Bryozoa of the Pacific coast of America, Bathysoecia hastingsae, new species, p. 660 |
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660 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14
Bathysoecia hastingsae new species
Plate 69, fig. 7
Tubulipora (Tubularia by error) lobulata, Osburn, 1933:16.
? Tubulipora lobulata, Whiteaves, 1874:215; 1901:111.
The zoarium is irregularly fan-shaped or lobed, completely adnate on
stones and shells; thick, especially so near the middle, and sloping downward to a narrow basal lamina. The zooecial walls are heavily calcified,
the tubules thick and the only exposed areas (near the ancestrula) transversely ribbed. There is no evidence of pores except slightly in the primary zooecial area. The peristomes are moderately high, erect, single,
especially near the primary area; farther out they may be single, or
connate in short lines or small groups. The erect portion appears to
consist partly of the upturned distal end of the tubule, as in B. bassleri,
new species, but the condition is not so striking; the remaining portion
is the peristome, which is considerably smaller than the base on which
it arises, diameter 0.16 mm; the peristome is present on most of the
tubules (wherein it differs from B. bassleri, in which most of the tubules
bear no peristomes).
The ovicell is similar to that of the genotype but its surface is less
depressed, a flat, white, finely perforated layer; the chamber extends
downward to the basal lamina, as it does in B. bassleri. The form of the
ovicell is like that of bassleri, usually beginning with an arcuate portion
and extending into narrow lobes which ramify more or less between the
fascicles; in one case a fascicle has been completely surrounded. The
ooeciostome differs sharply from that of B. bassleri, as it is a short erect
cylindrical tube, not at all compressed, connate only at its base, and its
tip circular and noticeably flared, 0.12 mm across and the pore 0.07 mm
in diameter.
Twenty years ago Dr. Anna B. Hastings, after examining a specimen
from Mount Desert, Maine, wrote me that "it is likely that it is T.
lobulata Hassall," (Osburn, 1933:16). Now, with very mature judgment, Dr. Hastings has re-examined the whole problem and writes again
(March 8, 1952) in part as follows:
"This time I say with confidence that three species are involved.
1. T. lobulata Hincks (not Hassall). Excellently described by
Hincks. I need only to add that the ooeciostome is of similar diameter
to the zooecial tubes, but shorter, and is attached to the side of one of
them. It is widely open, directed upwards or a little obliquely with a
slight out-turned rim.
Object Description
Description
| Title | Bryozoa of the Pacific coast of America, Bathysoecia hastingsae, new species, p. 660 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-14-03~050.tiff |
| Full text | 660 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 Bathysoecia hastingsae new species Plate 69, fig. 7 Tubulipora (Tubularia by error) lobulata, Osburn, 1933:16. ? Tubulipora lobulata, Whiteaves, 1874:215; 1901:111. The zoarium is irregularly fan-shaped or lobed, completely adnate on stones and shells; thick, especially so near the middle, and sloping downward to a narrow basal lamina. The zooecial walls are heavily calcified, the tubules thick and the only exposed areas (near the ancestrula) transversely ribbed. There is no evidence of pores except slightly in the primary zooecial area. The peristomes are moderately high, erect, single, especially near the primary area; farther out they may be single, or connate in short lines or small groups. The erect portion appears to consist partly of the upturned distal end of the tubule, as in B. bassleri, new species, but the condition is not so striking; the remaining portion is the peristome, which is considerably smaller than the base on which it arises, diameter 0.16 mm; the peristome is present on most of the tubules (wherein it differs from B. bassleri, in which most of the tubules bear no peristomes). The ovicell is similar to that of the genotype but its surface is less depressed, a flat, white, finely perforated layer; the chamber extends downward to the basal lamina, as it does in B. bassleri. The form of the ovicell is like that of bassleri, usually beginning with an arcuate portion and extending into narrow lobes which ramify more or less between the fascicles; in one case a fascicle has been completely surrounded. The ooeciostome differs sharply from that of B. bassleri, as it is a short erect cylindrical tube, not at all compressed, connate only at its base, and its tip circular and noticeably flared, 0.12 mm across and the pore 0.07 mm in diameter. Twenty years ago Dr. Anna B. Hastings, after examining a specimen from Mount Desert, Maine, wrote me that "it is likely that it is T. lobulata Hassall," (Osburn, 1933:16). Now, with very mature judgment, Dr. Hastings has re-examined the whole problem and writes again (March 8, 1952) in part as follows: "This time I say with confidence that three species are involved. 1. T. lobulata Hincks (not Hassall). Excellently described by Hincks. I need only to add that the ooeciostome is of similar diameter to the zooecial tubes, but shorter, and is attached to the side of one of them. It is widely open, directed upwards or a little obliquely with a slight out-turned rim. |
| Archival file | hancockunpub_Volume21/AHF-PUB-PE-14-03~050.tiff |
