CELLEPORA RAMULOSA. 401 



b. Orifice without a sinus; zoarium ramose. 

 Cellepora RAMULOSA, Liimseus. 



Plate LII. figs. 7-9. 



Cellepora uamulosa, Linn. Syst. ed. xii. 1285: Flcm. B. A. 532: Lamk. 

 An. s. Vert. ed. 2, ii. 258: Couch, Corn. Faun. iii. 110, 

 pi. XX, fig. 2 : Johisf. B. Z. ed. 2, 296, pi. Iii. figs. 4, 5 : 

 Busk, B.M. Cat. ii. 87, pi. cix. figs. 1, 2, 3 ; Crag Pol. 

 58, pi. ix. fig. 2 : Alder, Quart. Journ. Micr. Sc. (n. s.) 

 iv. 96, pi. ii. fig. 1 : Smitt (forma 3), loc. cit. 31 & 192. (Not 

 C. ramulosa of Manzoni, Bryoz. foss. Ital., Contr. iv. 12, 

 pi. V. figs. 29, 29', and pi. vi. figs. 30, 30', 30".) 



MiLLEPORA puMicosA (part.), Pall. Elench. 254. 



Cellepora pumicosa, rar., M. Sars, Reise i Lof. og Finm. 27. 



Zoarium erect, much and irregularly branched, rising 

 commonly from a spreading base, branches cylindrical, 

 or broad and somewhat compressed, dichotomous, usually 

 tapering very slightly towards the extremity. Zooecia 

 ovate, smooth and glossy, elongate, slender, and regu- 

 larly disposed in the younger portions of the colony ; 

 in the older prominent and ventricose, and irregularly 

 placed ; orifice suborbicular, with a thin raised peri- 

 stome, a strongly developed rostrum below, generally 

 produced into a sharp point, with an avicularium on one 

 side of it, the base of which projects, like a spur, over 

 the apertm'e (Plate LII. fig. 9), mandible acute, directed 

 upwards : spatulate avicularia distributed occasionally 

 amongst the cells. Ooecia subglobosc, broader than 

 high, smooth and silvery, often produced in front into 

 a penthouse-like projection; surface generally entire, 

 rarely punctured. 



Polypide of a faint red or flesh-colour, with numerous 

 tentacles. 



Height 1 to 3 inches. 



Habitat. On the stems of Sertularian hydroids, shells, 

 &c., chiefly from rather deep water. 



Localities. Cornwall, 30 fathoms ; South Devon ; 



2d 



