150 



ACTINIARIA 



in Ulfsfiord, littoral (1861), Grotsund littoral (1861), Tromso 

 littoral (Kier 1902, Dons 1910, 3 m, Dons 1912), Gibostad 

 3 m (Dons 1912), Sorvaer (Ohlin 1890). 

 Kola peninsula: The Russian biological Station, Kolafiord (Derjugin 1906), I,adi- 

 gano, Cliewanna 30 fms. (Sandeberg 1877), Vaideguba littoral 

 (Sandeberg 1877), Semiostrowa 50 — 55 fms. (Sandeberg 1877), 

 lyitsa (Sandeberg 1876), Scharetskaja (lyilljeborg 1848). 

 Kara Sea: Jugor Shorr off Chabarova 5 — 8 fms. (Vega-Exp.). 

 Arctic Sea of Sibiria : 20' off Cape Jakan 12 fms. (Vega-Exp.), 2 miles north of the 

 winterharbourof the Vega 67°4'4g"N. I73°23'2" W. (Vega-Exp.), 

 Behring sound 67°4' N. I73°24'6" W. 7 — 9 fms. (Vega-Exp.). 

 Further distribution. North America. Arctic ocean to Cape Cod (teste Parker). Cape Elisa- 

 beth Me., Eastport Me., Grand Menan N. B.in crevices of rocks near low-water mark, Cumberland Bay (teste 

 Verrill), Passamaqvoddy Bay St. Andrews on rocks (teste Mc. Murrich). From Maine to Greenland (teste 

 Verrill). 



The anatomy of this species has been described before by Mc. Murrich (1910), wherefore I find 

 a recapitulation unnecessary, but will add some supplementary remarks to his description. 



The longitudinal muscles of the tentacles are ectodermal and resemble those of C. spetsbergensis, 

 described below, the muscle folds however show no tendency here to be mesogloeal. The radial muscles of 

 the oral disc are a little weaker and ectodermal (verified on several specimens). In 8 specimens collected 

 from different locahties, among others from Eastport, I have more closely examined the sphincter. In all 

 specimens it was of a palmate type. In no case the secondary lamellae issue from any distinct main lamella 

 — in a specimen from Frederikshaab there is, however, an indication of a main lamella. Now the sphincter 

 was more broad with distinct palmate extension of the lamellae, now it was more narrow and composed of 

 several very thin main lamellae. Mc. Murrich' s figure (1910 PI. 3 fig. 7) of the sphincter probably is not 



typical as it shows a pinnate appearance with a thick main lamella. In the 

 textfigure 159 I have reproduced the sphincter of a specimen from 

 Wales point. 



The verrucae were commonly distinct, in some specimens (from 

 Discofiord, Porsangerfiord and North Cape) indistinct, owing to a bad state 

 of preservation or to a strong contraction of the column. 



The number of mesenteries variates from 24 to 48 pairs, that of the 

 tentacles in the specimens examined by myself from 40 — 48. The mesente- 

 ries thus are more numerous than the tentacles. The mesenteries of the 

 last cycle are developed in the proximal part of the body and grow from 

 here in oral direction, but do not reach the distal end of the column. 



^ "If . ^' ^^f' In order to show the constancy of the size of the nematocysts, I 



Cnbnna stella. 



Transverse section of sphincter. give here the following table. 



