Bryozoa of the Pacific coast of America, Fasciculipora pacifica, new species, p. 665 |
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NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 665
Borg, 1926:303 and 382, gives a complete description of the genotype,
F. ramosa, including the first information about the ovicell, which had
not previously been noticed, no doubt for the reason that it is but little
differentiated from the zooecial tubules. It is very elongate and slender,
slightly expanded on the side of a fascicle, the aperture terminal and
directed forward.
Borg is quite justified in removing this genus from the Frondiporidae,
as the position and nature of the ovicells are very different. However
there is no justification for Borg's resurrection of d'Orbigny's "Family
Fascigeridae," since there appears to be no genus Fascigera, and the pro-
ancestrula and early development, which were hitherto unknown, are
similar to those of the Tubuliporidae.
Fasciculipora pacifica new species
Plate 70, figs. 1, 2, 3, and 4
The zoarium is fungiform from a narrow base, the largest colony in
my possession (somewhat broken) measures about 25 mm in height by
45 mm in the longest diameter, and the longest fascicles are 30 mm.
The base, broken away, is evidently small. The primary branches are
comparatively narrow at the base and gradually enlarge, either branching or becoming flabellate or folded into contorted fascicles which frequently coalesce at their tips or are bridged by small flabellate horizontal
branches consisting of a few zoids. The surface of the adult colony
resembles the meandering contortions of the human cerebrum.
The tubules are excessively elongate, 0.30 to sometimes 0.40 mm in
diameter, in cross-section compressed and hexagonal, on the surface of
the fascicles rounded and more or less indicated by separating grooves.
At the tops of the fascicles the tubes do not project, but on the sides the
occasional tubes which appear to be left behind in the elongation of the
branch usually show a definite short peristome which is more or less
erected and with a round aperture. The walls of the tubules are thickly
perforated by small pores, but on the bases of the older fascia these are
obscured by a secondary thickening which is more or less ribbed transversely.
The ovicells are little modified and resemble the ordinary tubules so
much that they are easily overlooked. As they emerge on the lateral
surface of a fascia they take their place among the normal tubules and
are only slightly larger. They continue upward on a level with the
tubules, becoming gradually wider until they are twice or three times
as wide and with a nearly flat frontal surface. The ooeciostome is a
Object Description
Description
| Title | Bryozoa of the Pacific coast of America, Fasciculipora pacifica, new species, p. 665 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-14-03~055.tiff |
| Full text | NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 665 Borg, 1926:303 and 382, gives a complete description of the genotype, F. ramosa, including the first information about the ovicell, which had not previously been noticed, no doubt for the reason that it is but little differentiated from the zooecial tubules. It is very elongate and slender, slightly expanded on the side of a fascicle, the aperture terminal and directed forward. Borg is quite justified in removing this genus from the Frondiporidae, as the position and nature of the ovicells are very different. However there is no justification for Borg's resurrection of d'Orbigny's "Family Fascigeridae," since there appears to be no genus Fascigera, and the pro- ancestrula and early development, which were hitherto unknown, are similar to those of the Tubuliporidae. Fasciculipora pacifica new species Plate 70, figs. 1, 2, 3, and 4 The zoarium is fungiform from a narrow base, the largest colony in my possession (somewhat broken) measures about 25 mm in height by 45 mm in the longest diameter, and the longest fascicles are 30 mm. The base, broken away, is evidently small. The primary branches are comparatively narrow at the base and gradually enlarge, either branching or becoming flabellate or folded into contorted fascicles which frequently coalesce at their tips or are bridged by small flabellate horizontal branches consisting of a few zoids. The surface of the adult colony resembles the meandering contortions of the human cerebrum. The tubules are excessively elongate, 0.30 to sometimes 0.40 mm in diameter, in cross-section compressed and hexagonal, on the surface of the fascicles rounded and more or less indicated by separating grooves. At the tops of the fascicles the tubes do not project, but on the sides the occasional tubes which appear to be left behind in the elongation of the branch usually show a definite short peristome which is more or less erected and with a round aperture. The walls of the tubules are thickly perforated by small pores, but on the bases of the older fascia these are obscured by a secondary thickening which is more or less ribbed transversely. The ovicells are little modified and resemble the ordinary tubules so much that they are easily overlooked. As they emerge on the lateral surface of a fascia they take their place among the normal tubules and are only slightly larger. They continue upward on a level with the tubules, becoming gradually wider until they are twice or three times as wide and with a nearly flat frontal surface. The ooeciostome is a |
| Archival file | hancockunpub_Volume21/AHF-PUB-PE-14-03~055.tiff |
