Polychaetous annelids; pt. 6. Paraonidae, Magelonidae, Longosomidae, Ctenodrilidae, and Sabellaridae, Sabellaria gracilis, new species, p. 343 |
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NO. 3 HARTMAN : POLYCHAETOUS ANNELIDS 343
side, the middle row includes about 6 long ones on a side, alternating with
6 or 7 short paleae. There are about 16 pairs of papillae surrounding the
outer base of the opercular spines; they increase in length going ventrally.
Abdominal uncini have usually 6 (seldom 5) teeth (pi. 33, fig. 65) in a
row, seen from the side.
S. bella Grube was poorly known until it was re-examined by Augener
(1934, p. 151) and the opercular paleae identified (pi. 33, figs. 57-60).
The description, however, seems to include one misinterpretation, perhaps caused by the macerated condition of the type. Augener says, in
part, "Was die Kronenpaleen betrifft, so waren diese durcheinander
gewirrt und die Paleenkrone drohte schon bei leichter Beruhrung ausein-
ander zu fallen . . . wahrend es unsicher ist, ob die 2te von mir mit Frag-
ezeichen als Innenpalee angesprochene Form der Innenpaleen tatsachlich
dem inneren Paleenkreise angehort." I suggest that Augener's fig. 3Id
(herewith pl. 33, fig. 59) is really an inner palea, but that his fig. 31c
(herewith pl. 33, fig. 60) is the alternating long form of the middle
series; the short paleae are as in plate 33, fig. 58. If this be so, the arrangement and form agree very well with the specimens so designated
herein.
Another specimen from Peru (coll. 832-38) differs from the Atlantic
form chiefly in that the distal end of the outer paleae (pl. 33, fig. 61)
is more closely serrated; the middle (pl. 33, figs. 62, 63) and inner
(pl. 33, fig. 64) paleae are much like those in the other specimens.
The form of opercular paleae, especially the alternating long and
short ones of the middle series, is reminiscent of the condition in S.
alcocki Gravier (1909, p. 298) first described from India. Here, too, the
middle opercular paleae alternate long and short, but in the latter the
outer paleae are much more prolonged distally and provided with a very
long, serrated barb. If this character is highly variable, as seems possible,
it may be necessary to refer S. alcocki to the older S. bella Grube.
The tube consists of thick walls of sand cemented together, forming
masses; they are attached to the under sides of stones, shells, and other
hard objects.
Distribution.—Beaufort, North Carolina, south to Desterro [Flori-
anopolis], Brazil; PIndependencia Bay, Peru. Intertidal.
Sabellaria gracilis, new species
Plate 34, Figs. 66-72
Collections.—901-38 (8); 906-38 (1); 1159-40 (many); 1437-41
(many) ; La Jolla, California, shore (several).
Object Description
Description
| Title | Polychaetous annelids; pt. 6. Paraonidae, Magelonidae, Longosomidae, Ctenodrilidae, and Sabellaridae, Sabellaria gracilis, new species, p. 343 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-10-02~109.tiff |
| Full text | NO. 3 HARTMAN : POLYCHAETOUS ANNELIDS 343 side, the middle row includes about 6 long ones on a side, alternating with 6 or 7 short paleae. There are about 16 pairs of papillae surrounding the outer base of the opercular spines; they increase in length going ventrally. Abdominal uncini have usually 6 (seldom 5) teeth (pi. 33, fig. 65) in a row, seen from the side. S. bella Grube was poorly known until it was re-examined by Augener (1934, p. 151) and the opercular paleae identified (pi. 33, figs. 57-60). The description, however, seems to include one misinterpretation, perhaps caused by the macerated condition of the type. Augener says, in part, "Was die Kronenpaleen betrifft, so waren diese durcheinander gewirrt und die Paleenkrone drohte schon bei leichter Beruhrung ausein- ander zu fallen . . . wahrend es unsicher ist, ob die 2te von mir mit Frag- ezeichen als Innenpalee angesprochene Form der Innenpaleen tatsachlich dem inneren Paleenkreise angehort." I suggest that Augener's fig. 3Id (herewith pl. 33, fig. 59) is really an inner palea, but that his fig. 31c (herewith pl. 33, fig. 60) is the alternating long form of the middle series; the short paleae are as in plate 33, fig. 58. If this be so, the arrangement and form agree very well with the specimens so designated herein. Another specimen from Peru (coll. 832-38) differs from the Atlantic form chiefly in that the distal end of the outer paleae (pl. 33, fig. 61) is more closely serrated; the middle (pl. 33, figs. 62, 63) and inner (pl. 33, fig. 64) paleae are much like those in the other specimens. The form of opercular paleae, especially the alternating long and short ones of the middle series, is reminiscent of the condition in S. alcocki Gravier (1909, p. 298) first described from India. Here, too, the middle opercular paleae alternate long and short, but in the latter the outer paleae are much more prolonged distally and provided with a very long, serrated barb. If this character is highly variable, as seems possible, it may be necessary to refer S. alcocki to the older S. bella Grube. The tube consists of thick walls of sand cemented together, forming masses; they are attached to the under sides of stones, shells, and other hard objects. Distribution.—Beaufort, North Carolina, south to Desterro [Flori- anopolis], Brazil; PIndependencia Bay, Peru. Intertidal. Sabellaria gracilis, new species Plate 34, Figs. 66-72 Collections.—901-38 (8); 906-38 (1); 1159-40 (many); 1437-41 (many) ; La Jolla, California, shore (several). |
| Archival file | hancockunpub_Volume32/AHF-PUB-PE-10-02~109-0.tiff |
