146 
Z. HYDROIDA. 
Plumularia, 
Fucoides setis minimis indivisis constans, Raii, Syn. i. 39, no. 7. tab. 2, fig. 2. 
lit. a, (injured and deprived of the pinnae.)— — Sea Bristles, Ellis, Corail. 
19, no. 16, pi. 11. fig. a. A Sertularia pinnata, Lin. Syst. 1312. 
Ellis and Soland. Zooph. 46. Berk. Syn. i. 219. Turt. Gmel. iv. 
683. Turt. Brit. Faun. 215. Stew. Elem. ii. 446. Bose, Vers, iii. 118. 
Aglaophenia pinnata, Lamour. Cor. Flex. 172. Corall. 76. 
Plumularia pinnata, Lam. Anim. s. Vert. ii. 127. 2de edit. ii. 164. 
Risso, L’Europ. merid. v. 313. Johnston, Trans. Newc. Soc. ii. 260, 
and in Mag. Nat. Hist. vi. 498 La P. pinnee, Blainv. Actinolog. 
477. 
ffab. On shells, stones and other corallines in deep water. “ In 
littore maris pone Sheerness,” D. Dillenius. At Brightelmstone and 
Whitstable, Ellis. Scarborough, Mr Bean. Cullercoats, Northum- 
berland, Mr J. Alder , Common in Berwick Bay, G. J. Frith of 
Forth, Dr Coldstream . Cork Harbour, J. V. Thompson , Esq. 
In general about one inch and a half, but sometimes attains the 
height of four inches, very delicate, simple, plumous, white, and 
pretty. The rachis is compressed, straight, jointed, the internodes 
about six times longer than their diameter, and each giving origin 
to three pinnae, in which character I find an invariable and ready dis- 
tinction between this and the following species. There is a minute 
tooth-like spine, only visible under the microscope, between the cells, 
which are perfectly transparent, and admit a distinct view of the po- 
lypes. These have a reddish body and numerous tentacula. The vesi- 
cles are rarely produced, but then profusely, and the specimens on 
which I have seen them have lost almost all their polypiferous pinnae. 
At the base of the remnants they occur clustered, and are pear-shaped 
with an aperture cut into a circle of spinous teeth, or, as Ellis ex- 
presses it, “ the tops of the ovaries are divided like a coronet.” 
5. P. setacea, pinnate , the pinnee alternate , one originating 
at each ringed joint of the rachis ; cells very remote , campanulate , 
with an even margin ; vesicles elliptical , smooth . Ellis. 
Plate XVIII. Fig. 3—5. 
Corallina setacea, Ellis, Corail. tab. 38, fig. 4 Sertularia pinnata $, 
Lin. Syst. 1312 S. setacea, Pall. Elench. 148. Ellis and Soland. 
Zoopb. 47. Turt. Gmel. iv. 683. Wern. Mem. i. 564. Turt. Brit. 
Faun. 216. Stew. Elem. ii. 446. Bose, Vers, iii. 119. Hogg's Stock. 
33. Lister in Phil. Trans, an. 1834, 371, pi. 8, fig. 4, but the vesicles 
so eminent a man ; for his life I may refer the reader to Pulteney’s Sketches 
v. ii. p. 154, &c. ; Thomson’s Hist. Roy. Society, p. 26 ; and Brewster’s Edin. 
Encyclopaedia, v. vii. p. 742 ; a good article contributed by my worthy friend Dr 
Neill. Haller’s notice of his friend is short, but interesting. Bib. Bot. v. ii. p. 
124. 
