490 Messrs. T. and A. Scott on 
more important points of difference between this parasitic 
Copepod and Canuel/a, and also the close relationship between 
these two and the genus Longipedia, Claus. 
Sunaristes paguri, Hesse. 
(Pl. XT. figs. 1-10; Pl. XIT. figs. 2-7.) 
1867. Sunaristes paguri, Hesse, Ann, des Sci. Nat. sér. 5 (Zool.), vol. vii. 
p. 205, pl. 
1884, Longipedina paguri, W. Miiller, Archiv fiir Naturg. Jahrgang 50, 
Band 1, p. 19, pl. xiii. 
Description of the Female.—¥igure 1 (Pl. XI.) represents 
an adult female of Sunaristes pagurt from the Cromarty 
Firth; it is an elongate and comparatively slender Copepod, 
and measures fully 3 millim. (4 of an inch) in length, exclusive 
of tail-setz ; the first body-segment is somewhat more robust 
than the others, the rostrum is large and conspicuous; the 
first abdominal segment, which is about equal in length to 
the second and third together, is composed of two completely 
coalesced somites, and is provided with hook-like appendages 
on the underside and near the proximal end (fig. 4, Pl. XIL., 
exhibits these appendages seen ventrally) ; the caudal stylets 
are fully twice the length of the, last abdominal segment. 
The antennules (Pl. XI. fig. 2) are short, moderately stout 
and setose, and consist of five more or less subequal joints, 
but the penultimate joint is rather shorter than the others. 
The antenne (PI. XI. fig. 3) are similar to those of Canuella 
and Longipedia. The mandibles (Pl. XI. fig. 4) and other 
mouth-organs (Pl. XI. figs. 5-7) also closely resemble those 
of the same two genera. ‘The swimming-feet resemble those 
of Canuella, except that the inner branches of the fourth pair 
are proportionally somewhat shorter (see Pl. XII. figs. 2 and 3, 
which represent the first and fourth pairs). The fifth pair 
(Pl. XI. fig. 8), which are somewhat rudimentary, are each 
furnished with a long and moderately stout seta on the outer 
angle and with three elongate spines interiorly. 
Description of the Male.—'Lhe antennules of the male 
Sunaristes (Pl. XI. fig. 10), which, like those of the female, 
are short and stout, terminate each in a strongly developed 
hand with a stout brownish-coloured movable claw; they 
form powerful grasping organs and by their robust structure 
give the Copepod a somewhat remarkable appearance. The 
antenne, mouth-organs, and swimming-feet are all more or 
less similar to those of the female, with this important excep- 
tion, that the first two joints of the inner branches of the 
second pair of feet are produced distally into strong and some- 
what spiniform processes that extend almost to the extremity 
SOS TIN epic Se 
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