of the Fishery Board for Scotland. 



207 



molgus poucheti, Canu ; the broad anterior margin of the basal portion is 

 distinctly furrowed, the furrows extend to the edge, and give to it a 

 crenate appearance (fig. 4), maxilla (a) with three terminal setae. The 

 moderately long slender extremity of the anterior foot-jaws is strongly 

 pectinate on the upper edge, but plumose towards the end ; a stout and 

 strongly plumose seta, equal to about a third of the length of the slender 

 terminal part of the foot-jaw, springs from the inner edge of the base, 

 where there is also a small seta on the lateral aspect. Posterior foot-jaws 

 of the female three-jointed ; the first and second joints, which are sub- 

 equal in length, are of moderate size, but the last joint is small ; two 

 seta? spring from near the middle of the second joint; the third joint, 

 besides being furnished with a stout terminal seta, is armed at the apex 

 with a robust conical spine, somewhat longer than the joint to which it 

 is articulated (fig. 6). The posterior foot-jaw in the male is armed with 

 a long, curved, terminal claw, fully twice the length of the joint from 

 which it springs (fig. 7). In the female the fifth pair of feet are elongate ; 

 they reach to nearly the end of the genital segment of the abdomen ; the 

 whole of the upper portion of each foot is clothed with short aculeate 

 setae; the fifth pair in the male are much shorter, and without setae. 

 Female abdomen slender, and composed of five segments. Genital seg- 

 ment comparatively small, but fully twice the length of the next ; breadth 

 about equal to the length ; the remaining four segments are nearly equal 

 to each other in length. Caudal stylets fully one and a half times longer 

 than the last abdominal segment, and provided with one subterminal and 

 four apical setae ; the second seta from the inside is considerably longer 

 than the others, being equal to the entire length of the abdomen. Genital 

 segment of the male abdomen large, subquadrate, the sides slightly con- 

 vex, the distal end truncate, and bearing two small setae on each side of 

 the following segment ; the length of the genital segment is about equal 

 to that of the other four segments and the caudal stylets combined. The 

 caudal stylets of the male are somewhat shorter than those of the female 

 (fig. 12). 



The fifth pair of feet in the female of this species form a well-marked 

 and distinctive character. 



Habitat. — 'Rath Ground,' a short distance north of the Bass Rock, 

 Firth of Forth. 



Genus Modiolicola, Aurivillius. 



Modiolicola insignis, Aurivillius. (PI. IV. figs. 13-24.) 



1883. Modiolicola insignis, Aurivillius, ' Akademisk Afhandling,' 



Stockholm (1883), p. 10, t. ii., figs. 1-10; t. iv., figs. 1-8. 

 1885. Lichomolgus insignis, Raffaele e Monticelli, ' Mem. d. R. 



'Accad. d. Lincei,' ser. 4, vol. i. p. 302, figs. 13-16. 

 1892. Modiolicola insignis, Canu, 'Les Copep. du Boulon.,'p. 238, 



pi. xxiv. figs. 14-20. 



Length 1 -2 mm. (^g-th of an inch). Cephalo-thorax broadly ovate ; 

 abdomen elongate, narrow, and equal to about two-thirds the length of 

 the cephalo-thorax. First cephalo-thoracic segment subtriangular, and 

 equal to the combined length of the other four thoracic and first 

 abdominal segments. Forehead narrowly rounded. Anterior antennae 

 short, scarcely half the length of the first bony segment, seven-jointed, 

 the second joint much longer than any of the others. The subjoined 

 formula exhibits the relative length of the joints : — 



8 • 17 ' 4 • 8 • 10 • 7 • 4- 

 1 ' 2 ' 3 ' 4 • 5 ' 6 • 7' 



