. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fig. 6. ophioclenis, larva. In spite of the fact that the inner organisation eonld not be investigated, there is not much doubt that they are <$ and not specimens with retarded development. (The <$ was not described by Djakonov). The shell is much compressed, not globular as in $. There are no dorsal processes on the thorax, and the antennulae and oral parts do not differ from those of $. But the legs are much simpler, not bifid, and not articulate (only in the $ from st.
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fig. 6. ophioclenis, larva. In spite of the fact that the inner organisation eonld not be investigated, there is not much doubt that they are <$ and not specimens with retarded development. (The <$ was not described by Djakonov). The shell is much compressed, not globular as in $. There are no dorsal processes on the thorax, and the antennulae and oral parts do not differ from those of $. But the legs are much simpler, not bifid, and not articulate (only in the $ from st. no (fig. 5) the penultimate leg seems to have a single articulation. It was extremely difficult to trace the number of legs. 4 pair are dis- tinct and provided with setae; but in the $ from st. no there is at all events 1 pair (possibly 2) anterior of the first pair with setae; in the $ from st. 105 there is possibly one pair at the same place. As to the number of abdominal segments there is a disagreement between the two drawn speci- mens: that from st. 105 (fig. 4) has 5 segments, that from st. 110 (fig. 5) only 4. Both of the speci- mens have ventral projections on the hind part of 5th segment reckoned from behind: a simple bud (spec, from st. 105), or an oval plate lying on each side laterally of the posterior leg (spec, from st. no). The abdomen is curved, with the dorsal side of the last segment and of the ab- dominal appendages bent towards thedorsal side of the anterior segments. None of the abdominal segments is much elongate, and the penultimate segment has no ventral (posterior) projection as in $. The abdominal appendages are compara- tively longer (especially in the spec, from st. 110) than in $; they are finely serrate on the dorsal margin and have apically 1 long and 3 shorter spines each, but no spines on the ventral side. Ova. Almost all the specimens have ova. These are kept in the cavity inside the shells and fill it totally, being present, as they. Fig. 7.
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
