186 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Puellina setosa (Waters), 1899 

 Plate 29, fig. 4 



Cribrilina setosa Waters, 1899 :8. 

 Cribrilina radiata var. a Hincks, 1880:186. 



Cribrilina radiata, form innominata, form with vibraculoid setae, Hincks, 

 1884:14. 



Zoarium encrusting in a thin white layer on shells and stones. The 

 zooecia are small, averaging about 0.40 mm long by 0.30 mm in width 

 though there is much variation and shorter zooecia may be as broad as 

 long, and their inflated costate areas cause them to appear very distinct. 

 A smooth border, often quite conspicuous at the proximal end, surrounds 

 the area which often is almost round. The pericyst is formed by 6 to 8 

 spines on each side, the distal pair uniting to form the proximal border 

 of the aperture, while the others unite at the center of the front where 

 they usually produce a small round low umbo at some distance back of 

 the oral border. The lacunae are rounded, 2 to 4, except on the apertural 

 bar where there is usually only one in the middle (occasionally 2 or 3). 

 The aperture is small, semicircular, 0.08 mm wide by 0.05 mm long; the 

 operculum thin with a slightly thickened border which is continuous ex- 

 cept on the proximal margin ; the peristome low, with 3 to 5 small slender 

 spines. A minute setose avicularium is situated on either side of the 

 aperture about opposite the proximal border; the chamber is minute and, 

 though muscles are present, I have been unable to determine their mode 

 of operation. 



The ovicell is hyperstomial, hemispherical, prominent, about 0.18 mm 

 wide and long, with a low longitudinal keel from which delicate striae 

 radiate. 



The species has much resemblance to P. gattyae (Busk) from the 

 coasts of Europe, but comparison with Mediterranean specimens of that 

 species shows the costal area of setosa to be larger, the spines smaller, and 

 the zooecia somewhat larger. 



Recorded by Waters from Madeira and Naples, and by Hincks from 

 the British Islands and British Columbia. 



Hancock Stations: 431-35, off Octavia Rocks, Colombia; 155-34, 

 Albemarle Island, Galapagos; 873-38 and 1269-41, Anacapa Island, and 

 1050, San Miguel Island, southern California; and Albatross Sta. 2886, 

 off the coast of Oregon, 20 to 60 fms. Also several colonies collected by 

 Dr. John L. Mohr at Friday Harbor, San Juan Island, Puget Sound, 

 Washington. 



