96 ALDER, ON NEW BRITISH POLYZOA. 
the C. cervicornis of British authors, the propriety of remoy- 
ing which is doubtful. The only branched species mentioned 
by Dr. Johnston, now generally retained in this genus, is C. 
ramulosa. As one or two species have been confounded with 
this, it will be necessary to re-define it. 
CELLEPORA RAMULOSA, Linn. (PI. II, fig. 1.) 
Polyzoary erect, white or yellowish, rather glossy, branch- 
ing dichotomously, and arising generally from a broadish 
spreading base, the branches cylindrical, and tapering very 
slightly. Cells prominent, ventricose, rather irregularly 
heaped, smooth, and occasionally punctured round the sides ; 
the apertures smallish, nearly circular, with a strong project- 
ing rostrum below, terminating generally in a sharp point, 
and with an avicularium placed on one side. Ovicells small- 
ish, subglobose, rather broader than long, smooth, and imper- 
forate. Height sometimes reaching to three inches; lateral 
expansion variable, but often exceeding the height. Breadth 
of branches about one and a half tenths. 
Cellepora ramulosa, Flem., ‘ Brit. Anim.,’ 582; Johns., in 
‘Newc. Nat. Hist. Trans.,’ v. ii, p. 267, t. 12, figs. 3, 4; 
‘Brit. Zooph.,’? 2nd Ed., p. 296, t. 52, figs. 4,5; Couch, 
‘Cornish Fauna,’ pt. ii, p. 110, t. 20, fig. 2; Busk, ‘ Catal.,’ 
p. 87, t. 109, fig. 1, 2, 3, (young ?). 
This species may generally be known by its roughened and 
spinous appearance. Large specimens are much branched; 
the branches are round, tapering a little towards the apex, 
- where, occasionally, they are slightly flattened. Professor 
Busk says* that the ovicells are punctured, but this, I think, 
is a mistake, as, according to my observation, they are 
smooth and imperforate, and in that respect are well distin- 
guished from the following. 
- CELLEPORA DIcHoToMA, Hincks, (Pl. II, figs. 2, 3, 4.) 
This species has been described by the Rev. T. Hincks, in 
his ‘Catalogue of the Zoophytes of South Devon and Corn- 
wall. It is distinguished from C. ramulosa by its less spinous 
surface, the rostrum below the aperture being blunt, and, ex- 
cepting in young cells, very slightly projecting. The stem is 
slender below, and scarcely expanded at the base, becoming 
* © Fossil Polyzoa of the Crag,’ p. 58. 
