ZOOPHYTOLOGY. 
247 
3. C. gracill'ma^ n. sp. Alder (p. 39, PI. IV, figs. 5, 6). 
Stem erect, compound, sub-unilaterally brauclied ; cells very slender, long, 
tubular, thin, set on loosely twisted pedicles of about two whorls \ aperture 
entire. Height, 1 inch. 
Hab. On shells and zoophytes from deep water. 
A very similar if liot identical species occurs in Bass Strait 
(Busk). 
3. Grammaria^ Stimpson. 
" Polypidom rectilinear, elongated, cylindrical, composed of aggregated 
tubes, generally without branches, which, when they occur, are of the same 
character as that from which they spring. Cells arranged on all sides, in 
more or less regular and equidistant longitudinal rows, giving a section of 
the stem a star-like appearance." 
G. ramosa^ u. sp. Alder (p. 40, PI. IV, figs. 1 — 4). 
Polypary stout, horn-coloured, irregularly branched ; branches arising from 
a constricted base ; cells cylindrical, bending outwards to a distance nearly 
equal to the width of the stem, with an even margin, behind which they are 
frequently annulated with one or two lines of growth ; they are set in about 
four longitudinal rows, the adjoining ceils alternating and the opposite cells 
nearly in a line with each other. Height, I — 2 inches. 
Hab. Deep water ; rather rare. 
II. POLYZOA. 
Earn . MEMBiiANii-oEiDib; . 
I. Memb7'anipora, Blainville. 
As considerable confusion and obscurity involve the various 
British species of Membranipora, a genus to which Mr. Alder 
appears to have paid considerable attention_, and which he 
has in great measure now cleared up^ it will be advantageous 
to notice his arrangement of the several species belonging 
to it which have occurred to his observation. These are — 
1. M. memhranacea^ Linn. Flustra memhranacea^ Johust. M. membra- 
nacea, Busk. Cat., p. 56, pi. Ixviii, fig. 2. 
2. M. pilosa, Linn,, Jolmst., Busk. 
3. M, lifieata, Linn. Alder (p. 53, PI. VIII, figs. 1, la). 
Cells oval ; the margin with four or five spines on each side, bending in- 
wards, generally rather slender and not flattened on the sides. Ovicapsule 
large, galeate, slightly frosted, with an arched rib near the top. Avicularia 
subsessile, or a little elevated, situated on one or both sides of the ovicapsule, 
more rarely at the top, and sometimes at the bottom of the cell. 
Flustra Uneata^ Linn., Johnston. 
Membranipora lineafa^ Busk. Cat., p. 58. 
4. M. spinifera, Johnst. Alder (p. 53, PI. VIII, figs. 2, 2 a). 
Cells oblong-oval ; the margin with numerous stout, linear, or subclavate 
spines, about seven on each side, erect or leaning inwards. Ovicapsule shal- 
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