. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 68 HYDROIDA II the apophyses, which is here evident at the first glance. In this case, it would scarcelx- be possible for anyone to doubt that the specimen is a young Nemcrfesia^ the more so since the stem is strikingly tliick. Furtlier confirmation is in both instances afforded by the branch apophyses (c and e)\ in both colonies we find the characteristic "mamelou" on the upper side of the apophyse, close to the stem, wliich proves that the>- belong to the Ncincrtesia. The en
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 68 HYDROIDA II the apophyses, which is here evident at the first glance. In this case, it would scarcelx- be possible for anyone to doubt that the specimen is a young Nemcrfesia^ the more so since the stem is strikingly tliick. Furtlier confirmation is in both instances afforded by the branch apophyses (c and e)\ in both colonies we find the characteristic "mamelou" on the upper side of the apophyse, close to the stem, wliich proves that the>- belong to the Ncincrtesia. The entire arrangement of the hydrothecae and sarcothecae also shows that the species is Ncvicriesia rainosa. The stages found already show that the younger Nemertesia are throughout constructed after the PluDiularia type, with biserial apophyses, and that Semertcsia must be derived from Pliiuntlaria. It would further seem to suggest that Plunmlaria caulithcca Fewkes is probably a young stage of a. 200 m. 6ocm. (000 m. looom. l-'ij,'- XXXllI. Occurence of A'rm<'ftesia raniosn in the Northern Atlantic. In the hatched region the literature notes a common occurrence. Nemertesia. And it is likely tliat also other Plunmlaria species in reality cover young Nciiicrfesia species, and slionld, from the presence of a;"mamelon", be transferred to that genus. Among the synonyms of Nemertesia raiiiosa should also be reckoned Anteniiularia variabilis Krocli. The defective specimens, where only tlic chitinous parts are preserved, have lost all their sarcothecK, so that only a hole in the periderm, or a slightly raised part here and there, shows where the sarcothecae have been. The difficulty of discerning these remains has led to their being regarded as variable in number, and the remains or traces of supracalycine sarcotheca; had altogetlier escaped attention. Otherwise the colonies agree entirely with Nemertesia rainosa, and must thus be referred to that species. Nemertesia ramosa ha
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
