ACTINIARIA 



Among Danielssen's figures of the species only the figures I, 2, 3, 5 and 13 (PI. 20) are usable, but nowise 

 good, the others are very bad. The section reproduced in the figure 7 has in the centre not hit the actinopha- 

 rynx, but the involved part of the column; the figures 10 and n show nothing as to the presence of acontia 

 and testes. As already corrected by Appellof (1893 p. 18) this species has normally developed directive me- 

 senteries. 



The above description of the species is based not only on a type-specimen but also on several individ- 

 uals from different localities. 



Edwardsia islandica n. sp. 



Diagnosis. Physa rather well-developed. Scapus with a very strong cuticle and with rather few, 

 scattered, small nemathybomes. Nematocysts of the nemathybomes 36 48 x 2 2.5 JH. Tentacles 16. 

 The nematocysts of the tentacles about 22 24 X 1.5 ft, their spirocysts 12 17 X 2 2.5/M? The nemato- 

 cysts of the actinopharynx (33) 36 43 X 2 ft. Longitudinal muscle pennons of the mesenteries somewhat 

 strong with a few (to about 12) folds which are of about equal height and rather richly branched. Lamellar 

 outer part of the mesenteries in the upper part of the reproductive region attached to the pennons not far from 

 the outside of these latter. Parietal muscles, especially in comparison with the pennons, very strong, mostly 

 trianguloid and with numerous folds. The expansion of the parietal muscles on the column is considerable. 



Colour? 



Dimensions: Breadth of the column 0.4 cm. As to the length I cannot give any exact information, 

 the single specimen, dredged at the same time as E. tuberculata having been sectioned, and the thickness 

 of the sections not having been stated. 



Occurrence: South of Iceland 63i5' N. 2223' W. 326 216 m (Thor-Exp.) i sp. 



Exterior aspect: The physa is rather well-developed. The scapus is provided with a very strong 

 cuticle and with rather few, small, scattered nemathybomes. The capitulum is polygonal. Number of ten- 

 tacles 16. The actinopharynx is strongly folded. I cannot decide whether a siphonoglyphe is present or not, the 

 ectoderm of the actinopharynx not being well preserved. 



Anatomical description: The ectoderm of the physa was considerably higher than that of the 

 scapus. The scapus-ectoderm is provided with a thick cuticle which in several places may become as thick 

 as the ectoderm. The cuticle very much recalls that of Isoedwardsia ingolfi, though it is not quite as thick. 

 It is strongly folded because of the strong contraction of the scapus. The small nemathybomes only contain 

 a single kind of capsules 36 48 x 2 2.5 /i in size. The ectoderm of the capitulum is higher than that of the 

 scapus. The nematocysts and spirocysts of the tentacles and the nematocysts of the actinopharynx I have 

 only been able to measure in sections. The nematocysts of the tentacles are about 22 24 X 1.5 //, the spiro- 

 cysts about 12 17 X 2.5 ft; the latter measures are, however, very uncertain. The numerous nematocysts 

 of the actinopharynx were (33) 36 43x2/7. The nematocysts of the tentacles and of the actinopharynx 

 are measured on sections. 



The 8 "Edwardsia" -mesenteries are rather strong with some few (to about 12) folds which are of 

 about equal height and show a tendency to rich ramification (textfig. 46). The small, imperfect mesenteries 

 of the uppermost part of the column are thick. The parietal muscles, especially when compared with the 



