ACT1N1ARIA 



disc. The gonidial grooves yellowish-white. When the animal is placed in alcohol the fluid becomes bright 

 brownish-violet, and also the animal itself acquires a deep violet colour (Danielssen). 



Dimensions in preserved state unto 3,4 cm broad at the base; length of the column 2,5 cm, length 

 of the inner tentacles 0,8 cm, that of the outer ones 0,6 cm. Danielssen states the breadth to 4 cm. 



Occurrence: West Greenland. Baffin bay 7526' N. 6y2j'Vf. 250 fms. (Sofia-Exp.). Umanak 



250 fms. (1860). 

 East Greenland. 766' N. i326' W. 100 125 fms. (Danmark-Exp.) ; 7225' N. 



I756' W. 300 m (Sw. Polar-Exp. 1900). 

 Greenland without distinct locality. 

 Jan Mayen (Norw. N. Atlantic- Exp. 1877). 



Kara Sea. 72i9' N. 5554' E. 90 m (Due d' Orleans- Exp. 1907). 7334' N. 5756' E. 

 60 fms. (Nova-Zembla-Exp. 1875). 7338' N. 6345'E. (Nordenskiold's- 

 Exp. 1876). 



Exterior aspect: This species has been described by Danielssen before (1890), but in several 

 respects erroneously. The pedal disc is provided with a well developed cuticle and is enlarged, but it is sur- 

 passed in breadth by the oral disc, when the latter is expanded. The column is smooth, in contraction more 

 or less wrinkled, without distinctly marked longitudinal furrows, corresponding to the mesenteries. As the 

 animal is wholly extended the folds between the furrows disappear, wherefore the surface becomes smooth 

 (Danielssen). A specimen, reproduced in the figure 6 PI. 2, is provided with some irregular apertures in 

 the column. As far aslcan see, these apertures are no cinclides, as Danielssen has supposed, but artificial pro- 

 ducts, and probably apertures, remaining after the specimen's having been damaged and regenerated. In the other 

 specimens I have not found any apertures, which speaks for the opinion that they are not normal formations. 

 Besides, the column is rather thin (according to Danielssen, in extended state almost membraneous and 

 transparent) ; in the distal part it, however, reaches a considerable thickness, owing to the strong development 

 of the sphincter. No fossa is present. The tentacles are, as a rule, octomerously arranged in four cycles (8+8 

 + 16 + 32). The two inner cycles are, however, so close by one another that we can say that there are only 

 three cycles, as Danielssen states. In the type-specimen and in a specimen, taken during the "Danmark"- 

 Expedition, the number of tentacles was 64, in a third specimen there were 68 tentacles ; among these, four 

 tentacles were of a fifth cycle, developed close by the one pair of directives, in a fourth there were 80 ten- 

 tacles. In the last case there were 16 tentacles of a fifth cycle, in two octants, one of each side of the one pair 

 of directives. The inner tentacles were only a little longer than the outer, but much broader. The form of the 

 tentacles as usual conical, the outer tentacles were a little swollen on the outside at the base. All tentacles 

 were in contracted state provided with distinct longitudinal furrows and with a distinct aperture in the apex. 

 The oral disc was strongly excavated in the contracted state of the animal (fig. 6 PI. 2) and provided 

 with distinct radial furrows, corresponding to the insertions of the mesenteries. As the oral disc is wholly 

 extended, its diameter may be twice that of the pedal disc. 



The actinopharynx is short and provided with few (5 8) furrows and ridges on each side (Pi. 2 

 fig. 7). The two, symmetrically situated, siphonoglyphes are broader in the oral part than in the proximal 



