. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HVDROIDA 41 extended polyp; they are without rings; at most there is some faint and irregular wrinkling here and there. The polyp is fusiform with the tentacles irregularly distributed all over the surface; the polyp may be retracted into the broader distal portion of the hydrocaulus. The structure of the gonophores seems to be strongly reduced. They are developed at the upper part of blastostyles without tentacles, at most 1 mm. high. Material: The Faroe Islands: 13 miles West to South of Munken, depth 150 fath. (on Cardium
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HVDROIDA 41 extended polyp; they are without rings; at most there is some faint and irregular wrinkling here and there. The polyp is fusiform with the tentacles irregularly distributed all over the surface; the polyp may be retracted into the broader distal portion of the hydrocaulus. The structure of the gonophores seems to be strongly reduced. They are developed at the upper part of blastostyles without tentacles, at most 1 mm. high. Material: The Faroe Islands: 13 miles West to South of Munken, depth 150 fath. (on Cardium sp.). — 9 — East South East of Bispen, — 70 — ( - - ).. 20om. - — 600m. ._ ....(Doom. 2000m. Text-fig. L. Localities of Merona corimcopiae • and Monobrachium parasitum A in the Northern Atlantic. Merona corimcopiae was first described as a Tubiclava by Norman (1864). But as the latter genus is characterized by the gonophores being borne on the polyps, he thought he had better set up a new genus Merona (1865) for the species in hand, bearing its gonophores on polyps strongly reduced or on blastostyles. This criterion, however, is of subordinate importance and would by no means justify the separation of two genera. However, from the drawings occurring in literature, a much essential point of difference urges itself. The perisarc of the species of Tubiclava is not so wide that the polyp can be retracted into it, while this is the case with Merona. The division, therefore, seems well founded. But at any rate a renewed examination of the two genera is needed. Merona eornucopiae seems only to occur attached to shells of living mollusks, and has been found on species of the genera Cardium, Astarte, and Dentaliitni. The species does not seem to be very frequent; it has previously been recorded from the sea to the north of the Shetlauds at the depth of 80—100 fathoms, and from the coast of Northumberland. To these localities are now to be The Ingolf-Exrcdition. V. 6. 6. P
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscientificexpedition
