REPORT OJST THE POLYZOA. 
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(2) Cellepora tuberculata, n. sp. (FI. XXVIII. fig. 9, and PI. XXXV. fig. 7). 
Character. — Zoarium a rounded, massive irregularly nodular growth. Zooecia per- 
fectly upright, very deeply immersed below and more or less free above ; often assembled 
in sets of three or four together. Orifice suborbicular or elliptical, about 0 //- 007 wide ; 
a few excessively minute denticles within the lower border. Operculum subtriangular, 
rounded, about 0 // ‘006 in diameter. Pre-oral rostrum small, conical obtuse, most frequently 
represented by a mere transverse tubercle ; on the back of which is a very minute 
avicularium with a semicircular mandible. Ooecium partially recumbent, free, with a 
round pore on each side in front. Interspersed avicularia rare, columnar, vicarious ; 
mandible blunt, triangular ; beak obtuse, not toothed. 
Habitat. — Station 163b, off Port Jackson, 35 fathoms, hard ground. 
The open honey-comb appearance of the surface in this form and the peculiar habit 
(if constant) are at first sight very characteristic. 
(3) Cellepora albirostris, Smitt (PI. XXXIV. fig. 7, and PI. XXXV. fig. 3). 
Discopora albirostris ( forma typica ), Smitt, Florid. Bryoz. pt. ii. p. 70, pi. xii. figs. 234-239 ; 
(nee. Hincks). 
1 Cellepora bispinata, Busk, Brit. Mus. Cat., p. 87, pi. cxx. figs. 1, 2. 
Character. — Zoarium massive, or irregularly lobate; erect, or partially encrusting 
sponges or Fucus. Zooecia (marginal) barrel-shaped, surface pearly, smooth or finely 
granular ; imperforate or with a few punctures round the border. Orifice (primary) 
suborbicular or arcuate; two long, very slender, unarticulated oral spines above; 
rostrum (where fully formed) very long, straight and acuminate, solid with a minute 
avicularium with semicircular mandible on one side of the base, and overhanging a 
wide sinus. On the older zooecia, often a long solid upright acuminate spine, arising 
apparently from the side of the zocecium about the middle of its length. The rostrum is 
often developed into a very thick sub cylindrical process obliquely truncated at the end 
and presenting on the oblique face a large avicularium with a blunt spatulate mandible 
and toothed beak (fig. 7d). A few interspersed immersed retentive avicularia, usually 
placed transversely on the front of a zooecium, and varying greatly in size ; the mandible 
elongated obtuse or subspatulate, the beak simple or rounded. 
Habitat.— Station 151, off Heard Island, 75 fathoms, volcanic mud. 
As Prof. Smitt remarks, the typical Cellepora albirostris in a fresh condition is readily 
recognisable by its greyish-brown colour and blackish-brown operculum. The zooecia, he 
goes on to observe, in the growing edge of the colony are elongated ovate, presenting the 
greatest resemblance to Cellepora bispinata , Brit. Mus. Cat. In this I quite agree with 
(ZOOL. CHALL. EXP. PART XXX. 1884.) Gg 25 
