76 



ACTINIARIA 



siou of the parietal muscles on the column is considerable. Several marginal stomata. Ciliated streaks dis- 

 continuous. 



Colour: opaque white to yellowish- white with dirtily-yellow reproductive organs and filaments. 

 In the distal part of a contracted specimen I obser\'ed brownish spots, discernible from the surface. Probably 

 they belong to the uppermost part of the colunm or to the oral disc. 



Dimensions: Two specimens from GuUmar fiord were 2,7 resp. 2 cm in length, and 0,2 in breadth. 

 The length of the specimen from Kal fiord was 1,3 cm, its largest breadth 0,3 cm. 



Occurrence: Sweden. Bohuslan. Gullmar fiord, Skar, lyindholm, between L,ysekil and Kristine- 



berg 30 — 70 fms. clay (Carlgren 1893) 5 sp. 

 Norway. Finmark. Kal fiord 80 m. clay (Goes and Malmgren 1861). 



Exterior aspect: The body (PI. i, figs. 13, 14) is elongated and quite smooth, without a cuticle 

 and provided with shallow, though distinct, longitudinal furrows corresponding to the insertions of the 

 mesenteries. It is not divisible into regions. The proximal part is ampullaceous or pointed, according to the 

 state of contraction. In the centre of this part there is an aperture surrounded by a cycle of apertures arranged 

 as those oi Halcampa (Carlgren 1893, textfig. 7). In one examined specimen the cjxle contains 8 apertures, 

 one in each " Edwardsia-compsLttment." It is possible that the number of apertures is 10, if 10 mesenteries 

 are perfect. As far as I can see there are no tentacles. The animals having been dredged in deep water were not in 

 full vigour in the aquaria. I have, therefore, only once observed a wholly expanded specimen. In this one 

 I was not able to find any tentacles. Two other specimens were examined under strong magnifying power 

 with the same results. I at first supposed that the tentacles were invaginated, as it is often the case in Hal- 

 campoides, or that they had been thrown off as in Bolocera, but soon discovered that there was notliing in 

 the organization to support that supposition. The study of two serial sections, of which one is complete, 

 likewise proved that there are no tentacles. The structure of the oral disc also indicates that the distal end 

 of the animal is transformed. The oral disc is namely very much thickened and forms a high wall, provided with 

 radial furrows, corresponding to the insertions of the mesenteries. The actinopharynx is short, in comparison 

 with the length of the body. It is devoid of siphonoglyphes, gonidial tubercles and aboral prolongations. 



Anatomical description: For anatomical examination I have sectioned series of two whole 

 specimens. Of two others one has been transversely sectioned in the proximal part, the other one in the 

 distal part. The specimen from Kal fiord I have sectioned longitudinally in the distal part, transversely in 

 the tract of the actinophar>'nx and below the actinopharynx. 



The wall of apertures in the proximal body-end is in structure similar to that of the Halcampa (Carl- 

 gren 1893 a). The three layers of the column are all of about the same thickness; in the distal part the ecto- 

 derm is, however, thicker than the other layers. In the ectoderm of the column the two common types of 

 stinging capsules are found, in addition to large homogeneous, and smaller granulate gland-cells. The nema- 

 tocysts are in the proximal part rather numerous and about 14 — 18 // long, in the distal part a little more 

 sparse and shorter (11 — 14 n) ; the spirocysts, on the other hand, reaching to a length of about 16 — 20 ii are 

 numerous in the distal part, in the proximal part very sparse, only here and there appearing. In the ecto- 

 derm of the column I have besides found somewhat larger nematocysts (24 x 4 //), sometimes with a distinct 



