ACTINIARIA 



141 



Bolocera longicornis n. sp., Carlgren 1891, p. 241, 1893, p. 50, PI. i, fig. 18, PI. 6, figs. 3 — 6, PI. 7. Walton 

 1908, p. 216. Stephenson 1918 b, PI. 20, fig. 7. 

 Diagnosis: Body cylindrical, in expanded state considerably longer than it is broad. Spliincter 

 diffuse, of about the same appearance as in Bolocera muUicornis. Circular muscles in the endoderm of the 

 column rather strong. Tentacles conical, in expanded state very long (in regenerating specimens short?), 

 but strongly contractile, with deep longitudinal furrows, covering about half the oral disc, numerous, ar- 

 ranged in 5 or 6 cycles, the outer tentacles about half as long as the inner ones. Longitudinal muscles of the 

 tentacles and radial muscles of the oral disc well-developed with close, rather high folds. Aboral prolonga- 

 tions of the siphonoglyphes long. All or almost all mesenteries perfect in 4 or 5 cycles. Oral and marginal 

 stomata present. Longitudinal and basilar muscles about as in B. muUicornis, parieto-basUar muscles half 

 as long as the column, weak but distinct. Reproductive organs on most mesenteries except the directives 

 and some others of the first (second) cycle ? Nematocysts in the ectoderm of the column variable, partly 

 14 — 19 X 1,5 «, partly 26 — 48 X about 2.5 — 3,5 //, those in the apex of the tentacles in smaller specimens 

 60 — 82 X 2,5 — 3 fjL, in larger 70 — 127 X 3 — 3,5 /i, those in the proximal part of the tentacles in smaller spec- 

 imens 36 — 60 X 2,5 — 3 n, in larger 53 — 72 (86) X 2,5 — 3 n, those of the actinopharynx (38) 43 — 62 X 3— 

 4 fi. Spirocysts in the ectoderm of the tentacles 22 X i — 2 ji to about yy X 4 — 5 //. 



Colour: Column varying from pale flesh-coloured and pink to dark red. Tentacles and oral disc 

 generally correspond in colour with the column but are of a deeper tint, on the inside often reddish brown, 

 in which case also the oral disc is of the same colour but of a fainter shade. Gonidial tubercles and mesen- 

 teries sometimes carmine. 



Dimensions: Length in expanded state unto 20 cm, in preserved state about half as long. In con- 

 tracted state the diameter of the disc is almost like the length of the column. Inner tentacles about the length 

 of the column in expanded state. 



Occurrence: The Sound, Oretvisten about 40 m ("Sven Nilsson") i sp. 



Sweden. Gullmarfiord 40 — 80 fms. (Carlgren and others), Vaderoame (Goes). 

 Skagerrak, 370 fms, 320 — 380 fms (Gunhild-Exp., St. 10, 5, 6). 120 fms (Petersen 

 1887), 244—338 m (Thor-Exp. 1904, St. 312), (Thor-Exp. 1906, St. 11), 

 (Thor-Exp. 1911, St. 6), i5'/o miles NV2W. of Skagen's Ughtship 140 m 

 (Thor-Exp. 1904), 16V2 miles SW. to W. of Skagen's Ughtship 106 fms 

 (Petersen), NW. to W. of Hanstholm (Pommerania-Exp. , teste 

 Schulze). 

 Norway, Christianiafiord Konglungen about 10 m (Christiania mus.), Drobak (Carl- 

 gren, Christiania mus.), Hardangerfiord, Jonanes, Saetveitnes, Thorsnes, 

 Ljonestangen, Straumastein 100 — 400 m (teste Grieg), Herlofiord 150 fms 

 (teste Appellof), Korsnes 337 fms (teste Schulze), Vaagsfiord 120 fms 

 (teste Grieg), Sulenfiord 430 m. Temp, at 400 m 7°22 (M. Sars exp. 1902, 

 St. 32), Drontheimfiord (Biol, stat.), Malangen fiord 380 m. Bottom temp. 

 4°i, Stonesbottn 40 — 80 m (Nordgaard), Lyngo (Kier). 



