EEPOET ON THE POLYZOA. 
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2. Adeonella, n. gen. 
(1) Adeonella poly morpha, n. sp. (PL XXL figs, la, 2a, and 3). 
(2) Adeonella platalea, n. sp. (Pl. XXL fig. 4). 
(3) Adeonella intricaria, n. sp. (Pl. XXI. fig. 2). 
(4) Adeonella atlantica, n. sp. (Pl. XX. fig. 7). 
(5) Adeonella regularis, n. sp. (Pl. XX. fig. 2). 
(6) Adeonella distoma, Busk. 
(7) Adeonella distoma, yar. imperforata ? 
(8) Adeonella pectinata, n. sp. (woodcut). 
1. Adeona, Lamouroux. 
Adeona, Lamx.; Lamk.; Kirch. ; Auctt. 
Didyoporcc, Macgilliv., Nat. Hist. Viet., Dec. v. p. 37. 
Character . — Zoarium erect, foliaceous, expanded, flabellate or lobate, fenestrate or 
entire, usually supported on a flexible or subflexible, cliitino-calcareous, usually jointed 
stem, composed of radical tubes encrusted with calcareous matter, and attached by 
spreading radical fibres. If without a stem, generally attached to a flexible support. 
1. Adeona appendiculata, n. sp. (Pl. XXXIII. fig. 6, woodcuts 47 and 48). 
Character. — Zoarium light buff in colour ; in the form of a simple flat circular or sub- 
cordiform expansion about 3" in diameter, supported on a solid calcareous stem (probably 
continued into an articulated peduncle). Fenestrse circular, nearly as wide as the 
interspaces. Zooecial cells oval, convex in front, with a large deep frontal fossa surrounded 
with a thick, rounded, smooth border ; in the fossa a large circular pore at the lower 
part, and a very large avicularium with a spear-shaped mandible pointing upwards and 
rising to the side of the orifice. Orifice irregularly elliptical, usually rendered oblique 
by the presence of the avicularium. A single or double row of punctures round the 
border of the cell, and a few sparsely distributed on the front. Ooecial cells larger, 
orifice semicircular with a straight lower border. Avicularian cells of two kinds, one 
marginal around the fenestrse, with long curved pointed mandible, and another of 
minute size interspaced among the zooecia with miniature mandibles, like those on 
the zooecial cells. Opercula of the zooecial cells inapparent ; of the ooecial, very 
indistinct. 
Habitat. — Station 163a, off Twofold Bay, 150 fathoms, green mud. 
The only other species, and with which the present can, from its habit, be confounded, is 
the Adeona grisea of Mr. Macgillivray, which may or may not be the same as the Adeona 
grisea of Lamouroux and Kirchenpauer, though the latter at any rate may be doubtful. 
Mr. Macgillivray’s figure ( loc . cit., Dec. vii. pl. lxvi. fig. l), in the general habit bears 
