144 



ACTINIARIA 



without tendency to become somewhat circumscript, with close, high folds. Circular endodermal muscles 

 of the column comparatively strong. Tentacles extraordinarily numerous, closely packed together, covering 

 the greater part of the oral disc, short, longitudinally sulcated, conical to cylindrical and in the latter case 

 rounded in the apex, all of about equal length. Well-developed aboral prolongations of the siphonoglyphes. 

 Mesenteries of large specimens extraordinarily numerous. Perfect mesenteries, in comparison to the number 

 of mesenteries, probably few. Oral stomata present; marginal stomata? Pennons of the mesenteries broad 

 with palisade-shaped folds. Basilar muscles well-developed, fan-like expanded. Nematocysts in the ectoderm 

 of the column, tentacles, and actinopharynx very numerous, those of the column 19 — 24 (28) X 1,5 — 2 /i, 

 those of the tentacles 30 — 60 X (2) 2,5 fi in the apex and (19) 22 — 36 X 2 — 3 // in the proximal part, and 

 those of the actinopharynx 31 — 47 (52) X 2,5^ — 3,5 //. Spirocysts in the extoderm of the tentacles numerous, 

 from 22 X 1,5 // to 55 (60) X about 5 /i. 



Colour of the column and tentacles neafly uniform, bright redlead-coloured or orange-scarlet, 

 niouthfolds a deeper shade of the same colour (Verrill). The tentacles of the Ingolf-specimens are dark 

 reddish-brown in the distal parts. 



Dimensions in preserved state: Oral disc unto 16 cm, length of the column unto 6 cm, breadth 

 of the basal disc unto 9 cm, length of the tentacles to about 4,5 cm. 



Occurrence: Davis Strait: 65°34' N. 54°3i' W. 68 fms. Bottom temp. 0,2 (Ingolf-Exp., St. 29), 

 66°35' N. 56''38' W. 318 fms. Bottom temp. 3,9° (Ingolf-Exp., St. 32), 68°2o' 

 N. 54°03' W. 228—280 fms. (Tjalfe-Exp. 1908). 

 In the neighbourhood of Bear Island 74°25' N. i7°36' E. 180 m (Olga-Exp., St. 49). 

 Between Bear Island and Spitzbergen 75°4o'N. i7°io' E. 190 — 200 m (Olga- 

 Exp., St. 55), 75°3i' N. i7°5o' E. 225 m. Bottom temp. i°6 (Norw. North. -Atl.- 

 Exp., St. 326). 6i°i5' N. 9°35' W. 872 m (Thor-Exp., 1904, St. 99). 

 Behring Island, 75 fms. (Vega-Exp.). 

 Further distribution: North-America. Cape Cod 45 fms. (U.S. Fish Com.) 47°4o' N. 47°35'3o" 

 W. 206 fms. (U. S. Fish Com.) (teste Verrill). 



A description of this species was given by myself 1902. The following table shows the size in // of 

 the nematocysts and the spirocysts in some specimens. 



Habitat 



column 



tentacles : apex. 



sp. 



tentacles: proximal 



sp. 



actinopharynx 



Behring Isl 



Davis Str. (Ingolf) . . 



— (Tjalfe) . 



Olga Exp 



19 — 24x1,5 — 2 

 19 — 24x1,5 



38 — 60x2,5 

 34—50x2,5 

 30—53 X 2—2,5 

 52-60 



29x1,5—55x4(5) 

 22x1,5—45x2,5 



24— 31(39) X 2,5(3) 



19 36 X 2-2,5 



24—31 X 2-2,5 



26x2 X 43x5(6) 

 24x1,5-43x5 



37—47x3 —3.5 

 31—41x2.5—3,5 



24—28 

 The size of the stinging capsules in the specimen from the Olga-Expedition is oiJy approximate 



40—52 



In addition to these species tentacles of a Bolocera species were taken during the Ingolf-Fxpedition 

 at the stations 37 and 38 (6o°i7' N. 54°05' W. 1715 fms. Bottom temp. i°4, 59°i2'N. 5i°05' W. 1870 fms. 

 Bottom temp. i°4). The nematocysts were considerably longer here than in very large specimens of B.tuediae. 



