NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA — CYCLOSTOMATA 767 



The known range on the Pacific coast is from 33°42'30"N, southern 

 California, to Ecuador, Peru and Cape Horn. It appears to be a species 

 of shallow waters, though Busk described it from Tristan de Cunha 

 Island at a depth of 100-150 fms. 



Barentsia ramosa (Robertson), 1900 

 Plate 82, Figs. S and 6 



Gonypodaria ramosa Robertson, 1900:337. 

 Gonypodaria ramosa, O'Donoghue, 1923:6. 

 Barentsia ramosa, O'Donoghue, 1926:8. 



The stolon is creeping and adherent, becoming heavily chitinized and 

 brown, 0.07 mm in width. From this arise erect, jointed, and branched 

 sub-colonies, with 3 or 4 joints in series, and these usually give rise to 

 1 or 2 branches which in turn may develop secondary branches. The 

 internodes vary much in length, from 0.65 to 2.60 mm; in width they 

 measure 0.06 mm at the base and 0.10 to 0.13 mm near the tips. The 

 muscular nodes vary in length from 0.24 to 0.30 mm and in width from 

 0.15 to 0.20 mm. The basal bulb is short, 0.30 to 0.35 mm long by 0.20 

 to 0.26 mm wide. The calyx is short and wide, the height, excluding 

 the tentacles, 0.35 to 0.50 mm and the width 0.40 to 0.55 mm. Tentacle 

 number, 16-20. The total height of the tallest sub-colonies is about 5 mm. 



Conspicuous features of the internodes are the heavy chitinization of 

 the wall, the brownish color, and the conspicuous "pores," which are 

 larger than in B. discrete; also the sub-colonies appear to be more rigid 

 than in other members of the genus. 



The species was described by Robertson from Pacific Grove (Monte- 

 rey Bay), California, and recorded also from Fort Point and Land's 

 End, California and from Channel Rocks, Puget Sound. O'Donoghue 

 recorded it from several localities in British Columbia. 



Hancock Collections: Carmel Cove, south of Monterey Bay, Cali- 

 fornia, on the stems of the hydroid Garveia. It is a littoral species, but 

 O'Donoghue dredged it at 20 fms. 



Barentsia gorbunovi Kluge, 1946 



Plate 82, figs. 10-12 



Barentsia gorbunovi Kluge, 1946:153 and 157. 



This is a remarkable species growing in bushy form to a height of 5 

 cm or more. There is an adherent stolon, 0.10 to 0.20 mm in width, 

 from which arise very complex sub-colonies. At the bases of these there 

 are gigantic muscular bulbs of the usual shape, but with a height of 1.0 



