NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 77 



laria, and small lateral ones rarely on colonies with the large median 

 type, but as a rule only one type of avicularium is present in any one 

 colony. 



The ovicell is prominent, hemispherical, about 0.40 mm wide, hyper- 

 stomial, the aperture wide and covered by a special membrane ; the ecto- 

 oecial wall smooth and shining, with a slightly elevated collar around 

 the ooecial aperture when complete. 



Originally known from Spitsbergen, its range has been extended 

 (Osburn 1919, 1923) to west Greenland and Hudson Strait, and from 

 Icy Cape, Alaska. 



Punuk Island, Bering Sea, 15 fms on shells. Prof. G. E. MacGinitie 

 has recently collected it also at Point Barrow, Alaska, 18 to 25 fms, 

 common. 



^ ",/ Bidenkapia spitsbergensis van alaskensis new variety 



Plate 8, fig. 7 



This variety, partially discussed above, occurs with the typical va- 

 riety, along the coast of northwestern Alaska. Since some colonies present 

 only the smaller avicularia, it seems advisable to give it a varietal name. 

 The difference was first noted by Osburn (1923:8D), in a specimen 

 from Icy Cape, Alaska (Canadian Arctic Expedition Sta. 23). "In this 

 one small specimen the zooecia are smaller, the avicularia are smaller, 

 and there are sometimes two of them at the distal corners of the zooecium 

 and faced toward each other. The ooecium and the zooecial characters 

 are similar to those of spitsbergensis and the dorsal wall is similarly 

 perforated." 



Type, AHF no. 19. 



A number of colonies, with those of the typical form at Point Bar- 

 row, Alaska, 23 fms, G. E. MacGinitie, Arctic Research Laboratory. 



Genus TEGELLA Levinsen, 1909 



"The zooecia, which have spines and a slightly developed cryptocyst, 

 are provided with multiporous rosette plates. Hyperstomial ooecia with 

 an incompletely calcified ectooecium, which are again surrounded by an 

 avicularium." (Levinsen). The most important generic character is the 

 absence of pore chambers, which separates the species of this genus from 

 Call op or a. 



Levinsen's statement concerning the ovicell is not quite clear; the 

 ectooecium usually does not fully cover the entooecium, but it is usually 

 heavily calcified; the avicularian chamber may cover the distal end of 



