SERTULARIADJE : HALECIUM. 59 



Coral. 17, no. 15, pi. 10. Phil. Trans, xlviii. 506, pi. 17, fig. f. E. Sertularia 

 halecina, Lin. Syst 1308. Pall. Blench. 113. Fabr. Faun. Grcenl. 443. Oliv. 

 Zool. Adriat. 288. Ellis and Soland. Zooph. 46. Berk. Syn. i. 217. Esper Pflanz. 

 Sert. tab. 21, fig. 1, 2. Turt. Brit Faun. 213. Lam. Anim. s. Vert. ii. 119 : 2de 

 edit. ii. 1 46. Flem. Brit. Anim. 542. Johnston in Trans. Newc. Soc. ii. 259, 

 pi. 12, fig. 2. Thoa halecina, Lamour. Cor. Flex. 211. Templeton in Mag. Nat. 

 Hist ix. 468. Blainv. Actinolog. 488, pi. 84, fig. 4, 4, a. Lamour. Expos. 

 Method. 14. Hassatt in Ann. and Mag. Nat. Hist. vi. 167. Couch Zooph. 

 Corn. 5. Corn. Faun. iii. 15, pi. 3. Halecium halecinum, Schweig. Handb. 426. 



Hah. On old shells and stones in deep water, common. 



Polypidom from 4 to 10 inches high, fixed by numerous fibres 

 " irregularly matted together like a piece of sponge," of an earthy- 

 brown colour, stiff, brittle when dry, irregularly branched, the stem, 

 and principal branches composite, tapered upwards, pinnate ; the 

 pinnae alternate, patent, simple, jointed, and incrassated at the joints 

 where the cells are placed. These arise alternately from opposite 

 sides, one just below each joint ; they are subsessile, with a joint at 

 the base, of a tubular or rather deeply campanulate form with a 

 plain slightly everted rim, and of such a thin membranous texture 

 that they are rarely found entire on dried specimens or on such as 

 have been driven on shore by storms. Vesicles unilateral, scattered, 

 of an oval shape, " with a tube arising from the pedicle, and passing 

 up on one side to a little above the top of each." Ellis. Young 

 specimens are often partially coloured a bright yellow, dependent 

 apparently on the colour of the interior pulp. 



2. H. BEANII, vesicles calceoliform, the aperture subcentral, 

 shortly tubulous. William Bean. 



PLATE IX. FIG. 1, 2. 



Thoa Beanii, Johns. Brit. Zooph. 120, pi. 7, fig. 1, 2. Thompson in Ann. Nat. Hist. 

 v. 250. Hassall in Ann. and Mag. N. Hist. vi. 167. 



Hob. " Near Scarborough, in deep water, very rare," W. Bean. 

 " Procured by dredging in Belfast Bay, where it in some situations 

 takes the place of T. halecina. Before it was described as a dis- 

 tinct species, its peculiarities, independently of the remarkable 

 ovaries, were noticed by Mr. Hyndman and myself its general 

 aspect or habit first attracted our attention. Instead of the rigid 

 'herring bone' appearance of T. halecina, it is somewhat flexible 

 and graceful." W . Thompson. Dublin Bay, A . H. Hassall " Among 

 zoophytes collected in Dublin Bay by W. H. Harvey, Esq., in 1834, 



