NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 495 



The ovicell is prominent, globose and evenly perforated, about 0.22 

 mm wide, and becomes partially submerged in older stages. 



Pourtales and Smitt recorded the species from off Sand Key, Florida, 

 100 fms, and off Havana, Cuba, at 270 fms. Osburn listed it off 

 Beaufort, North Carolina, at 13 fms. 



Hancock Station 446, James Bay, James Island, Galapagos, at 54 

 fms. It is an unusual record but the identification appears to be satis- 

 factory. 



Genus HOLOPORELLA Waters, 1909 



Cellepores in which the proximal lip of the aperture is more or 

 less straight and the ovicell an imperforate, wide-open hood. The 

 operculum usually has a sclerite near the border on the sides. Suboral 

 avicularia are usually present, located on the disto-mesial side of an 

 asymmetrical umbonate process, small, occasionally wanting; frontal 

 avicularia are usually much larger and spatulate in form, often wanting 

 over much of the zoarium. Oral spines usually present. The form of the 

 aperture and the cap-shaped, imperforate ovicell readily separate this 

 genus from others of the family. Genotype, Cellepora descostilsii Audouin, 

 1826. 



The proximal lip of the aperture asymmetrically often bears a small 

 rounded notch which bears no relation to the operculum, and in at 

 least one species there are minute denticles on the proximal border. 

 Some of the species may be highly pigmented. Usually the zoaria are 

 encrusting and nodular, but they may rise into frills or strong rounded 

 branches. 



Key to Species of Holoporella 



1. Proximal border of aperture unmodified, straight or slightly arcu- 



ate 2 



Proximal border of aperture modified by denticles or notches . . 4 



2. Zoarium dark pigmented; suboral rostrum high and pointed, the 



white tips conspicuous albirostris 



Unpigmented ; rostrum comparatively low 3 



3. Zoarium erect, branching, tree-like; interzooecial avicularia un- 



usually long, sides nearly parallel, spines small . . . hancocki 

 Zoarium encrusting; interzooecial avicularia long-ovate; spines 

 usually flattened, oar-shaped ; peristomes of lower layers con- 

 tinued upward as tubular processes peristomata 



