NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 189 



becomes covered by an ectooecium which is composed of 3 or 4 pairs of 

 radiating costules similar to those of the front and with similar lacunae. 

 The costules form strong buttresses around the outer border and meet 

 at the top in a small umbonate process. The sides of the ectooecium ex- 

 tend backward to the avicularian processes. 



The ancestrula is membraniporoid with 4 minute spines on either 

 side; it measures 0.26 mm long by 0.18 mm wide. 



In six colonies studied no vicarious avicularia were observed. The 

 oral avicularia appear to arise from the zooecial border just outside of 

 the peristome. Dietellae similar to those of C. radiata are present. 



Notwithstanding the form of the aperture and the presence of frontal 

 avicularia, this species appears to be congeneric with C. radiata, as the 

 nature of the frontal, the dietellae and the closure of the ovicell are those 

 of Colletosia. 



Type, AHF no. 47. 



Type locality, Hancock Station 270, east coast of Angel de la Guardia 

 Island, Gulf of California, 29°29'00"N, 113°27'00"W, 14 fms, two 

 colonies. Also at Station 155-34, off Tagus Cove, Albemarle Island, Ga- 

 lapagos Islands, 50 to 60 fms, 3 colonies; 275, Raza Island, Gulf of Cali- 

 fornia, 40 fms, and oil Magdalena Bay, Gulf of California, 18 fms. 

 Also from the Pleistocene of Newport Harbor Mesa, southern California, 

 1 colony complete with ovicell, within the cup of Discoporella umbellata, 

 G. P. Kanakoff, collector. 



Genus FIGULARIA Jullien, 1! 



Pericyst with well-defined costae, usually with numerous fusions giv- 

 ing rise to a row of lacunae, occasionally without lateral fusions, the 

 costae then separated by undivided slits. Orifice closed by a completely 

 chitinized operculum which articulates with lateral condyles. Oral spines 

 usually wanting. Ovicells large, hyperstomial, the ectooecium generally 

 with membranous fenestrae. Avicularia, when present vicarious. No 

 dietellae. The gymnocyst usually covering a considerable portion of the 

 frontal area. (After Levinsen, 1909). Genotype, Lepralia fipularis Johns- 

 ton, 1847:314. 



