92 ANTHOZOA HYDROIDA. 



both were open at their extremities, but the fleshy central matter 

 had nowhere developed itself as yet into the form of a polypus. 

 Polypi, therefore, are not the first-formed parts of this zoophyte, but 

 are organs which appear long after the formation of the root and 

 stem, as the leaves and flowers of a plant." Professor Grant. 



2. P. CRIST ATA, shoots simple, plwmous, the pinna 

 cells in a close row, cup-shaped with a toothed margin and a 

 short lateral spine ; vesicles gibbous, girt with crested ribs. 

 Ellis. 



PLATE XXIII. Fig. 13. 



The Podded Coralline, Ellis Corall. 13, no. 12, pi. 7, fig. 6, B. Sertularia pluma, 

 Lin. Syst. 1309. Pall. Blench. 149. Ellis and Soland. Zooph. 43. D. Chiaie 

 Anim. s. Vert. Nap. iv. 145. Esper Pflanz. Sert. tab. 7, fig. 1, 2. Oliv. Zool. 

 Adriat. 289. Lister in Phil. Trans, an. 1 834, 369, pi. 8, fig. 2. Aglaophenia 

 pluma, Lamour. Cor. Flex. 170. Corall. 75. Krauss Corall. und Zoophyt. der 

 Sudsee, 25. Plumularia cristata, Lam. Anim. s. Vert. ii. 125 : 2de 6dit. ii. 161. 

 Templeton in Mag. Nat. Hist. ix. 467. Risso L'Europ. merid. v. 31 3. Hassall in 

 Ann. and Mag. N. Hist. vi. 169 ; and vii. 285. Couch Zooph. Cornw. 15 : Corn. 

 Faun. iii. 31, pi. 8. PI. pluma, Flem. Brit. Anim. 546. Sertolaria pluma, Cavol. 

 Pol. mar. 210, tav. 8, fig. 5-7. 



Hob. On Fuci, particularly on Halidrys siliquosa, and sometimes 

 "on muscles and other shells." Common on the southern coasts 

 of England. On the Bootle coast, rare, Mr. Tudor. Ayrshire, 

 Rev. D. Landsborough. On the coast of Ireland, near Dublin, 

 Ellis. Found around the coast of Ireland, whence all the speci- 

 mens which have come under my observation were on Halidrys 

 siliquosa, W. Thompson. 



Attached to sea-weeds by a flexuous horny anastomosing tubular 

 fibre, which throws up, at intervals, plumous shoots from one to 

 three inches high : these are very elegant and erect when in the 

 sea, but when dry become curved in a falcate manner with all their 

 pinnules, which are also frequently laid to one side. " Siccatione 

 surculi sursum seu contrario modo quam fuerant, recurvantur, pin- 

 nulseque curvatse ad invicem accedunt." Pallas. The polypidom is 

 of a honey-yellow colour with a dark-brown rachis, which is smooth, 

 and divided by numerous oblique septa or joints, there being one 

 between every pair of pinnae. Pinnae alternate, close, parallel, cellu- 

 liferous on the upper side ; the cells separated by a joint and set in 

 a sort of indentation in the stalk. They have been aptly compared 

 by Ellis to the flower of the lily of the valley, being of a campanu- 



