REPORT ON THE POLYZOA. 
41 
with very long tubular pedicels arise from the front of each zocecium ; one much larger 
than the other, and of a different form, arises low down from the tubular prolongation 
of the cell, and the other much smaller from the front, close below the aperture- 
Numerous slender radical or clasping tubes arise from the backs of the zooecia. 
Habitat. — Station 157, lat. 53° 55' S., long. 108° 35' E., 1950 fathoms, Diatom ooze. 
The structure of this magnificent species is of extreme delicacy, so much so indeed 
that it is difficult to discern the transition from the diaphanous membrane which covers 
in the frontal aperture to the cell-wall proper ; both textures are as transparent as glass 
and excessively thin. The avicularia are of two distinct kinds, one of each being 
attached normally to every zocecium. The larger kind is elongated, and when the 
mandible is thrown back a digitiform process protrudes (fig. le). This form of 
avicularium is supported on a very long jointed, tubular, flexible, peduncle, which in the 
living state is probably cylindrical, but, perhaps from the action of the alcohol, it usually 
appears flattened and often thrown into regular zig-zag folds, leading to the suspicion 
that it may contain a contractile element. The wall of the peduncle of both kinds of 
avicularia is very finely ringed. The numerous jointed tubular threads proceeding from 
the back of the zooecia appear to be of the same nature as those which connect the 
branches in Bicellaria reticulata , from which they differ, however, in their smaller 
diameter, and in their never, apparently, acting as connectives. Each of these tubes 
terminates, as it would seem, in a very delicate, but still jointed or segmented hollow 
filament, upon which may often be seen Globigerina shells and other Foraminifera 
hanging. It may be supposed, therefore, that the zoarium in its natural state lies 
prostrate on the ooze, and is affixed by numerous points as well as by a central 
peduncle. 
The polypide has eighteen or twenty tentacles, and appears to be capable of being 
entirely protruded to a considerable distance ; though how this protrusion is effected is 
very difficult of explanation. 
3 7 - 
(7) Bugula margaritifera, n. sp. (PI. VIII. fig. 4). 
Character. — Zoarium 3 to 4 inches high, lax and straggling. Zooecia very long and 
narrow, entirely open in front. A very small spinous process at each upper angle. A 
subglobose, almost sessile avicularium articulated on the outer border of each zocecium, 
close to the bottom. 
Habitat. — Station 323, lat. 35° 39' S., long. 50° 47' W., 1900 fathoms, blue mud. 
Station 332, lat. 37° 29' S., long. 27° 31' W., 2200 fathoms, Globigerina ooze. 
(ZOOL. CHALL. EXP. — PART XXX. — 1884 ) Gg 6 
