. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 33. Textfig. 19. Edwardsia longicornis. Transverse section of a portion of the scapus between two mesente- ries with a nemathybome (ne). Denmark* Samsobelt (Winther), Cattegat without distinct locality (Petersen). The Sound S. of Hven 9 fms. (Gunhild Exp. 1878 st. 33), S. of Hven 17— 26 ni; of Wiken ("Sven Nilsson" st. 30, 52 c). Exterior aspect. The jiliysa is well-developed, the scapus provided with a thin periderm, with which is combined a rather thick and so
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 33. Textfig. 19. Edwardsia longicornis. Transverse section of a portion of the scapus between two mesente- ries with a nemathybome (ne). Denmark* Samsobelt (Winther), Cattegat without distinct locality (Petersen). The Sound S. of Hven 9 fms. (Gunhild Exp. 1878 st. 33), S. of Hven 17— 26 ni; of Wiken ("Sven Nilsson" st. 30, 52 c). Exterior aspect. The jiliysa is well-developed, the scapus provided with a thin periderm, with which is combined a rather thick and soft layer, connnonly ochre-coloured and probably, at least partly, formed by closely-packed mucus-particles. The comparatively few, but rather large nema- thybomes are arranged in 8 longitudinal lines as in E. tubcrculata (textiigs. 16 a, 19), quite another distribution than in E. pallida (text- fig. 16 b). The nemathybomes are generally distinct, only if the animals are very con- tracted or the periderm is loosened from the ectoderm, it is sometimes difficult to discern them. Also in contracted specimens the nemathybomes keep in the main the same position, though they are often a little displaced and approached to each other. The upper part of the column at stronger contraction shows a polygonal appearance wliich is more distinct in extended specimens. The tentacles are almost always 16, arranged in 2 cycles as in E. claparcdii (compare textfig. 10); in a very small ( X cm), but fertile specimen from Samso belt, sectioned by myself, I have not found more than 12 tentacles. Thus it looks as if the species could be ripe already in a stadium with 12 tentacles and with more than normally weak mesenterial muscles (compare below) \ at least in the Danish seas, where the genus moreover does not reach the same size as in Bohuslan. Perhaps we here meet with the same case as in Halcampa duodecimcirrata which is ripe in a stadium with only 8 perfect mesenteries and 10 tentacles
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
