NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA CHEILOSTOMATA 117 



of southern California, where it was dredged at 69 stations. It continues 

 to be a common form as far south as Cedros, Natividad and San Benito 

 Islands (11 stations), but was not noted in the warmer waters south of 

 Point San Eugenio, Lower California. 



Gellaria diffusa Robertson, 1905 

 Plate 12, fig. 9 



Cellaria diffusa Robertson, 1905 :289. 

 Cellaria diffusa, O'Donoghue, 1923 :25. 

 Cellularia diffusa, 0'r>onog\\Mt, 1925:100; 1926:50. 

 Cellaria diffusa, Canu and Bassler, 1923 :86. 

 Cellaria fissurifera Canu and Bassler, 1923 :85. 



Zoarium with comparatively few branches ; internodes stout and usu- 

 ally elongate (often more than 25 mm) ; branching irregular, the joints 

 brown or black. 



The zooecia are rather large, 0.60 to 0.80 mm long by 0.28 mm in 

 width, narrowed to about 0.17 mm at the proximal end; the marginal 

 walls high, the cryptocyst flat and granulated and strongly elevated into 

 a rounded lip on the proximal border of the aperture. Just beneath this 

 upturned lip there is a strong, short denticle on either side on the proximal 

 border. The avicularium is small and inconspicuous, about as wide as the 

 proximal end of the zooecium, roughly quadrangular in form, with a 

 semicircular colorless mandible. 



The ooecium opens by a special pore distal to the aperture ; the pore 

 usually rounded with a slightly projecting proximal lip, but occasionally 

 the pore is more or less oval or elliptical. 



The C. fissurifera of Canu and Bassler is placed in synonymy for the 

 following reasons : ( 1 ) the measurements are not sufficiently different to 

 be significant; (2) the avicularia appear to be identical in size and form; 

 (3) the adjacent mural rims are often separated by a furrow; (4) the 

 cryptocyst is deep and flat; (5) the ooecial aperture is often elongate in 

 diffusa especially in older specimens. 



Robertson recorded the species from Puget Sound and from San 

 Pedro and San Diego, California ; O'Donoghue found it at several locali- 

 ties in British Columbia and Puget Sound ; Canu and Bassler list it as 

 C. diffusa and C. fissurifera, both from the Pleistocene of Santa Monica, 

 California. 



Hancock Stations: Rather common in the dredgings along the coast 

 and among the islands of southern California (17 stations). Farther 

 south it occurred at Station 182-34, off James Bay, James Island, Ga- 



