ACTINIARIA 



sen also says that the border of the pedal disc is undulated. The column is low or high according to the more 

 or less contracted state of the body (the specimens from Sunde were both cylindrical and very much con- 

 tracted). In the reproduced specimen (PI. i fig. 17) distinct, longitudinal furrows appear on the column; 

 on the distal part one can see small, papilliform elevations of the same appearance as on the proximal 

 parts of the tentacles, but these elevations are much more indistinct here than there, and sometimes not 

 visible at all. 



The tentacles are of ordinary length, but broad. Their form is conical, in the apex they are hemi- 

 spherical and smooth, while the larger, proximal part bears small, papilliform elevations, very closely 

 packed; in the extended, reproduced specimen and in the type specimen (PI. i. fig. 19) they are very distinct. 

 On the other, very contracted specimen from Sunde these elevations are not visible, neither on the tentacles 

 nor on the oral disc or the column. The inner tentacles are considerably longer and broader than the outer 

 ones. The reproduced specimen had 24 tentacles (6 6 12), the other specimen from Sunde 28. Besides 

 the 24 tentacles arranged in the usual manner there are on each side of the directive plane 2 tentacles de- 

 veloped in the transversal plane (in the primary, lateral exocoels). Danielssen declares that his specimen 

 is provided with 32 tentacles, octomerously arranged. That is, however, not so, in fact there are 38 tentacles 

 developed. On one side 18 tentacles namely appear, on the other 20. It is difficult to find out how the ten- 

 tacles really are arranged, because of the bad preservation of the type specimen. I think, however, that on 

 basis of my notes I can make the conclusion that the richer development of tentacles takes place mainly 

 in the transversal plane. It is also possible that after the stadium of 24 tentacles another arrangement of 

 the tentacles appears; I am really more inclined to think that in the type specimen the arrangement is de- 

 camerous instead of octomerous. Perhaps this arrangement is only temporary, so that the animal after having 

 reached the stadium of 48 tentacles (if it obtains so many) rearranges the tentacles hexamerously. Concern- 

 ing the mesenteries I have observed such a rearrangement to take place in Condylactis georgiana (Carlgren 

 1898 p. u, 12). 



The oral disc is on the extended specimen conical, with the more or less split-like mouth in the apex 

 of the cone (PI. i, fig. 18). It is wide and furnished with radial furrows extending into the actinopharynx, 

 whereby the margin of the mouth becomes of an indistinctly crenellated appearance. On the oral disc we 

 find the same papilliform elevations as on the tentacles, though they are smaller and more indistinct. The 

 actinopharynx is longitudinally sulcated. Danielssen declares that there are 8 furrows, on the specimens 

 from Sunde there are about 14. The furrows in the directive plane differ in no respect from the others. 



Anatomical description. Only the distal part of the original specimen remained after the ex- 

 amination by Danielssen, and even of this a large piece was not well preserved. For the anatomical ex- 

 amination I have cut out a piece with 4 tentacles. Furthermore I have sectionised the best conserved spec- 

 imen from Sunde, mostly transversally. 



The pedal disc possesses, judging from the specimen from Sunde, a thick ectoderm containing nu- 

 merous mucus-cells. Whether spirocysts occur also here I cannot decide, as maceration-preparations do not 

 give any positive result, because of the unfavourable conservation and the sticking of the filaments to the 

 pedal disc. On the other hand I have in sections found nematocysts agreeing with both smaller kinds of 



