NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 705 



in form, size and arrangement, and separated by 1 or 2 rows of cancellae, 

 often with "pin-head" spicules. The apertures of the tubules are some- 

 what irregular in form and about 0.06 to 0.08 mm in diameter. 



The brood-chamber (ovicell) in smaller zoaria occupies only the 

 central area, with the ooeciostome a little excentric or frequently nearer 

 the border of the area. The ooeciopore is about as large as the zooecial 

 apertures; the ooeciostome is erect with a short cylindrical stalk which 

 flares, trumpet-shaped, slightly ovate, 0,13 to 0.16 mm by 0.16 to 0.20 

 mm in breadth at the tip. The roof of the brood-chamber is thin and 

 perforated by numerous small pores, and above this are secondary can- 

 cellae of irregular size and form. Strong irregular raised lines often 

 give the area a coarsely reticulated appearance. 



The zoaria are often complex, with daughter colonies budding off 

 from the sides, and these are frequently very irregular, both in shape 

 and in the arrangement of the uniserial rays. In the daughter colonies 

 the brood-chambers are irregularly situated, often small and situated 

 between the series of tubules, sometimes near the margin. Even in 

 larger simple colonies there may be small secondary brood-chambers near 

 the margin. 



The biserial rays with high peristomes, the large and irregular can- 

 celli which frequently bear "pin-head" spicules within their apertures, 

 and the closure of older cancelli by a thin calcified porous membrane, 

 readily distinguish this species from any other of the Pacific coast, even 

 in the absence of an ooeciostome. 



It is a common species along the shore and about the islands of 

 southern California, extending southward to Lower California and the 

 Gulf of California ; common also in the Pleistocene deposits of the same 

 area; but there are only two dredging records, which indicates that it 

 is definitely a shallow water species. 



Hancock Stations: 1378-41, Catalina Island, 2 to 3 fms; 1071-40, 

 San Felipe Bay, Gulf of California at 2^^ fms. 



Lichenopora novae-zelandiae (Busk), 1875 

 Plate 74, fig. 4 



Discoporella novae-zelandiae Busk, 1875:32. 



Lichenopora radiata, Robertson, 1910:262. 



Lichenopora novae-zelandiae, Harmer, 1915:155 (references). 



Zoarium encrusting on shells and stems; on small stems there is a 

 very short stipe, and the margin of the basal lamina is turned upward, 

 saucer-shaped •; zoarial budding rarely occurs at the margin. The tubules 



