ACTINIARIA Ar . 

 49 



Edwardsia vitrea (Dan.) Carlgr. 



PI. i, Figs. 5, ii. 

 Edwardsioides vitrea n. sp. Danielssen 1890, p. 100, PI. 5, fig. 3, PI. 16, figs. 4 10. 



Diagnosis: Physa rather well-developed. Scapus with a very thin periderm, with scattered nemathy- 

 bomes, the nematocysts of which are (34) 3642 X 33-5 p- Number of tentacles 1316. Nematocysts 

 of the tentacles 17 29 X 2.5 3.5 //, the spirocysts unto 29 X 2.5 3.5 //. Nematocysts of the actinopha- 

 rynx very numerous, partly (31) 3653 x 2.53.5 H, partly 1724 X 2.5 p. Longitudinal muscle pennon 

 strong, in the upper part of the reproductive region with 20 30 longer and shorter folds, the former with 

 numerous, small secondary folds. The outer lamellar part of the mesenteries attached close by the outside 

 of the pennon. Parietal muscles very strong, in transverse-sections through the reproductive tract often 

 trianguloid, with very numerous, long, closely packed folds. The expansion of the parietal muscles on the 

 column the ordinary one. 



Colour: Periderm greenish, transparent. The integument inside almost as clear as glass, with a 

 faint play of reddish colour and with pale light-red longitudinal furrows. In fully expanded state the capi- 

 tulum has a faint, rose-red tinge, and so has the physa. Tentacles beautifully bright-red (Danielssen). 

 Scapus in preserved state dirty-grey or partly ferruginous. 



Dimensions in extended state: 4 5 cm in length and 0.8 cm in breadth (Danielssen). In con- 

 tracted state the length is to about 3 cm and the breadth to about 0.7 cm. 



Occurrence: East-Greenland Franz Joseph Fiord 73i6' N. 23is' W. 28 36 m clay with stones 



sand and shells (Sw. Greenland-Exp. 1899 No. 44) 2 sp. 



Spitzbergen Wijde bay 40 fms. (Sw. Spitzberg-Exp. 1861) i sp. Great fiord 7837' N. 

 19 E. 510 fms. Sand (Malmgren 1864) 3 sp. Great Islet 8oi5' N. 

 30 E. 95 m (Romer and Schaudinn St. 37) i sp. 



682i' N. io4o' E. 836 m clay and sand. Bottom temp. 0.7 (Norw. N. Atl.-Exp. 

 St. 164) i sp. 



Exterior aspect: The physa seems to be smaller than in the former, species described. Accord- 

 ing to Danielssen it is incapable of involution; this is probably not correct. In the examined type-specimen 

 (fig. 5, PI. i) the scapus is separated from the physa by an annular lacing in. Danielssen also states that 

 the physa is provided with sparse suckers (nemathybomes?). This is certainly not the case, I never observed 

 any such. On the other hand foreign bodies sometimes seem to be attached to the physa ; in the type-spec- 

 imen there were namely fragments of such adhered to the physa, probably by the secretion of the mucus-cells. 

 According to my examination of the species from Great Islet, the physa of which I have sectioned, the physa is 

 perforated by apertures. The scapus is provided with 8 longitudinal furrows, corresponding to the insertions 

 of the mesenteries, and with scattered, rather numerous nemathybomes. Danielssen declares that the suck- 

 ers (nemathybomes) are arranged in somewhat regular transversal rows which, however, does not seem 

 to be case. The periderm of the scapus is very thin. When the animal is very much expanded the periderm 

 is almost inconspicuous (Danielssen). The involved part of the scapus is a little polygonal. The capitulum 

 is short and provided with distinct, longitudinal furrows, corresponding to the insertions of the mesenteries. 



The Infolf-Expcdition. V. 9. 7 



