16 
Thoa Haleeina, Latnouroux’s Cor. Flex., p. 211. Johnston s 
Brit. Zooph., p. 119, pi. 0. 
Hab. On stones and shells, especially the Pinna Inge”**’ 
from deep water west of the Eddy stone to Falmout > 
common. 
This species grows to the height of eleven inches, and 
four to eleven inches in breadth. In young specimens, tU _ 
polypidom is of a light horn colour, which in the older tor 11 ® 
to a dark brown. The polypidom is arborescent, n>° C j 
branched, aDd rooted by numerous Gbres interwoven 811 
matted with each other. The trunk is formed of numero®’ 
sub-parallel tubes agglutinated together. The branches ® r 
brown, and when dry very brittle; they are irregular 
given off; the pinnas are alternate, and both erecto-pate® ' 
Here for the first time the polypes have cells, into wb ,C j 
they can retire for shelter; they do not, however aft 0 *' 
such complete shelter as in the following genera. The «?•* 
are alternate, tubular, bi-articulate and with plain aperture ' 
The Ovarian vesicles aro scattered over every part of 'J® 
polypidom, but are most abundant about the axilloe of 
pinnte ; they are pedunculated, smooth, with a long necks ®® 
edges round them like a jug. 
T. MURICATA. Very rigid, irregularly branched, bra” 
ches semi-erect and spreading ; cells alternate, visible 
the younger branches only ; vesicle small, round, a ® 
prickly, cup shaped, with an even aperture, separated ft’ 0 * 
the stem by a joint. 
Sertularia Muricata, Ellis and Solander’s Zooph., p. 
pi. 7, figs. 3 and 4. Turton’s Lin., vol. 4, p. 681. Steward’ 
Elem., vol. 2, p. 445. Laomedea Muricata, Lamouroii* 
Cor. Flex., p. 209. Thoa Muricata, Johnston’s Brit. Zoop®'’ 
p. 121, pi. vii., figs. 3, 4. 
Hab. On a shell from deep water, off Mevagissey ; T^ 6 ' 
This rare and stout species rises from a fibrous and spo®»{ 
base to the height of three inches. It is very stiff, irrflr' 1 ! 
larly branched, of a light dull brown colour, and is Gontpn 5 ^ 
of a great, number of small tubes very irregularly twisted 0 
each other. The branches are numerous, irregular tubol^j 
The cells are minute and frequently absent, being destroy 1 ^ 
by the action of the sea. The vesicles are clustered, r o®® 
and beset with prickles. 
SERTULARIA, Limixus. 
Generic Character: Polypidoms rooted, plant-like, varion 5 ^ 
branched, divisions or branches formed of a single tn®j 3 
divided at regular intervals by imperfect septa; c ® c j 
paired or arranged in two opposite rows, sessile, dist'® 
