NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 373 



long and spatulate; the small ones are usually beside the aperture and 

 directed forward, the large ones situated more proximally are directed 

 laterally. 



The ovicell is hyperstomial, much immersed, costate like the frontal, 

 with a central umbonate process. 



Recorded from New Zealand and Australia. 



Hancock Stations: 143-34, Wenman Island, shore; 155-34 and 455, 

 Albemarle Island, 50 to 70 fms; 788-38, Daphne Major Island, 55 fms, 

 all from the Galapagos. Also 271, Angel de la Guardia Island, Gulf 

 of California, 29°3r00"N, 113°28'30"W, at 10 fms. These are the 

 first records of this species from the American coasts and indicate a 

 wide distribution. 



Genus TRYPEMATELLA Canu and Bassler, 1920 



The ovicell is hyperstomial and closed by the operculum only for the 

 passage of the eggs. The aperture is semilunar with proximal border a 

 little concave. The frontal is a thick pleurocyst with large areolar pores. 

 Two large lateral avicularia are placed below the aperture ; also a small 

 rounded avicularium on either side of the aperture. Genotype, Trype- 

 matella papulijera, Canu and Bassler, 1923:135. 



Trypematella umbonula new species 

 Plate 43, figs. 13-14 



Zoarium encrusting on a shell, multilaminar, white, rough in ap- 

 pearance. Zooecia of moderate size, 0.40 to 0.50 mm long by 0.30 to 

 0.40 mm wide; the frontal a thick pleurocyst with large areolar pores, 

 occasional additional smaller pores, short costal ridges and irregulari- 

 ties of surface, and a prominent suboral umbo. The primary aperture 

 is wider than long, 0.12 by 0.10 mm, the proximal border broadly 

 arcuate or with a broad shallow sinus and without cardelles ; peristome 

 low and thin, with 4 delicate spines which are seen only on marginal 

 zooecia. The avicularia are distributed as follows : a small rounded one 

 on each side of the aperture, another of similar size and form on the 

 distal side of the suboral umbo, and more rarely a larger pointed one 

 on the side of the zooecial front. 



The ovicell is moderately large, 0.20 to 0.25 mm wide and broader 

 than long, prominent when young but becoming considerably embedded, 

 somewhat flattened above the orifice, an ovate fenestra near the proximal 



