ACTINIARIA 12I 



same appearance as in H. duodecimcirrata. Perfect mesenteries 12, imperfect 12. Longitudinal pennons of 

 the perfect mesenteries very strong, with about 20 30 larger folds in the upper part of the reproductive 

 region. The large folds have numerous secondary folds. Parietal muscles and the imperfect mesenteries of 

 about equal appearance, mostly comparatively strong, in transverse-sections elongated with low, but rather 

 numerous folds. Expansion of the parietal muscles on the column considerable. All perfect mesenteries fertile. 

 Colour? 



Dimensions: Length unto 6 cm in contracted state, breadth unto 1,2 cm. Length of the tentacles 

 unto 0,5 cm. 



Occurrence: West-Greenland, Godhavn (Andersen). Holstensborg 20 fms. (Holm 1884). 



Nordre Stromfiord (Nordmann). Jacobshavn 120 fms. (1870). 

 Greenland without distinct locality. 

 E. of Iceland, 6^25' N. I2g' W. 211 fms. Temp, at the bottom 0,8 (Ingolf-Exp., 



St. 58). 



West Spitzbergen, Treurenberg bay 366 fms., Wijde bay 40 fms. (Sw. Spitzber- 

 gen-Exp. 1861), Mosel bay 3 fms. (Sw. Spitzbergen- Exp. 1862), 

 Bel Sound 5 fms. (Sw. Spitzbergen-Exp. 1861, Malmgren, 

 1864), Ice fiord Safe Harbour 30 fms. (Malmgren 1864), be- 

 tween Coles bay and Green bay 4 m (Sw. Spitzbergen-Exp. 1908), 

 Kobbe bay 3 fms. (1861). 



East Spitzbergen, Great Island 8oi5' N. 30 E. 95 m. King Charles Land. Eastside 

 of Jena Isl. 75 m (Romer and Schaudinn 1898, St. 37, St. 30). 

 Norway. Finmark (Loven). Outer part of the Kvaenang fiord 20 30 fms. (C. Au- 

 rivillius 1881). 



72io' N. 2037' E. (1868), Besimennaja bay 4 5 fms. (New 

 Zembla-Exp. 1875), New Zembla S. of Cape Goose 3 6 fms., 

 Cape Grebeni 8 10 fms. (New Zembla-Exp. 1875). 

 Kara Sea. Jugor Sound. Chabarova 5 8 fms (Vega-Exp. 1878). 



It is not necessary to describe this species in detail as I have before (1893) given a summary of its 

 anatomy. To this description I will, however, add some observations of the nematocysts, the spirocysts, 

 and the filaments. The size of the nematocysts and spirocysts in the different parts of the body is shown 

 on the following table, n nematocysts, sp spirocysts. 



Concerning the structure of the filaments the appearance of the intermediate streaks, and probably 

 also that of the ciliated streaks, somewhat recalls the Zoanthids. The ciliated streaks are, as we know, trans- 

 versely sulcated in the Actiniaria, as well as in the Zoanthids. The ridges between the furrows are not sup- 

 ported by mesogloeal off-shoots, but by thickenings of the epithelium. In the Zoanthids the furrows and the 

 ridges of the ciliated tract pass into similar furrows and ridges on the intermediate streaks, so that also these 

 latter become transversely sulcated. The ridges of the intermediate streaks are supported by mesogloeal 

 off-shoots, and a narrow band of the ciliated streaks covers the bottom of the furrows of the intermediate 



The Ingolf Expedition. V. 9. 



