Thuiaeia. ZOOPHYTA. SERTULARIAD^. 515 



forming a shoulder on the upper side ; vesicles ovate, with a narrow hase, and 

 a contracted subtubular orifice. 



176. D. Evansii. — 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. D. pinnata. — 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 Pallas, 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. nigra. — Stem ascending, black, pinnated, compress- 

 ed ; cells opposite, minute. 



Pall. El. 135. Jameson, Wem. Mem. 565 — Rare. 

 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 Robert Brown, Esq. 



Gen. LXV. THUI ARIA.— Cells thin, and imbedded in the 

 substance of the stem and branches. 



179. T. Thuia. — Stem waved, branches dichotomously divid- 

 ed ; cells adpressed, or imbedded in the sides of the branches. 



Planta marina equisiti facie, Sibb. 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, which, 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 truncated orifice ; vesicles on one side of the stem, ovate, 



subrugose. 



vol. i. Mm 



