NO. 1 OSBURN: EASTERN PACIFIC BRYOZOA CHEILOSTOMATA 167 



to 39 fms; 1385-41, off East Point, Santa Rosa Island, 75 to 76 fms, 

 southern California. Since the bathymetric range increases southward, 

 it seems probable that this is a species of moderately northern distribu- 

 tion and that southern California may be about the southern limit. 



'L% Dendrobeania laxa (Robertson), 1905 

 Plate 25, figs. 2 and 3 



Bugula laxa Robertson, 1905 :275. 



Bugula laxa, O'Donoghue, 1923 :21 ; 1925 :99 ; 1926 :45. 



This is a spreading, recumbent species, loosely attached by numerous 

 radicles. The fronds vary greatly in width from 2 or 3 zooecia to many, 

 and the intermediate variations appear to render the variety attenuata 

 O'Donoghue (1923:21) merely a nominal one. All of the species of 

 Dendrobeania that have come under our observation have this variability 

 in width. 



The zooecia are large, like those of the other species of the region, 

 about 0.75 to 0.90 mm in length, and are more loosely connected with 

 each other than in the other species. The absence of avicularia and the 

 nature of the unusually heavy spines are the best diagnostic characters. 

 The ooecia are large and prominent, length 0.24 mm, width 0.30 mm. 



Robertson recorded the species from Puget Sound, Washington, to 

 Monterey Bay, California, and O'Donoghue found it at several localities 

 in British Columbia, shore to 20 fms. 



Hancock Stations: 1232-41, 5 miles from San Pedro Breakwater, 17 

 to 19 fms; 1190-40, Anacapa Passage, 15 to 50 fms; 1271-41, Anacapa Is- 

 land, 23 to 25 fms, southern California, and 1490-42, Cape Arago light- 

 house, reef and bight, Coos Co., Oregon, intertidal. 



fi»- Dendrobeania lichenoides (Robertson), 1900 

 Plate 25, fig. 6 



Flustra lichenoides Robertson, 1900 :322 ; 1905 :291. 



F lustra lichenoides, O'Donoghue, 1923:23; 1925:100; 1926:48. 



This species is a typical Dendrobeania in the manner of budding, the 

 large terminal and lateral rosette plates, the calcification of the lateral 

 and basal terminal walls, and the nature of the ovicells. 



The zoarium consists of very wide, lichen-like fronds which are re- 

 cumbent and loosely attached by radicles. The zooecia appear to be 

 thinner-walled and less heavily chitinized than is usual in the genus. The 

 zooecia are large, 0.75 to 0.90 mm, occasionally more than 1.00 mm in 

 length, considerably narrower on the proximal half and rather suddenly 

 widened, the distal end rather evenly rounded. A minute spine, often 



