NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 477 



the full width between the cardelles. The operculum has the form of 

 the aperture, moderately chitinized, with a slender bordering sclerite 

 which is thickened for some distance beyond the cardelles, and the muscle 

 attachments close to the border. The primary peristome is thin and 

 inconspicuous; the frontal forms a thick wall about the aperture, but 

 usually leaves a semilunar area proximal to the aperture. No spines and 

 no avicularia. 



No ovicells are present on the 30 colonies examined. 



The general appearance of the species is somewhat like Escharina 

 costata d' Orbigny ( 1847 :44) from Valparaiso, Chile, but in that species 

 the aperture is altogether different, and there are oral spines. 



Type,AHFno. 105. 



Type locality, Hancock Station 369-35: off Fronton Island, near 

 Callao, Peru, 12°07'25"S, 77°ir30''W, at 5 fms; more than 30 colonies 

 encrusting three pebbles. 



