ACTINIARIA 

 42 



the most conspicuously in the specimens a and b ; in c the folds are sticking together so that the outline seems 

 to be more even. On the pennon-side the endoderm is, on the other hand, richly provided with vacuoles. 

 The outer, lamellar part of the mesenteries is attached to the pennon, close by its outside. The parietal muscles 

 (textfigs. 36 — 38) are comparatively strong, now fan-shaped, now — especially in the distal part — elongated 

 towards the centre. The shorter folds are mostly situated in the inner part of the muscle. The expansion 

 of the parietal muscles on the colunm is rather considerable. The ciliated streaks are well-developed. The 

 species is dioecious. 



Edwardsia fusca Dan. 

 Edwardsia fusca n. sp., Danielssen 1890 p. 112, PI. 5, fig. 6, PI. 19, figs. 5 — 9. 



Diagnosis. Physa well-developed, ampuUaceous. Scapus with a well-developed, incrusted peri- 

 derm, polygonal, with 16? rows of small nemathybomes. Their nematocysts about 31 — 36 X (2) — 2.5/^. 

 Capitulum polygonal. Tentacles 12. Nematocysts of the tentacles 24 — 27 X 2.5 /i, their spirocysts 14 X 1.5 

 — 26 X 2.5 fi. Nematocysts of the actinopharynx 36 — 46 x 2,5 — 3 ju. lyongitudinal muscle-pennons of the 

 mesenteries rather strong, in the ciUated tract with 15 — 20 especially in the outer part riclily ramified folds. 

 Outer lamellar part of the mesenteries attached (in the ciliated tract) close by the outside of the pennons. 

 Parietal muscles somewhat strong with rather numerous transversely elongated folds. Expansion of the 

 parietal muscles on the column probably the ordinary one. 



Colour. Capitulum brownish-red with 12 rather broad, dark-auburn lines, between which paler 

 longitudinal areas are observed. Oral disc flesh-coloured with two brown annuli of small, brown patches. 

 Tentacles with 3 dark-brown annuU. Scapus brown, physa flesh-coloured (Danielssen). 



Dimensions in extended state: Length of the body, tentacles included, 5.5 cm, scapus 2.8 cm. Ca- 

 pitulum 1.2 cm (Danielssen). The strongly contracted specimen, sectioned by myself, was about i cm long. 



Occurrence. 70°36' N. 32°35' E. 271 m clay. Bottom temperature i°9. (Norwegian North-Atl.- 

 Exp. St. 262) I sp. 



Exterior aspect. The physa is ampullaceous, well-developed and provided with 8 fine, longitudinal 

 lines (probably the discernible insertions of the mesenteries). The scapus is provided with a strongly 

 incrusted periderm, its form is cylindrical. Between the insertions of the mesenteries there are 16 rows of 

 small nemathybomes in all, two in each compartment (Danielssen). (In the specimen, examined by myself, 

 the nemathybomes were indistinct and seem to be more irregularly arranged, it is therefore questionable, 

 if the nemathybomes are arranged in such a way as stated by Danielssen. The mesenterial farrows were 

 indistinct in the proximal part, distinct in the distal one.) The capitulum is well-developed, in the distal part, 

 close below the oral disc, provided with 12 ridges, proximally reduced to 8. According to Danielssen there 

 are papillae (nemathybomes?) in the physa as well as on the capitulum. (This statement is certainly not 

 correct, as the nemathybomes of Edwardsia never appear on the capitulum nor on the physa.) The tentacles 

 are 12 in number. The oral disc is inconsiderable. Actinopharynx and siphonoglyphe ? — The above descrip- 

 tion is compiled from that of Danielssen, I have placed my own remarks in brackets. 



Anatomical description. Danielssen has described this species anatomically, but in most 



