150 
Z. HYDROIDA. 
Laomedea. 
tide at the base of all the cells, each of which occupies a joint. Vesi- 
cles scattered, small, pear-shaped, the rim of the opening plain. 
10. Laomedea.* Lamouroux. 
Character. Polypidom rooted by a creeping fibre , plant- 
like , erect ; jointed at regular intervals , the joints ringed , incras- 
sated , giving origin , alternately on opposite sides , to the shortly 
pedicled cells ; cells campanulate : vesicles axillary . — Polypes 
hydraform. 
1. L. dichotoma, stem filiform , branched dichotomously ; 
cells alternate , campamdate , the rim even . Ellis. 
Plate XXII. Fig. 1, 2. 
Sea-thread Coralline, Ellis , Corail. 21, no. 18, pi. 12, fig. a, A. Sertu- 
laria dichotoma, Lin. Syst. 1312. Ellis and Soland. Zooph. 48. Berk. 
Syn. i. 218. Turt. Gmel. iv. 682. Wern. Mem. i. 564. Turt. Brit. 
Faun. 215. Stew. Elem. ii. 446. Bose, Vers, iii. 118. Hogg's Stock. 
33 _S. longissima, Pall. Elench. 119. Sert. volubilis, Fabric . 
Faun. Grcenl. 444. Laomedea dichotoma, Lamour. Cor. Flex. 207. 
Corall. 91. Risso, L’Europ. Merid. v. 314. La Laomedee dichotome, 
Blainv. Actinol. 474. Campanularia dichotoma, Lam . Anim. s. Vert. 
ii. 113. Elem. Brit. Anim. 548. Stark, Elem. ii. 441. Risso, L’Europ. 
Merid. v. 309. Grant in Edin. New Phil. Journ. i. 151. Grant in 
Cyclop. Anat. and Phys. i. 108, fig. 30. Grant, Comp. Anat. 10, fig. 
5. Johnston in Trans. Newc. Soc. ii. 255. Templeton in Mag. Nat. 
Hist. ix. 469. Lister in Phil. Trans, an. 1834, 372, pi. 8, fig. 5. 
Hab. On old shells in deep water, common. “ This is found in 
great abundance on the south- w^est coast of England, and seems most 
curiously contrived, from its structure, to resist the violence of the 
waves, all its joints being furnished with springs,’’ Ellis. Scarborough, 
Mr Bean. Dunstanborough Castle, Mr B. Embleton . Berwick 
Bay, G. J. Leith shore, Jameson. Found on the shore of Dublin 
Bay, &c. Templeton. 
Polypidom confervoid, rooted by a creeping flexuous fibre, from 
four to six inches high, slender, filiform, smooth, of a blackish colour, 
wavy, branched in a dichotomous or alternate manner, the branches 
ringed at their origins, simple or divided like the primary stem. The 
cells are bell-shaped, on ringed stalks, transparent and very tender, so 
that specimens gathered amongst the rejectamenta of the sea are 
mostly deprived of them. Polypes reddish. Vesicles ovate, smooth, 
axillary, filled with ova in spring. These are numerous, “ amount- 
ing to twenty or thirty in each vesicle,” and like the ova of zoophytes 
* A.xofxeS'uct , — the name of one of the Nereids, according to Hesiod’s Theo- 
gony. v. 257. 
