Hydroids of the Allan Hancock Pacific Expeditions since March 1938, p. 272 |
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272 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4
broad as it is long, slightly ventricose, with the margin broader than the
remainder of the hydrotheca. There is a sharp, median tooth on the margin, and the remainder is irregular with not very definite teeth, except for
1 sharp one about the middle of each side. The supracalycine nematophores are large, extending but slightly past the margin of the hydrotheca ; the median nematophore is tubular, straight, not turning up with
the face of the hydrotheca, but not projecting far beyond it; it makes an
angle of about 40° with the internode; the distal end is squarely cut;
near the base, there is a septum extending in from the lower surface. On
the stem, there are 3 tubular nematophores on each internode, 1 on each
side of the hydrocladial process, and 1 below this process.
Gonosome.—The gonangia appear in a single or double series for as
much as 3 cm along the stem in the distal portion; they are oval or slightly
obovate, 0.9 x 0.4 mm, much similar to those in C. vancouverensis Fraser,
with the oval apertures latero-terminally placed. The phylactogonia too
are similar to those of C. vancouverensis but they are not quite so much
branched.
Distribution.—Station 874-38, NE of Anacapa Island, 45 fathoms;
3 miles east of South Point, Santa Rosa Island, 23-26 fathoms; 3 miles
south of Fraser Point, Santa Cruz Island, 20-24 fathoms; 1 mile east
of Smugglers Cove, 19-20 fathoms; 1 mile WNW of Anacapa Island,
41-43 fathoms; NE of Anacapa Island, 45 fathoms; 10^4 miles west of
Point Dume, Calif., 47-48 fathoms; east of Long Point, Santa Catalina
Island, 45-50 fathoms; \y miles east of White Cove, 90-108 fathoms;
1 mile south of San Benito Islands, Lower Calif., 44-49 fathoms; 5y
miles south of San Benito Islands, 69-81 fathoms.
Remarks.—C. pinguis may readily be compared with C. vancouverensis although in general it is a larger species. The stem and the hydrocladia are much similar although they are stouter; the internodal septa
are similarly arranged. The hydrotheca is much stouter for its depth, and
the face is not so straight. The margin has a similar, sharp, median tooth,
but there is 1 sharp, lateral tooth, not so sharp as the median tooth, about
half way along each side. There is little difference in the supracalycine
nematophore, but the terminus of the mesial nematophore is truncate, not
tapered. The differences in the gonosome are rather immaterial. As the
ranges of these two overlap, there is no hesitation in suggesting that A.
pinguis has been derived directly from C. vancouverensis, which has a
much wider known range.
Object Description
Description
| Title | Hydroids of the Allan Hancock Pacific Expeditions since March 1938, p. 272 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-04-05~096.tiff |
| Full text | 272 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 broad as it is long, slightly ventricose, with the margin broader than the remainder of the hydrotheca. There is a sharp, median tooth on the margin, and the remainder is irregular with not very definite teeth, except for 1 sharp one about the middle of each side. The supracalycine nematophores are large, extending but slightly past the margin of the hydrotheca ; the median nematophore is tubular, straight, not turning up with the face of the hydrotheca, but not projecting far beyond it; it makes an angle of about 40° with the internode; the distal end is squarely cut; near the base, there is a septum extending in from the lower surface. On the stem, there are 3 tubular nematophores on each internode, 1 on each side of the hydrocladial process, and 1 below this process. Gonosome.—The gonangia appear in a single or double series for as much as 3 cm along the stem in the distal portion; they are oval or slightly obovate, 0.9 x 0.4 mm, much similar to those in C. vancouverensis Fraser, with the oval apertures latero-terminally placed. The phylactogonia too are similar to those of C. vancouverensis but they are not quite so much branched. Distribution.—Station 874-38, NE of Anacapa Island, 45 fathoms; 3 miles east of South Point, Santa Rosa Island, 23-26 fathoms; 3 miles south of Fraser Point, Santa Cruz Island, 20-24 fathoms; 1 mile east of Smugglers Cove, 19-20 fathoms; 1 mile WNW of Anacapa Island, 41-43 fathoms; NE of Anacapa Island, 45 fathoms; 10^4 miles west of Point Dume, Calif., 47-48 fathoms; east of Long Point, Santa Catalina Island, 45-50 fathoms; \y miles east of White Cove, 90-108 fathoms; 1 mile south of San Benito Islands, Lower Calif., 44-49 fathoms; 5y miles south of San Benito Islands, 69-81 fathoms. Remarks.—C. pinguis may readily be compared with C. vancouverensis although in general it is a larger species. The stem and the hydrocladia are much similar although they are stouter; the internodal septa are similarly arranged. The hydrotheca is much stouter for its depth, and the face is not so straight. The margin has a similar, sharp, median tooth, but there is 1 sharp, lateral tooth, not so sharp as the median tooth, about half way along each side. There is little difference in the supracalycine nematophore, but the terminus of the mesial nematophore is truncate, not tapered. The differences in the gonosome are rather immaterial. As the ranges of these two overlap, there is no hesitation in suggesting that A. pinguis has been derived directly from C. vancouverensis, which has a much wider known range. |
| Archival file | hancockunpub_Volume20/AHF-PUB-PE-04-05~096.tiff |
