80 ANTHOZOA HYDROIDA. 



their orifices inclined to one side ; they are bellied like a Florence- 

 flask, with a narrow divaricated neck terminated with a small 

 oblique aperture : on some of the branchlets every pair is separated 

 by a joint or stricture, while on others several pairs occur in suc- 

 cession without the interference of such a stricture. Vesicles scat- 

 tered, oval, smooth, attenuated at the base. 



In young specimens of an inch or two in height the polypidom is 

 simply pinnate, and as it rises, the branches gradually divide into 

 more numerous segments. In Plate XIV. Fig. 3, I have given a 

 figure of such a specimen, selected from many others, on account of 

 its greater divergence from the usual character of the species. 

 When, on the contrary, the polypidom attains a foot or more in 

 height, the lower half of the stem loses its branches and cells, and 

 becomes entirely naked. I think it likely that such a specimen, 

 of the unusual size of three feet, constitutes the Sertularia uber of 

 Sir J. G. Daly ell, in Edin. New Phil. Journ, xvii. 412. 



" Independently of the differences to be observed in the form of 

 the cells and vesicles, which are generally pretty constant, between 

 this and the following species (8. cupressina) there are many others 

 pertaining to their general habit and appearances. The polypidoms 

 of this species are frequently met with growing in closely aggre- 

 gated clusters, and are sometimes even branched a condition in 

 which I have never found the other : it is also of a darker colour, 

 and more rigid texture, and never attains the same height. The 

 polypiers also do not end in the beautiful spire so remarkable in 

 S. cupressina, but terminate much more abruptly. The branches 

 too are usually shorter, broader, and not arched, as in the other 

 species." A. E. If assail. 



17. S. CUPRESSINA, polypidom cauliferous ; cells nearly op- 

 posite, tubulous, adnate, the aperture scarcely contracted, bila- 

 biate, with two minute spinous teeth ; vesicles nearly oval. 

 Ellis. 



PLATE XVI. 



Sea-cypress, Ellis Corall. 7, No. 5, pi. 3, fig. a, A. Sertularia cupressina, Lin. Syst. 

 1308. Ellis anASoland. Zooph. 38. Berk. Syn. i. 216. Wera. Mem. i. 564. 

 Lam. Anim. s. Vert. ii. 118. Lamour. Cor. Flex. 192. Hogg's Stock, 32. Tein- 

 pleton in loc. cit. 468. Stark Elem. ii. 440, pi. 8, fig. 12. Risso L'Europ. nirid. 

 v. 311. Hassall in Ann. and Mag. Nat. Hist. vi. 168. Macgillivray in ibid. ix. 

 464. Couch Zooph. Cormv. 1 1 : Corn. Faun. iii. 26. Dynamena cupressina, 

 Flem. Brit. Anim. 543. 





