnished with about three short setae. 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 maxillae 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 setae, 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 setae, and the end joint one seta, on 

 the inner margin ; the end joint is also provided with three terminal setae, 

 but the outer one is short. The outer branch has the end joint rather 

 longer than the preceding one, and furnished with two elongated setae on 

 the inner margin, two moderately long spines on the outer margin, and 

 three apical setae of different lengths ; 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 setae 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 setae, so arranged as to be nearly 

 equidistant from each other. The secondary joint is broadly oval in out- 

 liue, and extends considerably beyond the end of the basal joint; it 



