NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 683 



Ovicell large, curved forward, usually replacing the second zooecium 

 of an internode; the ooeciostome curved forward, widest at its base, the 

 pore transversely elliptical and the proximal margin somewhat inflected. 



This is a very common species on the coasts of Europe and North 

 America (Atlantic coast) and entering the Arctic Ocean, common in 

 Greenland waters. Recorded for Icy Cape and Point Barrow, Alaska 

 by Osburn, 1923 :5D. Hincks (1884:203) reported it from Virago 

 Sound, British Columbia, but this record appears to be questionable as 

 the species has not been recovered south of northern Alaska, and he may 

 well have confused it with C. Occident alis Trask, which has the same 

 growth form of incurved branches and is common in British Columbia 

 waters. 



Point Barrow, Alaska, 18 fms, Arctic Research Laboratory, G. E. 

 MacGinitie, collector. 



Grisia cribraria Stimpson, 1853 

 Plate 72, fig. 1 



Crisia cribraria Stimpson, 1853:18. 

 Crisia eburnea var. cribraria, Verrill, 1879:28. 

 Crisia eburnea var. cribraria, Whiteaves, 1901:110. 

 Crisia cribraria, Osburn, 1912:215; 1912a:276; 1933:8. 



The zoarium consists of nearly erect, straight and stiff flabellate 

 branches rising to a height of 20 to 25 mm. The internodes are long, 

 usually about 18 or 20 zooecia, the joints occasionally wanting. The 

 zooecia are almost completely fused, with only a very short peristome 

 which curves abruptly forward and slightly toward the axis of the 

 branch, a sharp projection often present on the outer border of the 

 aperture. 



The ovicells are large, elongate, the distal end prominently rounded 

 and more or less obscuring the ooeciostome from a frontal view. The 

 ooeciostome is short and broad, the aperture almost slit-like, the tip 

 somewhat flared outward. 



Stimpson described the species from Grand Manan Island, Maine, 

 and it is a fairly common species along the east coast of North America 

 as far south as Cape Cod. 



Point Barrow, Alaska, 7 fms, Arctic Research Laboratory, G. E. 

 MacGinitie, collector; two colonies in reproduction. 



