Bryozoa of the Pacific coast of America, ? Disporella octoradiata, p. 718 |
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718 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14
moderately high near the center and become gradually shorter outward,
connate to their tips, which form a single acuminate spine at the point
of junction; the apertures about 0.10 by 0.08 mm.
The central area is concave in younger stages to nearly flat in older
sub-colonies, elliptical in outline; the cancelli about as large as the apertures of the tubules, partially closed by an "iris-like" diaphragm with a
large central pore. The interradial and intercolonial cancelli do not
differ from those of the central area, except that they vary more in size
and the amount of closure.
The ovicells are interradial and covered by a layer of secondary cancelli, and the ooeciostome is short, thin-walled, round, without a flaring
border, barely elevated above the level of the cancelli, and measures
0.08 mm in diameter.
Young marginal sub-colonies develop near the border along with the
proliferation of the lamina after 3 or 4 rows of cancelli are formed.
There are several such incomplete discs at the edge of the zoarium, with
the first few radii outlined on the side toward the center of the zoarium.
This species belongs to the "Radiopora" group in which the sub-
colonies are distinct (the discs not confluent) and their discs similar to
that of the primary colony (see Waters, 1918, plate 4, figs. 1-4), but
appears to be different from any of the recent "Radiopora" species described, Discopora meandrina Peach, Radiopora irregularis J. Y. Johnson, Discoporella pristis MacGillivray, and Lichenopora bullata and
L. magnifica MacGillivray.
Type, AHF no. 128.
Type locality, Hancock Station 1889-49, Cortez Bank, west of the
United States-Mexican boundary, 32°27'05"N, 119°08'04"W, at 15
to 20 fms.
? Disporella octoradiata (Waters), 1904
Plate 75, fig. 6
Lichenopora octoradiata Waters, 1904:97.
Disporella (?) octoradiata, Borg, 1944:257.
Waters' description is as follows: "The zoarium is very solid and
much raised, with the base narrower than the disk. There are a number
of biserial rays, formed by a few zooecia, and in a well developed colony
there are 8 main rays, with indications of the commencement of another
series. The rays do not extend to the border of the zoarium, nor are
the zooecia around the border of the disk elevated, while in the center
of the zoarium the openings are round and vary in size." As far as it
goes this is as fairly complete a description of our two young specimens
as could be wished. The radii are regularly arranged in a short-elliptical
Object Description
Description
| Title | Bryozoa of the Pacific coast of America, ? Disporella octoradiata, p. 718 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-14-03~108.tiff |
| Full text | 718 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 moderately high near the center and become gradually shorter outward, connate to their tips, which form a single acuminate spine at the point of junction; the apertures about 0.10 by 0.08 mm. The central area is concave in younger stages to nearly flat in older sub-colonies, elliptical in outline; the cancelli about as large as the apertures of the tubules, partially closed by an "iris-like" diaphragm with a large central pore. The interradial and intercolonial cancelli do not differ from those of the central area, except that they vary more in size and the amount of closure. The ovicells are interradial and covered by a layer of secondary cancelli, and the ooeciostome is short, thin-walled, round, without a flaring border, barely elevated above the level of the cancelli, and measures 0.08 mm in diameter. Young marginal sub-colonies develop near the border along with the proliferation of the lamina after 3 or 4 rows of cancelli are formed. There are several such incomplete discs at the edge of the zoarium, with the first few radii outlined on the side toward the center of the zoarium. This species belongs to the "Radiopora" group in which the sub- colonies are distinct (the discs not confluent) and their discs similar to that of the primary colony (see Waters, 1918, plate 4, figs. 1-4), but appears to be different from any of the recent "Radiopora" species described, Discopora meandrina Peach, Radiopora irregularis J. Y. Johnson, Discoporella pristis MacGillivray, and Lichenopora bullata and L. magnifica MacGillivray. Type, AHF no. 128. Type locality, Hancock Station 1889-49, Cortez Bank, west of the United States-Mexican boundary, 32°27'05"N, 119°08'04"W, at 15 to 20 fms. ? Disporella octoradiata (Waters), 1904 Plate 75, fig. 6 Lichenopora octoradiata Waters, 1904:97. Disporella (?) octoradiata, Borg, 1944:257. Waters' description is as follows: "The zoarium is very solid and much raised, with the base narrower than the disk. There are a number of biserial rays, formed by a few zooecia, and in a well developed colony there are 8 main rays, with indications of the commencement of another series. The rays do not extend to the border of the zoarium, nor are the zooecia around the border of the disk elevated, while in the center of the zoarium the openings are round and vary in size." As far as it goes this is as fairly complete a description of our two young specimens as could be wished. The radii are regularly arranged in a short-elliptical |
| Archival file | hancockunpub_Volume21/AHF-PUB-PE-14-03~108.tiff |
