Bryozoa of the Pacific coast of America, Borgiola pustulosa, new species, p. 698 |
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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°31'10"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 kenozoids 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
Object Description
Description
| Title | Bryozoa of the Pacific coast of America, Borgiola pustulosa, new species, p. 698 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-14-03~088.tiff |
| Full text | 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°31'10"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 kenozoids 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 |
| Archival file | hancockunpub_Volume21/AHF-PUB-PE-14-03~088.tiff |
