146 Z. HYDROIDA. Plumularia. 



Fucoides setis minimis indivisis constans, Rail, Syn. i. 39, no. 7. tab. 2, fig. 2. 



lit. a, (injm-ed and deprived of the pinnte. ) Sea Bristles, jE/fc, Corall. 



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. Bosc, Vers, iii. 118. 



Aglaophenia pinnata, Lamour. Cor. Flex. 172. Corall. 76. 



Plumularia pinnata, Zam. Anim. s. Vert. ii. 127. 2de edit. ii. 164- 

 Eisso, L'Europ. merid. v. 313. Johnston, Trans. Newc See. ii. 260, 



and in Mag. Nat. Hist. vi. 498 La P. pinnee, Blainv. Actinolog. 



477. 

 Hab. 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 on,e 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 

 al)out 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 pinncs alternate, one originating 

 at each ringed joint of the rachis ; cells very remote, campanulate, 

 ivith an even margin ; vesicles elliptical, smooth. Ellis. 

 Plate XVIII. Fig. 3—5. 



Corallina setacea, Ellis, Corall. tab. 38, fig. 4 Sertularia pinnata 0, 



Lin. Syst. 1312 S. setacea, Pall. Elencli. 148. Ellis and Soland. 



Zooph. 47. Turt. Gmel. iv. 683. Wern. Mem. i. 564. Turt. Brit. 

 Faun. 216. Stew. Elem. ii. 446. Bosc, 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. 

 Eneyclopffidia, 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. 



