NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 645 



Hancock Stations: 275, Raza Island, Gulf of California, 40 fms; 

 305-34, Clarion Island, west of Mexico, 15 fms; 1978-50, Ranger Bank, 

 Lower California, 71 fms; and 1143-40, off Portuguese Point, near San 

 Pedro, 34 fms, 1413-41, San Miguel Island, 34 fms, 1064, Santa Bar- 

 bara Island, 38 fms, and 1240, off San Diego, all from southern Cali- 

 fornia. 



The O'Donoghues have recorded under this genus a number of other 

 species from British Columbia which have not appeared in our material. 

 D. (Entalophora) capitata (Robertson, 1900), 1926:22. 

 D. (Entalophora) clavatn (Busk, 1859), 1926:23. 

 D. (Stomatopora) expansa (d'Orbigny, 1851), 1926:23. 

 D. (Stomatopora) depressa (O'Donoghue, 1923), 1926:23. 

 D. (Tubulipora) labiata (O'Donoghue, 1923), 1926:23. 

 D. (Tubulipora) striata (O'Donoghue, 1923), 1926:24. 

 D. (Entalophora) vancouverensis (O'Donoghue, 1923), 1926:23. 



Diaperoecia johnstoni (Heller), 1867 

 Plate 67, fig. 4 



Criserpia Johnstoni Heller, 1867:126. 

 Stomatopora Johnstoni, Hincks, 1880:430. 

 Stomatopora johnstoni, O'Donoghue, 1923:11. 

 Diaperoecia johnstoni, O'Donoghue, 1926:23. 



Our specimens agree very closely with the Stomatopora johnstoni of 

 Hincks from the British Isles, though Hincks did not have the ooecio- 

 stome. 



The zoarium is encrusting, branching usually dichotomously ; the 

 branches short, narrow at the base with 1 or 2 rows of tubules for a 

 short distance, beyond which they suddenly become fan-shaped or tri- 

 angular with 4 to 6 or 8 tubules in cross-section. The tubules are about 

 0.26 mm in diameter, convex and conspicuously perforated; the peri- 

 stomes are moderately high, more or less erect, not connate and not 

 seriate, 0.18 to 0.22 mm in diameter, the aperture about 0.17 mm. 



The ovicells are as Hincks described them, "dilated and very ventri- 

 cose, wedge-shaped," though there is considerable variation in the form ; 

 thickly perforated with conspicuous pores; surrounding from 1 to 5 

 peristomes. The ooeciostome, located near the middle of the ovicell, is 

 as high as the peristomes and about half as large in diameter, the orifice 

 0.09 mm, situated at the side of a peristome and connate with it for a 

 short distance at the base. 



