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 jihre^ 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, campanulate, the rim even. Ellis. 



Plate XXII. Fig. 1, 2. 

 Sea-thread Coralline, Ellis, Corall. 21, no. 18, pi. 12, fig. a, A Sertu- 



laiia dichotoma, Lin. Syst. 1312. Ellis and Soland. Zooph. 48. Berh. 



Syn. i. 218. Turt. Gmel. iv. 682. Wern. Mem. i. 564. Turt. Brit. 



Faun. 215. Stew. Elem. ii. 446. Bosc, Vers, iii. 118. Hogg's Stock. 



3-3 S. longissima. Pall. Elencb. 119. Sert. volubilis. Fabric. 



Faun. Groenl. 444. Laomedea dichotoma, Lamour. Cor. Flex. 207. 



CoraU. 91. Risso, L'Europ. Merid. v. 314. La Laomedee dichotome, 



Blainv. Actinol. 474. Campanularia dichotoma. Lam- Anim. s. Vert. 



ii. 113. Flem. Brit Anim. 548. Stark, Elem. ii. 441. iJjsso, 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-west coast of England, and seems most 

 curiously contrived, from its structure, to resist the violence of the 

 waves, allits joints bein^ furnished with springs," JEllis. Scarborough, 

 Mr Bean. Dunstanborough Castle, Mr R. 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 colout-, 

 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*ofjiiS'ii», — the name of one of the Nereids, according to Hesiod's Theo- 

 gony. V. 257. 



