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THE VOYAGE OF H.M.S. CHALLENGER. 
ate ; afterwards the peristome becomes much thickened and raised (fig. 11 b), so as to conceal 
the primary mouth. Three or four acute curved denticles within the peristome, which in 
this stage is unarmed. In other zocecia the labial sinus becomes fissural, and eventually 
converted more or less completely into a suboral pore, whilst in front the peristome 
forms a prominent tubercular eminence (fig. 1 lc), supporting on the side overlooking the 
fissure a large avicularium, with a rounded triangular mandible and toothed beak. A 
few interspersed avicularia (fig. 11 d,e), on low horizontal eminences, with a spatulate 
retentive mandible often squarely truncated, and bifid beak. Ocecia (fig. 11/), erect 
or subrecumbent, globose; surface finely granular. Opercula semicircular about 
0"-008 x -0035. 
Habitat . — Off Honoruru, Sandwich Islands, 20 to 40 fathoms. 
§§ A encrusting. 
(10) Cellepora apiculata, n. sp. (PI. XXIX. fig. 2, and PI. XXXV. fig. 12). 1 
Character . — Zoarium encrusting, or unilaminar and unattached. Zocecia (at the 
growing edge), ventricose or barrel-shaped, with a granular unpunctured surface. In the 
older portions deeply immersed and very confusedly disposed, varying much also in size. 
Primary orifice semicircular, with a straight entire lower border, and surmounted in the 
earliest stage by two, or more rarely three, long oral spines. Pre-oral rostrum very irregular 
in size and supporting usually on one side a large avicularium with an obtuse serrated 
beak, and a subacute lanceolate or triangular mandible, and usually produced beyond the 
avicularium into a longer or shorter, obtusely apiculate spine. 
Habitat. — Station 163b, off Port Jackson, 35 fathoms, hard ground. 
The extreme irregularity of growth and great diversity in the form and size of the 
pre-oral rostrum, which is sometimes very small, and at others developed into a very large 
avicularian process, render any definite description of this species very difficult. The 
chief points it presents are : 1. The semicircular orifice (about 0"’07 wide), with a straight 
entire lower lip ; 2. The, at first, short and thick hollow rostrum, which afterwards 
becomes produced into an obtuse spine, and on the side of the wider portion, some 
distance above the base, supports on one side a large avicularium with a finely serrated 
beak and rather blunt but elongated mandible ; 3. The presence on the youngest zooecia 
only of two or sometimes three long oral spines, like those in Cellepora bispinata, 
Busk, or Cellepora albirostris, Smitt. 
(11) Cellepora samboangensis, n. sp. (PI. XXX. fig. 7, and PI. XXXV. fig. 10). 
Character. — Zoarium expanded, thick, loosely adnate, surface uneven but not 
distinctly mamillated. Zooecia distinct, very confusedly disposed, obscurely punctured 
1 The figure has unfortunately been taken from a very had specimen, and shows little of the real characters. The 
chitinous parts, however, suffice to distinguish it. 
