102 ANTHOZOA HYDROIDA. 



1. L. DICHOTOMA, stem filiform, flexuous, incrassated beloto 

 the joints and ringed above them, branched, the branches alter- 

 nate, from the bend of the joints ; cells campanulate, on ringed 

 tapered pedicles; ovarian capsules axillary, ovate, smooth. 

 Ellis. 



Var. a. Polypidom dichotomously branched, diffuse. 



Var. ft. Polypidom slender and elongate, pyramidal, alternately branched, the 



branches erecto-patent or spreading. 

 Var. 7. Polypidom irregularly branched, the branchlets pinnate. 



PLATE XXVI. FIG. 1, 2. 



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

 ramosa, pedunculis calyculorum contortis, Ellis Corall. pi. 38, fig. 3. Sertularia 

 dichotoma, Lin. Syst. x. 812. Lin. Syst. 1312. Ellis and Soland. Zooph. 48. 

 Berk. Syn. i. 218. Jameson in Wern. Mem. i. 564. Turt. Brit. Faun. 215. 

 Stew. Elem. ii. 446. D. Chiaie Anim. s. Vert. Nap. iv. 146. Oliv. Zool. Adriat. 

 289. Sertularia longissima, Pall. Elench. 119, a name which, as Olivi has re- 

 marked, is preferable to that of Linnaeus, but the latter has the claim of priority. 

 Laomedea dichotoma, Lamour. Cor. Flex. 207- Risso L'Europ. Merid. v. 314. 

 Blainv. Actinolog. 474. Couch Zooph. Cornw. 20 : Corn. Faun. iii. 37. Mac- 

 gillwray in Ann. and Mag. N. Hist. ix. 465 .Campanularia dichotoma, Lam. 

 Anim. s. Vert. ii. 113; 2de edit. ii. 132. Flem. Brit. Anim. 548. JRisso 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. Stark Elem. ii. 441. Templeton in Mag. Nat. Hist. ix. 469. 



Hob. On old shells, and other submarine bodies within tide-mark, 

 common. I frequently find it on the branches of trees that have 

 been carried by floods into the sea. 



Polypidom confervoid, erect, rising to the height of from twelve 

 to twenty-four inches, rooted by a creeping flexuous fibre : the stem 

 filiform, percurrent, flexuous or zig-zag, giving off from every bend a 

 short branch which, when perfect, is a miniature copy of the entire 

 polypidom. The branches are alternate, erecto-patent, arising from 

 a sort of rest at the joints in the stem, where it is perceptibly 

 thickened ; and it is ringed immediately above the joints, as is like- 

 wise the base of the branches. The branches from the lower and 

 mid parts of the stalks are all about equal in spread, but they 

 become gradually shorter as they approach the top, so that the 

 whole figure is somewhat pyramidal. Pedicles of the cells annular 

 throughout, tapered, generally about three times the length of the 

 cell, which is very exactly campanulate, with thin membranous 

 parietes and an even rim. Ovarian vesicles very shortly stalked, 

 axillary, pear-shaped, smooth, opening on the top with a plain 



