jg CERIANTHARIA. 



(^6— 43 m) that are found in tlie cnido-glandular tract The craspedia sink gradually down more and 

 more into the endoderm, so that onh- a little part of the filament rises up out of the endoderm. They 

 have an oval form in transverse section |P1. 5 fig. n). Possibly the sinking depends in part on the 

 contracted condition of the filament. 



The musculature of the mesenteries is for a Cerianthid well developed. In the directive mesen- 

 teries, however, the musculature is feeble — Van Beneden has not even noticed any musculature 

 on these mesenteries — and the arrangement of the musculature too is hard to see. As I formerly 

 announced (1893 a, b) the musculature seems there to have an oblique course, on the top of the oral 

 part of the stomatodaeum the muscles seem to run transversely, lower down longitudinally. The rest 

 of the mesenteries have longitudiual muscles on the side remote from the directives, transverse ones 

 on the near side, the latter being the best developed. On the top of the aboral part of the stomato- 

 daeum the musculature of the mesenteries is very feeble and disappears altogether towards the 

 aboral side. 



The reproductive organs: The species is hermaphrodite with protomesenteries 2 and the meta- 

 mesenteries of the ist and and cycles fertile. Where the testes are sittiated, the endoderm shews 

 deep depressions. Danielssen's description of the reproductive organs as also of other points of 

 structure are so erroneous, that no part of the anatomical description is used here, as I have before 

 pointed out. Levinsen's I1S93I conjectiire, that separate males and females would be found anatomic- 

 ally differentiated from each other, is evidently based on Danielssen's description. 



Systematic Remarks. As I have made transverse sections of a specimen of C. borealis 

 Dan, and dissected another specimen, and have not been able to see that they are other than identical 

 with C. Iloydii, Danielssen's C. borealis must be rejected and only regarded as a synonym. The 

 specimens examined were from Molde and labelled "Bergens Museum 1866" from which the Copen- 

 hagen Museum acquired them. 



The specimen dredged by Jungersen at Hellebsek has rather shorter mesenteries than the 

 characteristic type but as other characters agree with C. Iloydii^ I have considered it as identical with 

 this species. In any case it cannot be referred to any other species of the Cerianthidae described by 

 me. A very small specimen from Kullen, dredged by Professor Sven Loven, most likely belongs 

 to the same species. 



As far as I have been able to judge, the specimen from Greenland collected by Wandel 

 also agrees with C. Iloydii, as regards the mesenteries. The arrangement of the tentacles however I 

 have not been able to examine in detail, as the specimen was partially damaged in the region of 

 the tentacles. The other specimens from Greenland belong undoubtedly to the same species as those 

 from Bohusliiu, as also the specimens from the Kara Sea. For further particulars I would refer to 

 the introduction to this work. 



Species Cerianthus vogti Dan. 

 Ceriaiithusvogti n. sp. Danielssen Norwegian North Atlantic Expedition 1900 p. 136, PL 5, figs. 



8-9, PI. 25, figs. 7—14. 

 » abyssornm » » >^ » » ,, igoo p. 143, PI. 5, fig. 7. 



