48 G. o. SARS. M.-N. Kl. 



tail, and are oblong oval in outline, being about twice as long as thev are 

 broad, with the tip obtusely rounded, and the inner edge quite smooth. 

 The number of the marginal setae is the usual one, viz. 5 on each ramus, 

 4 issuing from the tip, the 5th being secured to a slight ledge of the 

 outer edge. 01 these setae the 2nd, reckoned Irom within, is the largest, 

 though scarcely attaining the length of the ramus. All the s setae are 

 densely plumous, and, as it were, bulbously tumehed at the base, their 

 outer part being very narrow and terminating in an extremeh' fine point. 

 Moreover, a very small, simple bristle is seen to issue from each ramus, 

 somewhat dorsally, between the 2 innermost of the marginal setæ. 



The eye is small, but distinct, and of a structure similar to that in 

 the genus Diaptoiniis, being located, somewhat ventrally, between the 

 insertions of the anterior antennae The ocular pigment is dark red. 



The anterior antennae (see llgs. i & 2) are not very much elongated, 

 scarcely exceeding in length the anterior division of the body. Thev are 

 composed of the usual number of articulations (25), and are provided, 

 anteriorly, with short bristles, the outmost articulations lieing also seti- 

 ferous at the posterior edge. In the living animal these antennae are 

 generally extended to each side, with the proximal part forming a slight 

 curve (see fig. 2). 



The posterior antennæ (Pl. 8, fig. i), as in other Calanids, consist each 

 of a biarticulate basal part and 2 diverging rami, the inner of which more 

 properly represents the immediate continuation of the basal part. This 

 ramus is composed of 2 somewhat compressed joints, the outer of which 

 is slightly lamellar and bilobed, carrying, at the tip, a dense brush of 

 slender ciliated setae. The outer ramus is very movably connected with 

 the basal part at some distance from its end, and appears less fully deve- 

 loped than in the genus Diaptonms, being scarcely longer than the inner 

 one. It is of a C3dindric, or somewhat subfusiform shape, and is divided 

 into 7 well defined joints, the 2nd of which is the largest and carries 3 

 setae, whereas each of the 4 succeeding joints, as well as the ist one, is 

 provided with a single seta only. The last joint is comparatively much 

 smaller than in the genus Diaptomzis, scarcely attaining the length of the 

 3 preceding ones combined. It is provided at the tip with 3 long setae, 

 and has, moreover, a much smaller one at about the middle of the inner edge. 



The labrum (fig 2) is rather large, fiap-shaped, and somewhat incised 

 on the tip. 



The mandibles (fig. 3) are very strong and of a structure similar to 

 that in the genus Diaptomus. Idie palp does not attain the length of 

 the mandible, but otherwise exhibits the usual structure. 



