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THE VOYAGE OF H.M.S. CHALLENGER. 
becomes very much elevated on the sides, forming a wide spout-like subtubular projection. 
Occasionally a small avicularium on one side at the upper part of the front with an acute 
triangular mandible pointing upwards and inwards. The fertile cells about half the size 
of the sterile ones, and seated on the front of the larger cells; the ocecium, of small size 
and globular in form, is recumbent, and leans over to one side, so as not to interfere with 
the orifice of the supporting zooecium ; its surface is finely punctured, and the anterior 
lip of the opening much thickened and projecting. 
Habitat. — Off Honoruru, Sandwich Islands, 20 to 40 fathoms. Station 313, lat. 52° 
20' S., long. 67° 39' W., 55 fathoms, sand. 
The peculiar situation of the fertile cells on the front of one of the sterile kind is a 
very remarkable feature ; the mouth of these smaller zocecia is formed exactly in the 
same way as in the others. 
(4) Smittia transversa (PI. XVIII. fig. 7). 
Character. — Zoarium expanded, foliaceous. Zocecia elongated, pyriform, truncate 
below, rather flattened in front. Surface finely granular, a row of pores round the entire 
border. Mouth orbicular, a small internal median denticle, and on the lower border in 
front a small immersed avicularium of an oval form and placed transversely. Dorsal 
surface entire, porcellanous, wall thick. Interzooecial pores, 10 to 12, very minute. 
Habitat. — Station 163 a, off Twofold Bay, 150 fathoms, green mud. 
Bears some resemblance to Lepralia reticulata in one or other of its varieties ; and 
in the transverse position of the suboral avicularium is like Smittia ciffinis, Hincks. 
(5) Smittia marionensis, Busk (PI. XVIII. fig. 6). 
Lepralia marionensis, Bk., Brit. Mus. Cat. p. 67, pi. xcvi. figs. 1 and 2. 
Character. — Zoarium foliaceous, expanded, flexuose, unattached. Zooecia ovate, 
ventricose, no septal ridges ; wall thin, punctured, punctures wide apart. Primary 
orifice suborbicular, with a small almost circular median avicularium on the lower 
border, and a conical much reclined internal denticle ; peristome thickened and elevated ; 
afterwards forming an elevated lip on each side, which is continued around a large suboral 
avicularium with a duck-bill shaped obtuse mandible pointing vertically downwards. 
Ooecium distinct, hemispherical, surface smooth, with several more or less triangular 
converging pores on the front; each pore surrounded with a thickened border. Posterior 
surface entire, opaque, almost porcellanous. 
Habitat. — Prince Edward Island, 80 to 150 fathoms. Station 149d, Royal Sound, 
Kerguelen Island, 28 fathoms, volcanic mud. 
[Marion Island, 80 fathoms, Hooker]. 
