of the Fishery Board for Scotland. 



271 



//ft/>?7a/^.— Kilbraiinan Sound, 1886 ; Otter Spit, Loch Fyne, 1887. 



Reinai'hs. — This Copepod, though closely allied to Ascomy/.on^ differs 

 in one or two points from the characters which distinguish that genus. 

 The mandible palp is comparatively short, and the hairs of the mandible 

 palp and maxillae are plumose. The number of seta? on the last joint of 

 the outer and inner branches of the swimming feet is probably also 

 dissimilar, but otherwise it appears to agree with the genus to which it is, 

 for the present, ascribed. 



Neoponfius angidaris, gen. et sp. n. (PI. XIV., figs. 1-11). 



Description of the female. — Length, 1*36 mm (yV of an inch). The 

 thorax, seen from above, is moderately broad and sub-angular, the third 

 and fourth segments are produced laterally and posteriorly almost to the 

 distal end of the narrow fifth segment, causing the posterior part of the 

 thorax to terminate somewhat abruptly ; the forehead is also broadly 

 rounded. The abdomen is long and slender, and composed of four seg- 

 ments ; the anterior portion of the genital segment is scarcely broader 

 than it is posteriorly ; this segment is fully equal to the combined length 

 of the next three. The caudal stylets are elongate and comparatively 

 broad ; they are rather longer than the last two abdominal segments (fig. 

 1). The antennules are short and twelve-jointed ; the first two and last 

 joints are longer than the others ; the third to the sixth are very short, while 

 the last four joints are distinctly i*arrower than the basal joint ; the 

 festhetask springs from the end of the last joint (fig. 2). The formula 

 shows the proportional length of the joints — 



27 • 27 • 5 • 5 • 5 • 5 • 10 • 8 • 18 • 12 • 15 • 30 

 1 • 2 • 3 • 4 • .5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 



The antennse are small, and the secondary branches consist of a single 

 small joint, having two minute hairs (fig. 3). The mandibles are stylet 

 shaped, being very long and slender ; there appears to be an intermediate 

 joint, but somewhat nearer the distal than the proximal end ; the man- 

 dibles are also armed with a few minute lateral teeth that extend a short 

 distance back from the apex (fig. 4). The maxillae are moderately large ; 

 the principal branch is cylindrical and about four times longer than 

 broad, the other is narrower and slightly tapering and equal to about two- 

 thirds of the length of the larger ; the smaller branch is provided with 

 three, the larger with four plumose setae (fig. 5). The foot-jaws somewhat 

 resemble those of Disjpontius, but the claws of the anterior pair are strong 

 and powerful, and have a stout seta on the inner aspect, also a small 

 spine exteriorly (fig. 6) ; the claws of the posterior pair are more slender 

 (fig. 7). All four pairs of swimming feet have both branches three- 

 jointed ; the inner branches of the first pair have no terminal spines ; the 

 marginal spines of the outer branches are short and stout ; the end-joint 

 of the inner branches has three setae on the inner margin, two at the apex, 

 and one on the outer margin, while the end-joint of the outer branches has 

 four setae round the inner margin and apex (fig. 8). In the fourth pair 

 both branches are armed with broad, sword-like spines ; the inner branches 

 are rather narrower than the outer, and the last joint bears two setae on 

 the inner margin and one on the outer margin ; there is also a small 

 supplementary apical seta ; the end-joint of the outer branches is provided 

 with five setae on the inner margin (fig. 9), Fifth pair of feet moderately 

 large, sub-quadrate in outline, the outer margin straight, inner margin 



