ESCIIARID^ : CELLULARIA. 341 



species intended, Mr. W. Thompson informs me, is C. avicularia. 

 " This, with a few other trivial errors in Mr. Templeton's catalogues, 

 is entirely attributable to their being posthumous publications. With 

 respect to the present, for instance, the name ' Cellaria neritina ' was 

 hastily written with a pencil at the top of the page on which the spe- 

 cimens are fastened, but at the bottom the correct name ' CelL avicu- 

 laria' was written in ink as the one to be retained." W. Thompson. 



8. 0. PLUMOSA, cells linear- ohlong., with a spine at the outer 

 and upper angle ; the aperture elliptical, entire. Doody. 



Plate LXT. Fig. 1 — 5. 



Corallina piimila erecta ramosior, Rail Syn. i. 37, no. 20, tab. 2, fig. 1. Ellis in 

 Phil. Trans, abridg. x. 346, pi. 8, fig. b. B.-D.—Soh feathered Coralline, Ellis 

 Corall. 33, no. 1, pi. 18, fig. a. A. — Sertularia fastigiata, Lin. Syst. 1314. Fabric. 

 Faun. Grcenl. 445. Berk. Syn. i. 219. — Cellularia plumosa, Pall. Elench. 66. 

 Coiich Corn. Faun. iii. 128, pi. 23, fig. 4 — Cellularia fastigiata, jB/«mcHi. Man. 

 273. Flem. Brit. Anim. 539. — Cellaria plumosa, Ellis and Soland. Zooph. 21. 

 Lam. An. s. Vert. 2de edit. ii. 120. — Crisia plumosa, Lamour. Corall. 62. — Crisia 

 fastigiata, Templeton in Mag. Nat. Hist. ix. 468. — Bicellaria plumosa, Blainv. Ac- 

 tinolog. 459. 



Hob. — " Not uncommon beyond low water-mark," Fleming. 



Polypidom attached by fibrous roots, subcalcareous, caulescent, 

 erect, from two to four inches high, very much branched, the 

 branches panicled, dichotomous, with linear or filiform segments ; 

 cells oblong with a short pointed spine on the superior outer angle, 

 smooth, pellucid or somewhat crystalline, marked always with a 

 black or orange-coloured dot near the centre, the remains of the 

 dried polype ; ovarian capsules pearly, globular or pear-shaped, 

 placed over the apertures. 



In habit this fine species is sometimes like Sertularia argeutea, 

 but in general it is more tufted and bushy. Specimens occur with- 

 out an ovary on any cell, while others are loaded with them ; and 

 in one of the latter sort I found some of the segments of the branches 

 composed of a triple series of cells. The whole polypidom is usually 

 coloured of a pink or purplish hue. In an old condition the cells 

 become obsolete, and the habit of the species so altered, as to render 

 its detection in this guise somewhat difiicult to the inexperienced. 



I have divided the Cellularise into sections which seem to be of 

 generic value, but I am not sufiiciently acquainted with the struc- 



