REPORT ON THE POLYZOA. 
159 
into a sort of lip overhanging the orifice. Surface very closely and finely punctured. 
Zooecia about 0 //, 025 to '03 wide. Orifice O^'OIS. Operculum semicircular 0"01 x '008. 
Habitat . — Off Honoruru, Sandwich Islands, 20 to 40 fathoms. 
From its size, colour, and conformation this form is one of the most magnificent of 
the Polyzoa, Although of such large dimensions, it is covered with an extremely thin 
and fugitive epitheca of a deep purplish-brown hue, (of a much deeper tint than that of 
Mucroneila castanea ), but the colour is in great part due to that of the polypides them- 
selves. Amongst its most striking and conspicuous characters is the ocecium, of a beautiful 
pearly aspect and sculptured all over, except the lip-like prolongation interiorly, and fur- 
nished with minute hexagonal pores. The marginal spines are represented, in the specimens 
observed, only by what appears to be the basal joint ; they are probably when present of 
large size. From the figure it might be supposed that the lateral jmojections, at the 
lower part of the orifice, were internal articular denticles, but in reality they as well 
as the central broad mucro are, ab origins , processes of the thin peristome itself. 
(c) Adnate (lepralian). 
(9) Mucroneila ( Pliylactella V) canalifera , n. sp. (PI. XXII. fig. 2). 
Lepralia mangnevilla , Bk., Zoopliyt., Quart. Journ. Micr. Sci., N. S., vol. xiii. p. 284, pi. xxxi. 
fig. 5 ( nec Audouin). 
Character. — Zooecia erect, very distinct, ventricose, surface varnished and very 
finely punctate or frosted. Orifice suborbicular ; peristome produced in front into a 
wide spout-like process ; six long, tapering, oral spines above and on the sides. Ooecia 
small, recumbent, not punctured. 
Habitat. — Station 75, lat. 38° 38' N., long. 28° 28' W., 450 fathoms, sand. 
[Madeira, J. Y. J]. 
This form differs from Lepralia ( Pliylactella ) labrosa in the absence of an internal 
denticle, and from Lepralia ( Pliylactella ) collaris in the presence of the oral spines and 
the absence of puncturation on the ocecium. 
(10) Mucroneila tricuspis, Hincks (PI. XXII. fig. 3). 
Mucroneila tricuspis, Hincks, Ann. and Mag. Nat. Hist., ser. 5, vol. viii., 1881, p. 125, pi. iii. 
fig. 1. 
Character . — Zoarium adnate. Zooecia disposed quincuncially but more or less 
in linear series, running in different directions ; deeply immersed, except at the 
growing edge, with the oral portion produced. Primary orifice transversely elliptical^ 
