NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 329 



Dakaria sertata Canu and Bassler, 1930 

 Plate 57, figs. 12-13 



Dakaria sertata Canu and Bassler, 1930:17. 

 Dakaria sertata, Marcus, 1937:95. 



Zoarium encrusting on corallines, shells, etc. ; sometimes multilaminar 

 in which case the zooecia are poorly oriented. The zooecia are of moderate 

 size, 0.45 to 0.65 mm long by 0.30 to 0.45 mm wide, more or less ellipti- 

 cal or quadrangular when free-growing but assuming all sorts of propor- 

 tions when crowded or in superficial layers; the front ventricose, sepa- 

 rated by deep grooves ; the frontal a tremocyst with numerous small pores ; 

 in full calcification the pores become infundibuliform and the front is 

 slightly granulated. The primary aperture, 0.16 mm wide by 0.14 to 

 0.16 mm long, is nearly round except that the broad sinus, extending 

 between the cardelles, is often slightly angulated. The operculum has 

 the form of the aperture, with a comparatively broad bordering sclerite 

 and the muscle attachments near the margin. The peristome is slightly 

 elevated and thin; the frontal forms a secondary peristome which is 

 broader and is decorated with small rounded tubercles, especially on the 

 proximal border though often the tubercles form a complete "necklace" 

 about the aperture. No spines, no avicularia. 



The ovicell is deeply embedded but conspicuous, rounded, large (0.40 

 to 0.45 mm broad) ; its front a tremocyst with numerous pores which 

 are somewhat smaller than those on the frontal ; closed by the operculum. 



Recorded from the Galapagos Islands by Canu and Bassler and later 

 by Marcus from Santos Bay, Brazil. 



Hancock Stations: 30-33, Hood Island, 190-34 and 450, Albemarle 

 Island, 453, Gardner Island, Galapagos; 136-34, Clarion Island, west 

 of Mexico; 557-36, Isla Partida, 275, Raza Island, and 276, San Este- 

 ban Island, Gulf of California; 1191, Cortez Bank, near the United 

 States-Mexican boundary; 232, San Miguel Island, 874-38, Anacapa 

 Island, 1294-41, Santa Cruz Island, and 1143-40, oflE Portuguese Point, 

 southern California. The known distribution is from little south of the 

 equator to slightly north of 34°N Lat., and from shore down to 60 fms. 



Dakaria biserialis (Hincks), 1885 

 Plate 39, figs. 5-6 



Schizoporella biserialis Hincks, 1885:250; 1889:9. 



Zoarium encrusting on a coralline, white and shining. Zooecia more 

 or less hexagonal, distinct with deep grooves, 0.55 to 0.75 mm long by 

 0.40 to 0.55 mm wide; the frontal a tremocyst, considerably inflated, 



