ACTINIARIA 



Dimensions: Length of the column 2,2 cm, largest breadth 1,2 cm. Length of the tentacles about 

 0,4 cm. 



Occurrence: Greenland. Nordre Stramfjord, 325 330 m. Temperature at the bottom 0,1 

 (Nordmann 1911 St. 3 a) i sp. 



Exterior aspect: The form of the body is the same as in the former species. The single spec- 

 imen was a little contracted, one part of the tentacles was however conspicuous. The column was a little 

 longitudinally wrinkled, the fossa was deep. The tentacles were 48, hexamerously arranged, as many as the 

 mesenteries, and all of about equal length, the inner, however, thicker, conical. Their surface was smooth or 

 indistinctly longitudinally sulcated. The oral disc was inconsiderable, the actinopharynx long with distinct 

 siphonoglyphes, having well developed gonidial tubercles, but no aboral prolongations. 



Anatomical description. The ectoderm of the column is rather high and contains numerous 

 nematocysts, finely-grained gland-cells and sparser mucus-cells. Concerning the size of the nematocysts 

 and spirocysts, compare above. I have not observed any cuticle, nor any of the spots on the column, which 

 are present in E. arctica. The mesogloea is thicker than the ectoderm, the endodermal circular muscles strong, 

 and recall those of the former species. The sphincter is palmate and much recalls the reproduced sphincter 

 of E. arctica but is devoid of a main lamella and, on account of the contraction, a little compressed. The 

 longitudinal muscles of the tentacles and the radial muscles of the oral disc agree with those of the former 

 species. 



The pairs of mesenteries are 48 in number (6 + 6 + 12). All the mesenteries of the third cycle were 

 of about the same size and had well-developed filaments and reproductive organs. All mesenteries are perfect. 

 The longitudinal pennons were somewhat broad, with rather high folds, all of about the same length. The 

 parieto basilar and basilar muscles are not different from those of E. arctiea. The specimen was a male, with 

 well developed reproductive organs. 



Systematic remarks. The species is distinguished from E. marsupialis and arctica by the consist- 

 ency of the column, and by all the mesenteries of the third cycle being equally developed. The tentacles are also 

 a little more numerous, and the size of the nematocysts of the column differing from that of E. arctica. As 

 the specimen was considerably smaller than the larger specimens of E. arctica and marsupialis, but nevertheless 

 had all the mesenteries of the third cycle equally developed and furnished with filaments and reproductive 

 organs, I think that it may be a particular species. It is most nearly allied to E. marsupialis. 



Epiactis incerta n. sp. 



Diagnosis: Column not elongated, without a cuticle and particularly differentiated spots. Fossa distinct. 

 Sphincter strong, palmate. Tentacles from conical to cylindrical, rather broad, smooth, 28 in number. Actino- 



dm dm 



pharynx sulcated with two siphonoglyphes. Pairs of mesenteries 14 (6+4+4; 13213211123123). Long- 

 itudinal muscle pennons very strong with high and concentrated folds. Parieto-basilar muscles very strong, 

 almost reaching the sphincter. Oral stomata and marginal stomata present. Dioecious. Nematocysts in the 

 ectoderm of the column 24 31 X 2 2,5 /;, in the tentacles 22 26 X 2 p (also smaller 15 17 X i,5//), 

 in the actinopharynx 36 46 x 3,5 4,5 p. Spirocysts of the tentacles 19 X 1,5 36 x 2 . 



