ACTINIARIA 



209 



the inner tentacles about 2 cm, the outer not half as long as the inner. The smallest specimen (with only 62 

 tentacles) is about 2 cm high and 4 cm broad at the pedal disc. 



Occurrence: Norway. FinmarkAndenesioo — 200 fms. (H. Kieri894) isp.,Drondtheim fiord, Garten 



25om(i9io)isp., R0dberg2Oom2sp.,Tautra25o — 8om2sp.(i)Gunnerusoi92i). 



62°i8' N. 4°i4' E. 370 m (Michael Sars-Exp. 1902 St. 60) i sp. 



62°54' N. 9°i3' W. 460 m. Bottom temp. 4,37° (Michael Sars-Exp. 1902 St. loi) 2 sp. 



15 miles E. of the northernmost Faroe Islands (taken with a line) (Michael Sars-Exp. 

 24. 7. 1900?) I sp. 



S. of Iceland 63°i5' N. 22°23' W. 326 — 216 m (Thor-Exp. 1903 St. 171) i sp. 

 Exterior aspect. The wide pedal disc is somewhat broader than the column. The body is, in 

 comparison to the breadth, low and forms a short cylinder. The column is smooth, firm and thick, sometimes 

 with indistinct furrows, probably arisen by contraction. The margin is tentaculate without a fossa. The ten- 

 tacles are thick, robust and conical, in contracted state longitudinally and transversally wrinkled, the inner are 

 more than twice as long as the outer and in preserved specimens about half as long as the height of the column. 

 They are not swollen at the base and rather scattered, so that they occupy about one half of the oral disc. 

 The number varies between 62 in the smallest specimen and 103 in the largest. Five examined specimens 

 had 62, 86, 90, 96, 103 tentacles, arranged in several cycles. In four of the specimens the tentacles were wholly 

 visible, in the smallest specimen and in one of the largest the tentacles were partly covered by the column. 

 It is, however, questionable, if the tentacles may be totally covered, as the sphincter is weak, in comparison 

 to the size of the animals. The inner, tentacle-lacking part of the oral disc is provided with radial furrows. 

 Both siphonoglyphes are broad and deep and aborally a little prolongated. The actinopharynx is long and 

 provided with numerous longitudinal furrows. 



Anatomical description: The ectoderm of the column was for the greater part lost. It is thin 

 and contains nematocysts, 17 — 22x1,5// in size. I have here, besides, found some nematocysts of the same 

 size as those of the tentacles, but it is possible that they are fastened to the surface and thus not belonging 

 to the column. The mesogloea, especially in some specimens, reaches a considerable thickness and shows a 

 fibrillar structure with scattered, rather numerous, small cells. The sphincter is rather weak and somewhat 

 elongated, but thin and only occupying part of the mesogloea. It was in two examined specimens, in all places 

 reticular with small meshes, in the specimen from Andenes and from Station 60 the outer parts bore traces 

 of stratification; the inner reticular part is separated from the outer by a lo:igitudinal, rather thick mesogloeal 

 lamella. The ectoderm of the tentacles is rather high, though not as thick as the mesogloea, and contains 

 very numerous nematocysts. The size of the nematocysts and spirocysts was in the different specimens as 

 follows, a) typical nematocysts, b) nematocysts with discernible basal part to the spiral thread. 



The logolf-Expedition. V. 9. 



27 



