REPORT ON THE POLYZOA. 
125 
(21) Reteporci margaritacea, n. sp. (PL XXVII. fig. 2). 
Character. — Zoarium foliaceous, expanded. Fenestrse elliptical, irregular in size and 
form, about the same width as the trabecuhe. Dorsal surface finely verrucose, glistening, 
pearly. Zocecia deeply immersed, outline imperceptible, surface 
warty. Orifice deeply immersed, elliptical from side to side; labial 
fissure sublateral, short and wide. Peristome slightly raised all 
round, posteriorly pectinate, with four or five obtuse teeth, upon 
which are articulated short slender pointed spines. Ocecia incon- 
spicuous. Anterior avicularia in front of almost every zooecium, on 
one side close below the labial fissure or pore ; large and prominent, 
with a much curved slender acute mandible pointing horizontally to 
one side (fig. 2a) ; the edge of the avicularian cup serrated. Besides 
these, when the larger ones are absent, a minute avicularium on one side close below the 
suboral pore (fig. 26). No dorsal avicularia. 
Habitat. — Station 176, lat. 18° 30' S., long. 173° 52' E., 1450 fathoms, Globigerina 
ooze. 
Unfortunately only a single specimen of this interesting form was contained in the 
gathering at this Station. The width of the specimen is about 0"'75. It is convex on 
the anterior side, and to the naked eye is chiefly remarkable for the irregular size and 
disposition of the fenestrse. The verrucose, beautifully pearly, glistening surface is 
also distinctive, as well as the size and position of the anterior avicularia, and the form of 
the mandible, which is remarkable for its long curvature. 
(22) Retepora jacksoniensis, n. sp. (PI. XXVII. fig. 4). 
Character. — Zoarium infundibuliform, flexuose. Fenestrse oval, narrow, pointed at 
each end, irregular in size. Zocecia elongated, rhomboidal, flattened 
in front. Peristome much raised on the sides and the front, bifid or 
trifid on each side. Labial fissure wide and shallow, anterior surface 
smooth, with a strongly raised septal line. Dorsal surface wrinkled, 
with irregular wavy vibices. Ooecia inconspicuous. Anterior 
avicularia sparse, placed rather to one side of the upper part of the 
front ; in the younger zocecia almost level with the surface, mandible 
acute, pointing directly downwards ; in the older zooecia the 
avicularium forms a prominent central rostrum (fig. 46), in which 
the mandible of the same shape, and not much larger, points 
directly forwards. No dorsal avicularia, but occasionally one like 
the anterior at the lower angle of a fenestra. 
Habitat. — Port Jackson, 2 to 10 fathoms, mud. 
Fig. 37. — Retepora 
jacksoniensis. 
Fig. 36. — Retepora 
margaritacea. 
