CELLEPORID.E : CELLEPORA. 295 



zoophyte is the most delicate and the prettiest of its class. (See 

 PLATE LI., fig. 1, 2.) It is very thin and apparently calcareous 

 in texture, and resembles Sertularia pumila and rosacea in the 

 manner in which the cells are placed on the rachis, and in the 

 jointed character of the rachis itself. This structure lends support 

 to those who refer the polypidom to Sertularia or Dynamena ; 

 and, after an examination of Mrs. Griffiths' specimens I am 

 more favourable to this opinion than formerly. The process " like 

 a short tobacco-pipe " lies over the mouth of the cell, is at- 

 tached to the rachis by a bulged basis, and the bowl or head of the 

 process, resting on the outer angle of the aperture, is hollow with a 

 slightly sinuated rim. Pallas says that this bowl is the aperture of 

 the cell, in which he appears to be wrong. There is nothing ex- 

 actly resembling it in any other zoophyte known to me, but I think it 

 may be analogous with a somewhat similar organ in the Laomedea 

 obliqua, or with the "bird's-head" processes in the Cellularise. The 

 resemblance, however, is not close enough to indicate any great pro- 

 bability of sameness in their use in the economy of the polype ; but 

 they have this in common with the " bird's-head " processes, that 

 they are not found on every cell of the polypidom. 



FAMILY CELLEPORIDjE. 

 12. CELLEPORA,* Otho Fabricius. 



CHARACTER. Polypidom calcareous, cellular, irregularly 

 lobed or ramous, formed of urceolate cells heaped together or 

 arranged in quincunx. Polypes ascidian. 



1. C. PUMICOSA, glomerous, rough, porous ; cells suborlicular, 

 the mouth round with a produced marginal process. Ellis. 



PLATE LIT. Fig. 1, 2, 3. 



Porous Eschara Ellis Corall. 75, no. 7, pi. 27, fig. /, F, and 72, pi. 30, fig. d, D. 

 Tubipora verrucosa, Lin. Syst. edit. 10, 789. Cellepora pumicosa, Lin, Syst. 1286. 

 Mull. Zool. Dan. prod. 253. Berk. Syn. i. 212. Stew. Elem. ii. 428, pi. 12, fig. 16, 

 17, copied from Ellis. Lam. Anim. s. Vert. ii. 170 : 2de 6dit. ii. 256. Lamour. 

 Corall. 40. Flem. Brit. Anim. 532. Johnston in Trans. Newc. Soc. ii. 267. 

 Templetonin Mag. Nat. Hist, ix 469. Couch. Zooph. Cornw. 48 : Corn. Faun. iii. 

 110, pi. 20, fig. 4, 5. C. verrucosa, Lin. Syst. 1286. Fabric. Faun. Grcenl. 434. 

 Oliv. Zool. Adriat. 229. C. spinosa, Turt. Brit. Faun. 205. Millepora pumicosa, 



* From cello, a cell, and iropog. 



