of the Fishery Board for Scotland. 207 
molgus pouchett, 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 sete. 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 
setze 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 
sete ; the fifth pair in the male are much shorter, and without sete. 
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 sete ; 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 sete on each side of 
the following segment; the length of the genital segment is about equal 
to that of the other four secments 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 wmsignis, Aurivillius. (Pl. 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 é 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, 
pl. xxiv. figs. 14-20. 
Length 1:2 mm. (5th 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 
equai to the combined length of the other four thoracic and _ first 
abdominal segments. Forehead narrowly rounded. Anterior antenne 
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 :— 
Soke. 49-89 LOS Go 4: 
|e 1 aor gs UP. LSC Ora: 
