Bryozoa of the Pacific coast of America, Alcyonidium parasiticum; Alcyonidium mammillatum, p. 729 |
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NO. 3 osburn : EASTERN pacific BRYOZOA—CYCLOSTOMATA 729
previously reported by Robertson, 1900, and O'Donoghue, 1923, 1926,
in the waters off Alaska, British Columbia, and Puget Sound.
The specimens in the Hancock collection are from off Point Barrow,
Alaska, Arctic Research Laboratory, G. E. MacGinitie collector;
Lenard Harbor, Alaska, Canoe Bay, Alaska, Tomales Bay, California,
AHF stations 1607-48 and 1656-48 in depths ranging from intertidal
to 40 fathoms. (8 stations.)
Alcyonidium paras it icum (Fleming), 1828
Plate 77, fig. 2
Alcyonium parasiticum Fleming, 1828:518.
Alcyonidium parasiticum, O'Donoghue, 1923:191.
The collection has one large zoarium, thin, incrusting upon an eroded
mollusk shell. The individual zooecia may be distinguished with some
difficulty, due to the deposit of sand and mud which covers most of the
zoarium. The zooecia are small, irregular in morphology, the variation
ranging from nearly square zooecia to those that are elongated to nearly
diamond-shaped. All of the zooecia that could be examined possessed
raised oral papillae on the ventral surface, and minute border papillae.
The argillaceous cover upon the cuticle prevented sectioning of a portion
of the specimen.
This species is well distributed throughout the colder Atlantic waters
and has been reported by O'Donoghue from the Pacific northwest.
The specimen in the Hancock collection came from Tomales Bay,
California, at a depth of 5 fathoms, collector R. C. Osburn.
Alcyonidium mammillatum Alder, 1857
Plate 77, fig. 4
Alcyonidium mammillatum Alder, 1857:154.
Alcyonidium mamillatum, O'Donoghue, 1923:191; 1926:54.
The zoaria form dark brown, thin, rough, irregular incrustations
upon mollusk shells. The zooecial walls are well defined, except in the
portions of the zoaria that are covered by foreign matter. The zooecia
vary in shape from an elongated irregular oval to rectangular. Distally
the zooecial apertures are raised upon short cylindrical, transversely
wrinkled projections.
The literature reveals that this species is moderately well known from
the cold waters of the Atlantic. On the Pacific coast of North America,
O'Donoghue has reported it from the vicinity of Vancouver Island, 1923,
1926.
Object Description
Description
| Title | Bryozoa of the Pacific coast of America, Alcyonidium parasiticum; Alcyonidium mammillatum, p. 729 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-14-03~119.tiff |
| Full text | NO. 3 osburn : EASTERN pacific BRYOZOA—CYCLOSTOMATA 729 previously reported by Robertson, 1900, and O'Donoghue, 1923, 1926, in the waters off Alaska, British Columbia, and Puget Sound. The specimens in the Hancock collection are from off Point Barrow, Alaska, Arctic Research Laboratory, G. E. MacGinitie collector; Lenard Harbor, Alaska, Canoe Bay, Alaska, Tomales Bay, California, AHF stations 1607-48 and 1656-48 in depths ranging from intertidal to 40 fathoms. (8 stations.) Alcyonidium paras it icum (Fleming), 1828 Plate 77, fig. 2 Alcyonium parasiticum Fleming, 1828:518. Alcyonidium parasiticum, O'Donoghue, 1923:191. The collection has one large zoarium, thin, incrusting upon an eroded mollusk shell. The individual zooecia may be distinguished with some difficulty, due to the deposit of sand and mud which covers most of the zoarium. The zooecia are small, irregular in morphology, the variation ranging from nearly square zooecia to those that are elongated to nearly diamond-shaped. All of the zooecia that could be examined possessed raised oral papillae on the ventral surface, and minute border papillae. The argillaceous cover upon the cuticle prevented sectioning of a portion of the specimen. This species is well distributed throughout the colder Atlantic waters and has been reported by O'Donoghue from the Pacific northwest. The specimen in the Hancock collection came from Tomales Bay, California, at a depth of 5 fathoms, collector R. C. Osburn. Alcyonidium mammillatum Alder, 1857 Plate 77, fig. 4 Alcyonidium mammillatum Alder, 1857:154. Alcyonidium mamillatum, O'Donoghue, 1923:191; 1926:54. The zoaria form dark brown, thin, rough, irregular incrustations upon mollusk shells. The zooecial walls are well defined, except in the portions of the zoaria that are covered by foreign matter. The zooecia vary in shape from an elongated irregular oval to rectangular. Distally the zooecial apertures are raised upon short cylindrical, transversely wrinkled projections. The literature reveals that this species is moderately well known from the cold waters of the Atlantic. On the Pacific coast of North America, O'Donoghue has reported it from the vicinity of Vancouver Island, 1923, 1926. |
| Archival file | hancockunpub_Volume21/AHF-PUB-PE-14-03~119.tiff |
