698 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



I presume this to be the same species as that from Japan described by 

 Borg, since the zoarial and zooecial characters appear to agree closely, 

 but in the absence of brood-chambers the identification is necessarily 

 tentative. 



The species has hitherto been known only from Sagami Bay, Japan. 



Hancock Station, 310-35, off Bindloe Island, Galapagos, 0°18'20"N, 

 90°3riO"W, at 15 fms, rocky bottom. 



Borgiola pustulosa new species 

 Plate 73, figs. 5, 6, 7, 8, and 9 



Zoarium encrusting on rocks and shells, with no evidence of erect 

 branches, the surface with numerous low rounded or elliptical elevations 

 which are rather evenly spaced, the elevated areas about as wide as 

 the lower areas between them. The largest colony (type) measures about 

 70 mm long by 50 mm wide by 10 mm thick, but is broken and was 

 evidently considerably larger. Another fragment is 50 mm in width, and 

 a third fragment which is on a shell, is 25 mm long by 10 mm wide and 

 appears to have been about twice that width. The color is white to 

 yellowish red. 



On the lower, general, surface the apertures of the autozoids are 

 often quite regularly spaced and surrounded by a single row of keno- 

 zoids about half as large as the autozoids ; on the pustules the autozoids 

 are irregularly disposed and the kenozoids more numerous and irregular 

 in size, and occasionally there are small areas consisting entirely of 

 kenozoids. Over most of the surface the tubes of the autozoids project 

 very slightly above the level of the surrounding kenozoids, the rim round 

 or nearly so ; but around the borders of the pustules they are noticeably 

 higher and produced on one side into a pointed process, "giving the 

 aperture a distinctly oblique appearance," as Borg describes them in 

 C. rugosa (1933:335). On older areas both autozoids and kenozoids 

 are frequently closed, slightly below the level of the rim. The apertures 

 of the autozoids are about 0.18 mm in diameter but vary considerably. 

 The kenozoids vary excessively, from 0.03 to 0.12 in diameter, but 

 average about 0.08 mm, and they also vary in form. 



The autozoids arise on a basal lamina which extends rather narrowly 

 around the margin of the zoarium, at first prone but curving upward 

 at once into an erect position. 



The brood-chambers are spacious cavities, as much as 2.50 mm in 

 width and 0.50 mm in depth, resembling those of Heteropora with the 

 kenozoid walls absorbed and closed on the floor of the cavity, and most 



