124 
Z. HYDROIDA. 
Sertularia. 
Zooph. 52. Berk. Syn. i. 216. Fair. Faun. Groenl. 443. Turt. Gmel. 
iv. 678. Wern. Mem. i. 564. Turt. Brit. Faun. 213. Stew. Elem. ii. 
442. Lam. Anim. s. vert. ii. 121. 2d edit. ii. 149. Bose, Vers, iii. 108. 
Flem. Brit. Anim. 542. Hogg's Stockton, 32. Johnston in Trans. Newc. 
Soc. ii. 257, pi. 11, fig. 3 Clytia rugosa, Lamour. Cor. Flex. 204. 
Corallina, 89. Templeton in Mag. Nat. Hist, ix, 466 La Campanu- 
laire rugueux, Blainv. Actinol. 473. 
Hab. Parasitical on Flustrae, Sponges and Fuci at low water- mark, 
common. Briglithelmstone, Ellis. Near Hartlepool, common, Mr 
Hogg . Leith shore, Jameson. Shores of N. Durham and Berwick- 
shire. 
A small species not exceeding an inch in height, and well distin- 
guished by its strongly wrinkled cells which resemble a barrel in 
miniature. Polypidoms gregarious, the shoots united by a radical 
branching fibre, erect or creeping, obliquely twisted or ringed between 
the cells, simple or sparingly branched, the branches irregular, pa- 
tent. Cells crowded, alternate, subsessile, ovate, coarsely wrinkled, 
especially when dried, contracted at the orifice which is obsoletely 
tridentate. The ovarian vesicles are sparingly evolved, and differ 
from the cells only in being a little larger, and in having three teeth 
in the opening at the top of each. As a parasite it does not confine 
itself to Flustra foliacea, as Pallas would have us to believe, but in- 
fests the roots and stems of many sea- weeds. 
* * Cells in pairs, opposite or semialternate. 
5. S. rosacea, cells opposite, tubulous , the upper half free and 
divergent , the aperture entire , truncate ; vesicles crowned with 
spines. Ellis. 
Plate IX. Fig. 1, 2. 
Lily or Pomegranate-flowering Coralline, Ellis, Coral!. 8, no. 7, pi. 4, fig. 
a, A. Phil. Trans, abridg. x. 492, pi. 12, fig. 5, s — H Sertularia 
rosacea, Lin. Syst. 1306. Ellis and Soland. Zooph. 39. Berk. Syn. 
i. 215. Turt. Gmel. iv. 676. Turt. Brit. Faun. 212. Wern. Mem. i. 
564. Stew. Elem. ii. 440. Lam. Anim. s. Vert. ii. 119. Bose, Vers, 
iii. 105. Hogg's Stockton, 32. Johnston in Trans Newc. Soc. ii. 258. 
Templeton loc. cit. 468 Sert. nigellastrum, Pall. Elench. 129. 
Sert. abietina ? Fabric. Faun. Groenl. 442. — Dynamena rosacea, La- 
mour. Cor. Flex. 175. Corallina, 79. Flem. Brit. [Anim. 544. La 
Dynamene rosacee, Blainv. Actinol. 484. 
Hab. Frequent on Corallines, and occasionally on old shells, from 
deep water. At Brighthelmstone adhering to oyster-shells, Ellis. 
Scarborough, Mr Bean. A rare species near Hartlepool, Hogg. 
Coast at Dunstanborough Castle, Mr H, Embleton. Leith shore, 
Jameson. Shore of Belfast Lough, Templeton. Coast of Berwick- 
shire and N. Durham. 
