ACTINIARIA (,^ 



effect of light. The animal when kept in an aquarium easily throws off its scapus-cuticle, and thereafter 

 wanders about by means of its proximal end which thus becomes flattened, disc-like (compare above). It can 

 besides attach itself by the sides of its body. The suckers which, according to Gosse, should be found in 

 this species are, however, not present, neither are the " Halcampa-papillaQ" , characteristic of Paraedward- 

 sia. The attachment wliich is, however, never firm, is performed exclusively by the secretion of the nume- 

 rous gland-cells. The animal successively forms a new cuticle. On the biology of this animal Gosse (i860) 

 tnoreover gives several informations. 



Remarks: Haddon (1889) has reproduced some figures of this species. The habitus-figure (PI. 33, 

 fig. 15) represents a rather badly preserved specimen, the cuticle of which is for the greater part peeled off. 

 Of the anatomical figures of the species only one, showing the parietal muscles, is of use to the identification 

 which I can determine by a study of Haddon's sections. Though I have not been able to make more exact 

 measurements of the stinging capsules I have, however, ascertained that the nematocysts of the scapus of 

 Haddon's specimens were of the same appearance as those of the Swedish representative of the species, 

 and arranged in groups. The Swedish form is also identical with the British one; on the other hand, the species 

 which Appellof (1893) has described as E. caniea is a Paraedwardsia (compare P. sarsii). Gosse's figures 

 of the species are rather good, especially the uncoloured ones. I have myself reproduced some figures of ana- 

 tomical details, one of these is here once more reproduced. 



Milne-Edwardsia polaris n. sp. 



Diagnosis: The most proximal part of the body without cuticle, physa-like. Scapus with rather 

 feebly developed cuticle, with comparatively few nematocysts (14—22 X 2, 5 — 3.5 11), arranged in groups 

 winch sometimes are placed in shallow sinkings in the mesogloea. Capitulum polygonal. Its ectoderm with 

 nematocysts, 14 — 17 fi long. Tentacles 12. The ectoderm of the tentacles with comparatively few spirocysts, 

 12 — 19 // long, and nematocysts, 15 — 22 X 2,5 jt in size. Nematocysts in the ectoderm of the actinopharynx 

 numerous, 16 — 24 X 2, 5 — 3 fi. Longitudinal muscle-pennons of the mesenteries in transverse-sections 

 through the upper part of the reproductive region with about 12 — 15 folds, branched in the outer parts of 

 the pennons and sometimes also a little in the inner parts. The outer parts of the mesenteries issue not far 

 from the outer side of the pennons. Parietal muscles somewhat feeble, with a few, sometimes rather thick 

 folds. The parietal muscles are considerably expanded on the column. 

 Colour: in alcohol: Scapus ochreous-yellow or dirtily-yellow. 



Dimensions in contracted state: length to about 1,5 cm, breadth to about 0,5 cm. 

 Occurrence: East-Greenland. Fame Isl. Scoresby Sound 70°5o' N. 22°33' W. 5—8 m mud (Sw. 

 Greenl.-Exp. 1899, N. 31, 2 sp.). 



East Spitzbergen King Charies I^and. Jena Isl. at N.E. Cape about half a league 

 from land, in front of a great glacier. Coarse-grained, blue clay with a few, small 

 stones. 36 m (Roemer & Schaudinn 1898, St. 31, i sp.). 

 West-Spitzbergen, Ice-fiord, Temple bay, 43 — 45 m. Compact, greyish-red clay. 



9 



The Ingolf-Expeditimi. V. 9. 



