336 POLYZOA INFUNDIBULATA. 



also on Plumularia falcata and Sertularia abietina, not rare, W. 

 Bean. 



Polypidom confervoid, spreading, rooted by some long filiform 

 tubular fibres, about an inch in height, white and calcareous, much 

 branched dichotomously, the divisions short, patent, slender : cells 

 triad, long, narrow at their origin, growing wider upwards, smooth 

 and crystalline, the aperture subterminal, oval, with a raised bony 

 rim armed above with two or three short obtuse spines that are fre- 

 quently obsolete or broken away. There is a distinct joint between 

 every three cells which thus form a set, having the apertures all on 

 one plane, and rising a little above each other or subalternating ; 

 the two lower cells have a projecting angular shoulder opposite the 

 aperture, while from the corresponding sides of the upper one origi- 

 nate the new triads of cells. The joints are of a less calcareous 

 texture than the cells. This is evidently a Cellularia, connecting, 

 however, that genus with Crisia, to which latter it is affined by its 

 habit, its vitreous texture, and the great length of the cell in pro- 

 portion to the diameter of the aperture. This, in dried specimens, 

 is covered over with a membrane leaving a circular hole above, and 

 forming a sort of operculum when the living polype lies hid in a 

 state of retraction. 



'"' '" Aperture superior, subterminal, oval. 



3. C. SCRUPOSA, creephig., dichotomous ; cells alternate wltli 

 a 'plain aperture., " an angle projecting on tlie outward side of 

 each.'''' Ellis. 



Plate LVIII. Fig. 5, 6. 



Creeping stony Coralline, Ellis Corall. 38, no. 4. pi. 20. c, C. — Celliferous Coralline 

 with angular edges to its cells, Ellis in Phil. Trans, xlviii. pi. 13, no. 7. Phil. 

 Trans, abridg. x. 493, pi. 12, fig. 7, K, L. — Sertularia scruposa, Lin. Syst. 1315. 

 Esper Pflanz. Sert. tab. 15. fig. 1-3. Berk. Syn. i. 220 — Cellularia scruposa, 

 Pall. Elench. 72. Flem. Brit. Anim. 539. Couch Zooph. Cornw. 57 : Com. 

 Faun. iii. 126, pi. 23, fig. 2. Reid in Ann. and Mag. Nat. Hist. xv. 69 : and 

 xvi. 388. — Cellaria scruposa, MZw and Soland. Zooph. 23. Bosc Vers. iii. 132, pi. 

 29, fig. 7. Lam. Anim. s. Vert. ii. 141 : 2de edit. ii. 192. Johnston in Trans. 

 Newc. Soc. ii. 261, pi. 11, fig. 5. — Crisia scruposa, Lamour. Corall. 60. Templetonm 

 lib. cit. ix. 469. — Bicellaria scniposa, Blai?iv. Actinol. 459. — Scrupocellaria scru- 

 posa, Van Beneden Recherch. 43, and 50, pi. 5, fig. 8-16. 



Hah. On the roots of Laminaria digitata, on Flustrre, corallines 

 and old shells, common. 



This frequently covers a space about an inch square, the branches 

 diverging and creeping along the surface or the entangled roots of 

 sea-weed, to which they are attached by simple tubulous root-like 



