1898-1902. No. 8.] BRYOZOA. 39 



Smitt's fig. 3 on pi. 12. The semicircular thickening that recalls the 

 operculum in Cheilostomata was present. In a colony from Bell Sound, 

 SiiiTT found the length of the zooecia to vary between 0.7 and 0.85 mm. 

 In the specimen from the 2nd Fram Expedition, the length of the zooecia 

 was from 0.9 to 1.17 mm., and their breadth from 0.39 to 0.52 mm. I 

 am most inclined to regard Alcyonidium inamillatuin as an originally 

 arctic species, which, in the most southerly of the places where it is 

 found, is a relict form the Glacial Period, and has thus become some- 

 what dwarfed in those localities. 



77. Bowerbankia, imbricata, Adams. 



July 19, 1901, the lower part of Gaase Fjord. 



On Bugula murrayana, var. fruticosa from the above locality, 

 there were found creeping colonies of a Bowerbankia which I have 

 identified with imhricata. Among the Bryozoa collected by Captain 

 H. W. Feilden in the North Polar Expedition, Busk^ found only one 

 ctenostomatous species, which occurred on Bugula fruticosa. He de- 

 scribes it as follows: „Zo(Ecia in opposite pairs at very distant intervals 

 on a slender tubular stem." And he adds: „In case it be new, it might 

 be termed Farella, or, if with a gizzard, perhaps Bowerbankia ardica" 

 The specimen mentioned was in such a bad condition that no more 

 minute examination could be made. Since that time, no arctic Farella 

 has been found, and the name Farella ardica ought for the present 

 to be put aside. Vanhoffen^, on the other hand, found a form in 

 the Karajak Fjord in Greenland, which he names Bowerbankia ardica, 

 Busk. This name would indeed be right if the form found by Vanhof, 

 FEN were specifically different from imbricata; but it is most probable 

 that it was imbricata that occurred in the Karajak Fjord; for Hincks 

 mentions the species from the White Sea and Queen Charlotte Islands- 

 and Alice Robertson from Alaska, thus giving imbricata an arctic 

 distribution. Nor could I find any systematic difference between speci- 

 mens from the Bergen coast and the colonies from the lower end of 

 Gaase Fjord. The first-named have as a rule free colonies, in which 

 the zooecia are gathered into small groups, while the arctic were creep- 

 ing. The arctic specimens also seem to have larger zooecia (up to 1.3 mm.); 



Joum. Linn. Soc, vol. 15, p. 240, pi. 13, fig- 9- . 



Die Fauna u. Flora Gronlands. GrOnland-Expedition der Gesellschaft fur Erd- 



kunde zu Berlin. 1891-1893, vol. II, p. 234. 



