NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 359 



Genus GEMELLIPORELLA Canu and Bassler, 1920 



The ovicell is perforated, hyperstomial, and not closed by the oper- 

 culum. The form of the aperture is like a keyhole. The frontal is a 

 granular pleurocyst, with areolar pores. Avicularia are present near the 

 aperture. Genotype, Gemelliporella vorax Canu and Bassler, 1923:111. 



This genus is much like Hippoporina in the form of the aperture 

 and the nature of the frontal, but it has a finely perforated ovicell. 



Gemelliporella globuHfera new species 

 Plate 41, figs. 9-12 



The zoarium is encrusting, usually on shells, white or pale yellow. 

 Zooecia moderately small, 0.30 to 0.40, rarely as much as 0.50 mm long, 

 by 0.25 to 0.35 mm wide (occasionally wider when the avicularium is 

 large) ; inflated and distinct when young. The frontal is a thick, evenly 

 granulated olocyst (? pleurocyst), with a very few areolar pores. The 

 aperture is elongate, 0.13 to 0.16 mm long by 0.10 to 0.12 mm wide, 

 the anter somewhat pyriform, the cardelles sharp and directed backward, 

 the poster semicircular and one-half to two-thirds as wide as the anter; 

 the peristome low and thin, not covered by the bordering frontal. The 

 operculum has the form of the aperture, yellowish and well chitinized, 

 with 1 thickened marginal sclerite. The avicularia are situated at thp 

 side of the aperture, frequently paired, the mandible semicircular to 

 short-spatulate, rarely long-spatulate, varying much in size, the larger 

 ones distorting the form of the zooecium, the chamber little elevated. 



The ovicell is unusually prominent, globular, 0.18 to 0.22 mm in 

 width, perforated by numerous small pores ; not closed by the operculum. 



The species appears to be much like Hippoporina fallax Canu and 

 Bassler (1930:320) from the Philippines, which may possibly belong to 

 this genus, but the poster of the aperture is larger, the operculum lacks 

 the inner sclerite, the ovicell is coarsely granulated instead of smooth, 

 and the avicularia different. 



Type, AH F no. 72. 



Type locality, Hancock Station 1303-41, one-half mile N of Piatt 

 Point, Santa Cruz Island, southern California, 34°03'50"N, 119°45' 

 25"W, 36 fms, several colonies. Also taken at Station 1251-41, the 

 San Benito Islands, Lower California, 28°12'35''N, 115°34'35"W, at 

 79 fms; off the San Pedro Breakwater at 20 fms, and Cortez Bank on 

 the Mexican Border at 32 fms. Also from the Pleistocene of Newport 

 Harbor, California, G. P. Kanakoff, collector. 



