108 
TUBULIPORA OBELIA. Encrusting, calcareous, 
herent throughout; cells tubulous, disposed in a radiating 
manner, generally semi-circular. 
Tubulipora obelia, Johnston’s Brit. Zoopb., p. 269, pi. 
figs. 7 and 8. 
Hab. On stones and shells from deep water, commo”* 
from the Ram Head to the Deadman. 
This is entirely an encrusting species. It is circumscribed 
in its base, and semi-transparent. The tubes are distal’ 
recumbent, tubulous, and radiating from several centres, wi ‘ 
semi-transparent inter-tubular spaces. The tubes are » 10 ’ 
commonly recumbent, as just described, but differ in the^ 
appearances; sometimes they are erect, at others sen"' 
erect, and again either prominent or immersed ; and in so" 1 
specimens all these varieties occur together. 
TUBULIPORA HYALIN A. Encrusting, semi-transpa- 
rent, membrano-calcareous ; cells distant from each otb er j 
tubular, erect, arranged in one or two circular rows rou® 
a plain centre; apertures, unarmed and frosted. PI. 
%• 6 - | 
Tubulipora hyalina, 9lh Annual Report of the R°J 
Cornwall Polytechnic Society, p. 73. 
Hab. On Fucus palmatus, rare. Polperro. 
This small species encrusts the margins of sea-weed 
patches of about the diameter of a pea. The tubes * j 
distant, erect, immersed in the surrounding structure, 
equal diameter throughout, and arranged in one or two ro 
round a plain centre; sometimes there are a few cells 
regularly scattered in the centre, but separated from 
external set by a plain surface. The apertures are even, ^ 
armed, and of a milky appearance. In the Report ol ^ 
Royal Cornwall Polytechnic Society, I have refered ' ^ 
species to the Berenicea hyalina of Fleming and John-' 
though I had doubts of its correctness; since then the > :l 
of these Gentlemen has informed me that his species I s . j- 0 
a Tubulipora; this therefore is a new species; the 9 l ,ct [i ,| 
name of Hyalina is retained as descriptive of it* g e,lt 
appearance. 
DISCOPORA. Larmarck. . 
Generic Character : Polypidom calcareous, adherent tliro' 1 ^^ 
out; the base a circumscribed crust ; the cells coales° 
indistinctly quincuncia), tubular, erect, with a ro "J J< , | )t ,s 
tulous terminal aperture without an operculum- Bo 1 
ascidian. 
