Thhiaeia, ZOOPHYTA. SERTULARIAD^. 545 
forming a shoulder on the upper side ; vesicles ovate, with a narrow base, and 
a contracted subtubular orifice. 
1 76. D. Evaiisii. — Branches opposite ; cells opposite, short. 
Sol. Ellis, Zooph. 59. — Found at Yarmouth, by Mr Evans. 
Height 2 inches ; very slender ; of a bright yellow colour ; vesicles “ arise 
from opposite branches, which proceed from the creeping adhering tube, lo- 
bated, and the lobes are placed opposite to one another.” 
177. pmnata. — Branches dusky, bifarious, alternate; cells 
opposite, tubular, and slightly diverging. 
Bast. op. 1. 1. i. f. 6 — Sertularia pin. Pall. El. 136 — S. fuscescens, Turt. 
Brit. Fauna, 213 — On oyster-beds, common. 
Height 2 or 3 inches ; stems arising from irregular tubular roots ; branches 
rather stiff ; cells narrow, where adhering to the stem ; summit free, tubular, 
but less divergent than in S. rosacea. According to PaUas, the cells incline to 
one side (a character I have failed to observe), and from which side the in- 
versely conical vesicles, with their tubular ciliated summits, take their rise. 
178. D. mgr a. — Stem ascending, black, pinnated, compress- 
ed ; cells opposite, minute. 
Pall. El. 135. Jameson^ Wern. Mem. 565.— Bare. 
Height 4 inches ; branches rounded, linear, depressed, slender at the base ; 
cells subtubular, minute ; vesicles on one side of the stem, subquadrangular. 
— ^This species is stated by Pallas as occurring at Cornwall ; and, according to 
Professor Jameson, it has been found on the Aberdeenshire coast, by that il- 
lustrious botanist Bobert Brown, Esq. 
Gen. LXV. THUI ARIA.— Cells thin, and imbedded in the 
substance of the stem and branches. 
179. T. Tliuia. — Stem waved, branches dichotomously divid- 
ed ; cells adpressed, or imbedded in the sides of the branches. 
Planta marina equisiti facie, Sihh. Scot. 111.^55. t. xii. f. 1 — Bottle-brush 
coralline, Ellis^ Cor. 10. t. v. f. 9 — Sertularia thuia, Linn. Syst. i. 1308. 
Pall. El. 140. Lamour. Cor. Flex. 193 — On oyster-beds, common. 
Height upwards of a foot ; stem with alternate branches, w^hich, falling off 
on the lower part, give it a zig-zag appearance ; divisions of the branches 
slightly tapering ; cells compressed, wide at the base, slightly tapering, short, 
with a small orifice ; vesicles ovate, on a narrow short stalk, with a rounded 
summit, having a subtubular mouth. 
180. T. articulata. — Stem pinnated, with simple alternate 
branches ; cells adpressed, subalternate. 
Sea Speenwort, Ellis^ Cor. ii. t. vi — Sertularia art. Pall. El. 137 — S. lon - 
chitis, Sol. Ell. Zooph. 42 — S. lichenastrum, Lamour. Cor. Flex. 194. 
— On stones in deep water. 
Height 3 inches ; stem straight, erect, jointed at intervals ; branches stiff, 
a little depressed ; cells compressed, broad at the base, a little narrower to- 
wards the slightly tmncated orifice ; vesicles on one side of the stem, ovate, 
subrugose. 
VOL. I. 
M m 
