48 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



and browner toward the border, and the border of the aperture is also 

 thick and brown. Dietellae present. No spines, no avicularia. 



The ovicell is inconspicuous, transverse, very shallow, smooth or be- 

 coming roughened, or with a small median callosity. 



This species resembles^, gigantea Canu and Bassler (1928:20) from 

 the Gulf of Mexico, but it is even larger and the operculum is much 

 larger (0.20 mm wide in gigantea). It is still larger than in A. filumj the 

 other species from the Pacific coast. 



Type,AHFno. 15. 



Type Locality, Hancock Station 1271-41, off Anacapa Island, south- 

 ern California, 33°59'50''N, 119°24'30''W, 26 fms. Also Stations 1284- 

 41, Santa Rosa Island, and 1190-40, Anacapa Island, southern Cali- 

 fornia; 275-34, Tenacatita Bay, Mexico, and 810-38, Barrington Island, 

 Galapagos, 15 to 48 fms. The type colony from Anacapa Island, southern 

 California, measured about 50 mm across, practically covering a dead 

 shell. 



Genus GRANOSINA Canu and Bassler, 1933 

 The ovicell is endzooecial. A setiform transverse avicularium sur- 

 mounts each zooecium. The dietellae are extremely conspicuous and 

 about four in the distal half of the lateral wall, their openings to the 

 zooecia often large. Genotype, Membranipora coronata Hincks, 1881 

 (after Canu and Bassler). 



The genus is here referred to the Family Hincksinidae with endo- 

 zooecial ovicells. 



Cranosina colombiana new species 

 Plate 4, fig. 3 



Zoarium encrusting on shell, thin and white. Zooecia elongate ovoid, 

 varying considerably in form and size, average length 0.55 mm (0.50 to 

 0.65), width 0.30 mm (0.25 to 0.40) ; separated by narrow grooves; 

 mural rim thin, beaded in advanced calcification, slightly more elevated 

 distally; gymnocyst and cryptocyst usually vestigial. There are 4 or 5 

 weak spines on each side, somewhat curved over the opesia, but no distal 

 spines. 



At the distal end of each zooecium (occasionally wanting) and oc- 

 cupying a position in the zooecial series, is an avicularian chamber, usu- 

 ally more or less square and measuring about 0.15 mm in each dimension, 

 though there is much variation in the size. The avicularium is trans- 

 verse, the mandible decurved strongly (sometimes slightly curved side- 



