Serialaria. ZOOPHYTA. SERTULARIADiE. 547 



slightly attenuated at the summit. Dr Grant has observed only two ova in 

 each, " large, of a light brown colour, semiopaque, nearly spherical, composed 

 of minute transparent granules, ciliated on the surface, and distinctly irrita- 

 ble." 



185. P. setacea. — Stem pinnated ; branches alternate, a lit- 

 tle bent ; cells minute, distant. 



Corallina setacea, Ellis, Cor. 19. t. xi. f. 16., and t. xxxviii. f. 4 — Ser- 



tularia pinnata, Linn. Syst. 1312 — S. set. Pall. El. 148 — Plum. set. 



Lamarck, Hist. ii. 129 — Aglaophenia set. Lamour. Cor. Flex. 172 — On 



fuci in deep water. 



Height about 3 inches ; stem simple, slender ; branches alternate, with a 



joint between each pair; cells short, distant, and slightly pointed externally ; 



vesicles oblong, subcampanulate, with spinous summits, the spines 10 to 12 



in number, base narrow, attached to the stem or at the upper side of the base 



of the branches. 



** Stems compound. 



186. P. myriophyllum. — Stem slightly divided, pinnated, 



branches recurved ; cells cylindrical, adherent, supported at the 



base by a short obsolete spinous process. 



Pheasant's Tail, Coralline, Ellis, Cor. 14. t. viii — Sertularia myr. Linn. 

 Syst. i. 1309. Pall. EL 155 — P. myr. Lamarck, Hist. ii. 124 — Agla- 

 ophenia myr. Lamour. Cor. Flex. 168 — On the English and Irish coast, 

 in deep water. 



Height nearly a foot ; stem composed of tubes, closely adhering together ; 

 at intervals swollen, marking, probably, the stages of growth; branches sim- 

 ple, alternate, curved ; cells with a joint between each, longitudinal, with an 

 even mouth. 



187. F.jrntescens. — Stem slightly divided, pinnated; branches 



bending upwards ; cells cylindrical, adherent. 



Sert. frut. Sol. Ellis's Zooph. 55. t. vi. f. a — S. gorgonia, Pall. El. 158. (in 

 part.) — Aglaophenia frut. Lamour. Cor. Flex. 175.— Scarborough, rare. 



Height several inches ; stem black and hard ; branches alternate ; the cells 

 are narrower, and more remote than in the preceding species and are simple 

 at the base. 



Gen. LXVIII. SERIALARIA.— Cells cylindrical, paral- 

 lel, adjacent, in linear masses. 



188. S. Icndigera. — Stem jointed, masses of cells distant, the 

 margins united. 



Nit. Coralline, Ellis, Cor. 27- t. xv. f. 24 — Sertularia lend. Linn. Syst. 

 i. 1311. Pallas, El. 124 — Serai, lind. Lamarck, Hist. ii. 130 — Amathia 



lend. Lamour. Cor. Flex. 159 On fuci beyond low-water mark. 



Height about an inch ; fine, dichotomously divided ; cells numerous, to- 

 wards the upper part of each joint, the upper ones shortest. 



m m 2 



