ACTINIARIA 



North Atlantic: 6o°57' N. 3°42' E. 350 m. Bottom temp. 6°i6 (M. Sars-Exp. 1902 

 St. 47), 6i°3' N. 2°i3' E., 130 m. Temp, at 125 m 6°7S (M. Sars- 

 Exp. 1902, St. 49), 6i°4' N. 3°ii' E. 400 m Bottom temp. 6°34 

 (M. Sars-Exp. 1902, St. 51), 59°35' N. 7°8' W. 585 fms (Ingegerd & Gla- 

 dan-Exp.), s'/siniles S.S.E.of Bispen.Faroe Isl.,5ofms(Mortensen). 

 S. of Iceland 49=38' N. ii°35' W. 923 m (M. Sars-Exp. 1910, St. 4). 

 West Greenland: Bredefiord 490 m (Rink-Exp. 1912, St. 49). 



Davis Strait 64°54' N. 55°io' W. 393 fms Bottom temp. 3°8 (Ingolf- 

 Exp. St. 27). 



Davis Strait 65°i4' N. 55°42' W. 420 fms Bottom temp. 3°5 (Ingolf- 

 Exp., St. 28). 

 Further distribution: North Sea. Coast of Great Britain and Ireland (teste Gosse, Stephenson 

 and others), Shetland Isl. (teste Norman), Atlantic coast of North-America, Nova Scotia 50 — 100 fms. 

 Gulf of Maine 50 — 150 fms, Casco bay 40 — 90 fms, Massachusetts bay 40 — 52 fms. Cape Cod 37 — 90 fms, 

 George's bank 306 fms, Martha's Vineyard 160 — 640 fms. Southern New England, Cape Fear 464 fms (teste 

 Verrill). 



In mj' paper (1893) I have left the question open, if Bolocera tuediae and B. longicornis are ident- 

 ical or not. It seems to me from the above list of synonyms that we have to do with a single species, though 

 the figures reproduced by Johnston and Gosse of B. tuediae, apparently the species with very strongly 

 contracted tentacles, do not agree with the common appearance of B. longicornis in contracted state (com- 

 pare Carlgren 1893). The tentacles of B. longicornis namely are capable of varying extraordinarily in length, 

 owing to their strong longitudinal muscles. In recently dredged, sound specimens the extended tentacles are very 

 long — the tentacles of the specimens living in the aqvarium of the biological station of Drontheim are of 

 the same appearance — while half dead specimens have very short tentacles but often strongly swollen at 

 the base (about as the figure reproduced by Gosse). Thus I think that the difference in length of the ten- 

 tacles in B. tuediae and longicornis is due to a different state of contraction. 



Another difference in the exterior of both species consists in the presence of columnar warts in B. tue- 

 diae, which are not observed in B. longicornis. Gosse not having seen the species alive namely says (i860, 

 p. 186) that B. tuediae "is studded, somewhat sparsely, with minute rounded warts, which are scarcely 

 apparent, when the animal is extended, but, on contraction, "resemble the heads of small pins in a pin- 

 cusliion "(W. P. Cocks)." The figure PI. 5 in the work of Gosse representing S.^Merfme, also shows scattered 

 warts on the column. That they are not real sucking warts is evident (compare also Stephenson, 1918b, 

 p. 113), it stiU remains to be explained of which kind the warts drawn by Cocks are. For that reason I have 

 examined the extended column of the specimen of B. longicornis from Ireland on stained surface prepara- 

 tions, as well as on sections. It then became clear that the ectoderm of the column is not homogeneous. Over 

 the surface there are namely scattered irregular spots containing numerous gland-cells and nematocysts, 

 which are very sparse in the intermediate parts of the ectoderm. Probably it is these spots (possibly the 

 intermediate parts) which Cocks has observed and which ought to appear more distinct when the column 



