. Le Ingolf-Expedition danois. Expéditions scientifiques ; l'océan Arctique. 26 Les annélides. I. bord convexe de l'échelle (PI. I, fig. 4) sont vus à la loupe plusieurs arrondies, peu accentuées, papilliform, une partie de ce qui est également répartie sur la surface de la moitié latérale de l'échelle à l'intérieur du rebord. Examinée au microscope chacun de ces organismes s'avère être fourni avec un seul thread-papille en forme peu (PI. I, fig. 1), ce qui évoque l'Hannothoe* mollis, décrit à partir de l'Christianiafjord par le SRAS. Cependant, la forme des institutions dans les deux espèces est

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. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 26 ANNELIDS. I. convex edge of the scale (PI. I, fig. 4) are seen under a lens several rounded, not very prominent, papilliform bodies, a part of which is also spread over the surface of the lateral half of the scale within the edge. Examined under the microscope each of these bodies proves to be provided with a single little thread-shaped papilla (PI. I, fig. 1), a fact which calls to mind Hannothoe mollis, * described from the Christianiafjord by Sars. However, the respective shape of the named bodies in the two species is rather different; in H. mollis the bodies in mention are rather lengthened, almost cylindrical or conical with rounded apex; in the species from the Iugolf-Expedition they are short, thick, almost dome-shaped or mammiform; some of them are constricted at the base, rendering the shape more ovoid; but each of them carries on the apex the above named filiform papilla, in aspect quite like those which Sars describes and figures in his H. mollis. In other respects there is hardly any resemblance between the two species. The proboscis not being protruded I cannot say anything about this organ. The foot (fig. 8) is nearly as high as long; its two branches taper to a rather pointed apex; each of them is provided with a strong acicle. The dorsal cirrus — lacking in the parapodium figured — is rather long and tapers in a short filament. Near the base of the dorsal cirrus, and median to this, is situated a warty prominence resembling the elytrophore in those segments where the scales have dropped off, but it is not quite as prominent and a little more pointed in shape. There are no corresponding prominences of that sort in the scale-carrying segments. Some few papillae of the usual clavate form are seen on the dorsal as well as on the ventral cirrus. The segmental papillae are only very little prominent. The setae of the notopodial branch (PI. II, figs. 10—n) are relatively slender;

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