REPORT ON THE POLYZOA. 
151 
Habitat. — Off Bahia, 10 to 20 fathoms. 
[The only specimen of this apparently undescribed species is a small dead fragment, 
containing no chitinous parts, and otherwise in bad condition, so that it is doubtful 
whether there really is an internal denticle ; but the median descending avicularium, of 
which I cannot see more than one in the entire specimen, renders it almost certain that 
the form belongs to Smittia, or is closely allied to it.] 
( b ) Unilaminar, erect or crustaceous, unattached (hemescharan). 
(2) Smittia smittiana, n. sp. (PI. XVII. fig. 3). 
Character. — Zoarium quite unattached, foliaceous, expanded. Zooecia quincuncial, 
elongated oval, or fusiform. Surface uniformly punctured, epitheca thick and white. 
Primary orifice suborbicular, rather wider than high, with two lateral notches in the 
lower lip ; secondary clithridiate, peristome much raised all round, but especially on the 
sides ; a median oral avicularium of circular form, with a short duck-bill shaped mandible, 
deeply seated behind which is an internal rather broad denticle. Ocecium prominent, hemi- 
spherical, with an oval or rather reniform circumscribed area in front, within which are 
usually five converging more or less triangular openings, the borders of which are not 
thickened. The anterior border of the ooecial mouth straight, joining the lateral eleva- 
tions of the peristome on each side. On the dorsal aspect, the zooecia are barrel-shaped 
and imperforate, and the texture of the hind wall is very coarse and thick. Zooecia from 
0"*02 to ‘03 wide x ‘04 to ’06 long. 
Habitat. — Station 320, lat. 37° 17' S., loug. 53° 52' W., 600 fathoms, green sand. 
This beautiful form differs from Smittia lanclsborovii. Johnst. : 1, in the form 
of the zooecia, and in their not being separated by septal ridges; 2, in the size and 
form of the suboral avicularium ; 3, and more especially in the primary conformation 
of the orifice, which in that species has a prominent tooth within the lower lip, with a 
minute denticle on either side of it (Hincks), whilst in Smittia smittiana the lower lip 
presents two small lateral notches separated by a wide portion of the border, which in 
a subsequent stage of development appears to be reduced to a comparatively narrow 
hammer-shaped denticle. 
(3) Smittia marsupialis, n. sp. (PI. XVIII. fig. 1). 
Character. — Zooecia serial, quadrilateral, flattened in front, with the oral portion 
somewhat raised ; wall punctured. Orifice, at first suborbicular, entire, with a broad 
internal median denticle, and two smaller points on the sides ; afterwards the peristome 
