. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. coria'ODA 147 Ri of the inaxillulae and the presence of a Se Re I pes I. The two (reuera arc very nearly related, but as the five species of Uiidcuclnrtc form a very natural oroup I prefer to refer this species to V/ 42. Chirudina abyssalis u. sp. (PI. V figs 5 a—f; text-figs 40 a—c). Description. i% Size of specimen from Thor St. 183 was 5-4 mm.; anterior 43 mm.; urosome 11 mm. The head is gradually rounded in front, without any crest; the rostrum is rather short, b
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. coria'ODA 147 Ri of the inaxillulae and the presence of a Se Re I pes I. The two (reuera arc very nearly related, but as the five species of Uiidcuclnrtc form a very natural oroup I prefer to refer this species to V/ 42. Chirudina abyssalis u. sp. (PI. V figs 5 a—f; text-figs 40 a—c). Description. i% Size of specimen from Thor St. 183 was 5-4 mm.; anterior 43 mm.; urosome 11 mm. The head is gradually rounded in front, without any crest; the rostrum is rather short, but strong, directed downwards and slightly backwards (text-fig. 40 a). The cephalothorax, which is moder- ately slender and slightly attenuated towards the front part as well as towards the end, is about 2-5 as long as wide; the first thoracic tergite is, at least dorsally, well separated from the head; the fifth somite, which is well separated in front, is laterally' not produced, and has evenly rounded corners (fig. 5 a). The anterior division is about four times as long as the abdomen. The genital somite, which is a little wider than deep and as deep as long, is in dorsal outline almost synnnetrical; the ventral surface is anteriorly rather suddenly produced and posteriorly gradu- ally sloping; the genital area is in ventral view seen to be somewhat different from that of the preceding si^ecies. The genital somite possesses, dorsally, along hinder margin, short hairs, and ventrally tufts of longer hairs; the fol- lowing somites are more and less hairy, the hairs being longest dorsallx' and \-entrall\'. The caudal rami are about as long as wide; the terminal setae are distinctly shorter than the abdomen and about three times as long as the Si. The antciniitlar extend to the end of the caudal rami; the measurements are very like those of the preceding species. The exopodite of the oiiteiniac is i-6 as long as the endopodite; the second segment of the endopodite has 8 setae
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
