REPORT ON THE POLYZOA. 
43 
calices, Auctt.) are seated on the upper end of slender tubes or pedicels, which are pro- 
duced into a single or double point on one side at the top ; at its base the pedicel dilates 
into a thick barrel-shaped cylinder (PL IX. fig. 7), which is covered by a transparent, 
ringed, chitinous envelope (PI. X. fig. 1), lined with a strong muscular layer, the cavity 
being occupied by a very delicate fibro-cellular tissue (PI. IX. fig. 14). The chitinous 
pedicels have four more or less regular longitudinal series of funnel-shaped perforations. 
These polypiferous peduncles are seated in a cup-shaped hollow, and attached by a much 
restricted termination in a spiral direction around the upright stems, communication with 
the interior of which is maintained through a fine funnel-shaped orifice (PI. XI. figs. 12, 
13). The polypides are of the usual pedicelline character, and have a very short flexible 
stalk, which is attached just within the upper edge of the chitinous pedicels, and when 
young is continuous with the inner cellular tissue ; when mature the polypides appear to 
be quite cut off from the pedicels on which they are placed, and from which they bud 
in succession (PI. IX. fig. 5). The tentacles vary in number from twenty in a bud to 
twenty-six or twenty-eight in an adult, and are arranged more or less bilaterally and 
symmetrically. The pedicels and stems are of a bright light brown colour usually ; the 
stems turning nearly black when old. The polypides are white and the barrels white or 
nearly so, the transparent chitinous envelope being so thin that the white inner layer 
shows through. 
The total length of the calyx and peduncle is 3 *5 to 3 ’8 mm. The polypide 
measuring about 0’65 x 0 5 mm., the pedicel 2'3 x 0‘07 mm., and the barrel 0‘75 x 0'5 mm. 
Habitat . — Station 1G3a, off Twofold Bay, 150 fathoms. 
[Port Philip Heads.] 
The arborescent growth of this beautiful species distinguishes it at once from all 
other known Pedicelline forms, but the rest of its structure leaves no doubt as to its 
belonging to that order. 
At first sight it is difficult to observe that the tentacles are not arranged in a 
perfectly regular and continuous circle, but here and there indications may be noticed 
that a wider space does occur between two at ojoposite sides of the circumference, viz., at 
the two ends of the symmetrical plane of the animal ; the bilateral arrangement is most 
clearly seen in a young budding Polypide (PI. X. fig. 2) which appears closely to resemble 
the figures given by Hatschek 1 in his paper on Pedicellina echinata, and also the figure 
and description by Salensky. 2 The buds arise in succession spirally and somewhat in 
pairs (PI. X. fig. 1) round the growing ends of the chitinous stems and branches. Fresh 
polypides also bud from the ends of the pedicels after others have died and dropped off ; 
that this also occurs in Pedicellina has been noticed and described by Salensky, 3 and 
1 Zeitschr. f. wiss. Zool., Bd. xxix. pi. xxx. figs. 39, 40, 45. 2 Ann. d. Sci. Nat., ser. 6, t. v. p. 36, pi. xv. fig. 36, 
3 Loc. cit., pp. 30, 31. 
