REPORT ON THE POLYZOA. 
73 
Laving a Looked process projecting at eacL lower angle for tLe attacliment of tLe occlusor 
muscles. 
Habitat . — Prince Edward Island, 80-150 fatLoms. 
[Marion Island.] 
(2) Vincularia gothica, var. granulata. 
Slenderer Labit ; surface of ridges and lamina granular. Operculum more rounded 
and tLe cLitinous arch not so strong. 
Habitat . — Station 151, off Heard Island, 75 fatLoms, volcanic mud. 
WLetLer tLis sliould be regarded as a variety or raised to tlie rank of a distinct 
species may be a matter of doubt. TLe difference in tlie cliaracter of tlie surface is 
very marked, as well as tlie slenderer Labit. As tLe collection affords numerous speci- 
mens, it may, Lowever, be observed that no apparently transitional forms are met witli. 
(3) Vincularia labiata, n. sp. 
Character . — Zoarium furcately branched ; branches octagonal. Zooecial area oblong, 
contracted below or subovate, acutely arched above. A projection immediately below the 
oral orifice. Lamina imperforate, surface finely granular. 
The transverse bridge below the internal orifice formed in 
the same way as in Vincularia gothica, except that the 
central pier, instead of rising from the upper edge of the 
lamina, commences above from the conjoined lateral process, 
and gradually descends to become anchylosed to the lamina. 
TLis descending process is very rough and irregular in outline. 
Operculum Cff'OlS x ‘007 semicircular or subcrescentic, with 
a very slender cLitinous border and an internal cLitinous 
arch seen on the posterior aspect, with a hooked process at 
each end for the attachment of the occlusor muscles. 
Habitat . — Station 320, lat. 37° 17' S., long. 53° 52' W., 
600 fatLoms, green sand. 
TLis species may be at once distinguished from the 
preceding by the strong projection forwards of the oral 
bridge, which is quite obvious even before the removal of 
the chitinous epitheca ; and it is curious to observe that the median process or pier of 
the bridge, instead of rising up from the lamina, descends from above and does not 
begin to be formed before the junction of the lateral arches. 1 
1 As the last two forms were not at first distinguished from Vincularia aothica, no figures of them have been 
prepared. 
(ZOOL. CHALL. EXP. — PART XXX. 1884.) Gg 10 
Fig. 3. — Vincularia labiata. 
