200 
THE VOYAGE OF H.M.S. CHALLENGER. 
with, radiating furrows. Very numerous, interspersed, immersed avicularia, lying in all 
positions and of very various sizes, with a broad short mandible, much contracted at the 
base. 
Habitat. — Station 320, lat. 37° 17' S., long. 53° 52' W., 600 fathoms, green sand. 
(17) Cellepora solida, n. sp. (PI. XXIX. fig. 12). 
Character. — Zoarium ramose or globate, very irregular ; in the older portions the 
zooecia are, as it were, all fused together and coated with a porcellanous deposit, so that 
all trace of openings is lost. Zooecia (younger) barrel-shaped, wide above. Orifice quad- 
rangular, border entire ; the zocecium rises behind the mouth into an obtuse, conical 
process, usually presenting a small avicularium, with a triangular mandible, on the 
anterior aspect. In front of the mouth is a much larger, rounded, tumid prominence, on 
which are, occasionally, placed a few very minute, circular avicularia, also with an obtuse 
triangular mandible. Occasional large, interspersed avicularia (fig. 12a), with a broad 
short spatulate mandible. Operculum suborbicular about O^Ol x '0095. 
Habitat. — Station 160, lat. 42° 42' S., long. 134° 10' E., 2600 fathoms, red clay. 
The entire growth is solid and has a porcellanous aspect, and in habit bears a strong 
resemblance to Celleporaria polythele, Manzoni, Brioz. fossil, d. Miocene d’Austr. ed 
Ungh., p. 4. pi. i. fig. 3. 
(18) Cellepora simonensis , n. sp. d (PL XXIX. fig. 9, and PI. XXXVI. fig. 8). 
Character. — Zoarium branched or massive and irregular ; surface uneven, nodulated 
or papillose. Zooecia deeply immersed and ventricose, with a row of punctures round the 
border, and sometimes sparsely punctured all over. Orifice clithridiate, peristome thick ; 
in the older stage annular or shortly tubular. An obtuse avicularian process on one side 
close below the orifice, with a broadly triangular mandible, pointing upwards. Sometimes 
interspersed minute immersed avicularia with a spatulate mandible. 
Habitat. — Simon’s Bay, Cape of Good Hope. 
The operculum is of the same shape as the orifice, and has a pyriform thickening on 
each side (PI. XXIX. fig. 9a). The interspersed avicularia in the older parts of the 
zoarium appear to be vicarious, i.e., transformed zooecia of small size. 
(19) Cellepora pustulata, n. sp. (PI. XXVIII. fig. 8). 
Character. — Zoarium cylindrical, irregularly branched ; branches slightly tapering. 
Zooecia in the younger portions, distinct, ventricose; walls entire, uneven. Orifice clith- 
