NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 337 



Hancock Stations: 167-34, Charles Island; and 182-34 and 462, 

 James Island, all from the Galapagos. Shallow water to 30 fms. 



Genus GEMELLIPORIDRA Canu and Bassler, 1927 



"The ovicell is hyperstomial and always closed by the operculum. 

 The frontal and ovicell are covered by tremopores. The aperture bears 

 two small lateral indentations separating a very large suborbicular anter 

 from a very small concave poster. The operculum bears two lateral 

 marks corresponding to oral indentations and two linear muscular at- 

 tachments. There are two oral avicularia irregularly arranged on each 

 side of the aperture. The complete colonies are multilaminar and the 

 zooecia are then poorly oriented." Genotype, Gemelliporidra typica Canu 

 and Bassler, 1927:7. 



Gemelliporidra lata new species 

 Plate 55, fig. 14 



Zoarium encrusting, multilaminar, the zooecia turned in every direc- 

 tion in the superficial layers. Zooecia of moderate size, usually between 

 0.55 and 0.65 mm long by 0.40 to 0.50 mm long, but occasionally 

 broader than long, distinct. Frontal a tremocyst with numerous small 

 pores which enlarge at the surface; little inflated and heavily calcified. 

 The primary aperture is suborbicular back to the small cardelles, behind 

 which is a shallow, slightly sinuate anter. The frontal covers the primary 

 peristome and forms a thick wall which is only slightly elevated; there 

 are small pointed oral avicularia on one or both sides of the aperture, 

 irregularly arranged; in addition there is rarely a giant avicularium 

 which takes the place of a zooecium, with a long mandible which is 

 broadly triangular at the base, narrow thence to the tip, and attached 

 by a strong pivot bar. 



Ooecium large, 0.40 mm wide, hemispherical and covered with 

 tremopores like those of the genotype, G. typica; the frontal pores are 

 smaller and much more numerous. 



Type AHF No. 66. 



Type locality. Station 299, San Jose del Cabo at the tip of the 

 Lower California peninsula, 22°55'30"N, 109°47'15"W, one colony, 

 dead, at 82 fms. 



