38 0. NORDGAARD. [2nd arc. exp. fram 



Sub-order. Ctenostomata. 



Gen. Alcyonidium, Latnouroux. 



75. Alcyonidium, mytili, Dalyell. 



July 12, 1901, bay at Land's End, little colony on a seaweed. 



Among the specimens from the 2nd Fram Expedition, there was 

 only one small colony; but this is sufficient to extend the already con- 

 siderable area of distribution of this species. 



The zocecia were about 0.6 mm. in length, and about 0.26 broad. 

 In a colony from the coast outside Bergen, the corresponding measure- 

 ments were found to be from 0.65 to 0.78 mm., and about 0.39 mm. 

 The species lias so large a distribution, that it may almost be said to 

 be cosmopolitan. It has been found in Spitsbergen and King Carl's 

 Land (K. A. Andersson), Jan Mayen (Lorenz), the Norwegian coast, 

 Denmark (Levinsen), the Baltic (Mobius), the P'rench side of the Channel 

 (Barois), the Mediterranean and the Adriatic (Calvet, Waters), Australia, 

 Port Philip, (Kirkpatrick), south of Tierra del Fuego, Isle Navarin, 

 Puerto Toro (Calvet'), Alaska (Robertson). 



76. Alcyonidium mamillatum, Alder. 



July 9, 1901, between Ren Bay and Cape Land's End. 



On Buccinuni from the above locality, an Alcyonidium was found 

 which I believe is identical with mamillatwm. The latter has also 

 previously been found in arctic seas. It is given by Levinsen from the 

 Kara Sea, by Smitt from Spitsbergen and Novaja Semlja, by Lorenz, 

 from Jan Mayn by K. A. Andersson from EastGreenland, and by Vanhoffen 

 from West Greenland. It is also known from GuUmar Fjord, Bohuslen 

 (Smitt) and from Northumberland, deep water (Alder). 



In „Ofvers af Kgl. Vet. Akad. Forh.«, 1866 (p. 497), Smitt has 

 given mamillatum as a form of A. hirsutum; and?of the figures be- 

 longing to liirswtuin (PI. 12, figs. 3 — 8), only figs. 5 and 6 are given by 

 HiNCKs in Brit. Mar. Pol. as of the species mamillatum. 



As figs. 5 and 6 represent zooecia of a specimen from GuUmar 

 Fjord, while figs. 3 and 4 are of zooecia of a colony from Bell Sound, 

 Spitsbergen, this of itself indicates a difference between the arctic and 

 the boreal specimens of the species; but whether the difference is suf- 

 ficiently great to allow of a systematic separation, I am at present un- 

 able to decide. In the specimen that I found among those from the 

 2nd Fram Expedition, the young zooecia showed a great resemblance to 



' Hamburger Magalhaensisclie Sammelreise. Bryozoen, p. 38. Hamburg 1904. 



