Crisia. Z. ASCIDIOIDA. 261 



s. Vert. ii. 139. 2de edit. ii. 187 Eucratea cornuta, Lamour. Cor. 



Flex. 149. Corall. 64. Risso, L'Europ. Mend. v. 319. Fkm. Brit. 



Anitn. 541. Te.mpleton, in Mag. Nat. Hist. ix. 469 L'Unicellaire 



cornue, Blainv. Actinol. 462. 



Hub. Parasitical on other corallines, and " adhering to Fuci be- 

 yond low water-mark, not common," Fleming. Very rare at Scar- 

 borough, Mr Bean. Occasionally found in tufts of Crisia eburnea 

 on the coast of Berwickshire, G. J. " Found in the pools on the 

 rocks below Bangor, very common," Templeton. 



Polypidom sometimes half an inch in height, very slender, erect, 

 confervoid, white and brittle when dry, rooted by a few tubular fibres, 

 alternately branched, the secondary branches unilateral, secund. 

 The coralline consists of a series of cells placed one above another, 

 the upper cell originating from the one below near the middle, at its 

 point of divarication from the straight line ; and a long tubular spine, 

 which ov^ertops the cell, rises from the same place. The cells are 

 curved, tubular, smooth, the upper half everted, with a plain circular 

 aperture. In some specimens oval-shaped vesicles are found scatter- 

 ed over the polypidom : they originate from the base of a cell, are 

 specked, and have a small tube at the back. 



2. C. CHELATA, cells ill the form of a horn; the aperture ob~ 

 lique, marginatedi vAth a spinous process beneath the rim. Ellis. 

 Vignette, Fig. 43, page 260. 



BuU's-horn Coralline, Ellis, Corall. 42, no. 9, pi. 22, fig. h,B Sertu- 



laria loricata, Lin. Syst. 1316. Berk. Syn. i. 220. Turt. Gmel. iv. 



686. Turt. Brit. Faun. 217. Stew. Elem. ii. 449 Cellularia che- 



lata. Pall. Elench. 77 CeUaria chelata, Ellis and Soland. Zooph. 25. 



Bosc, Vers, iii. 134. Lam. Anim. s. Vert. ii. 140. 2de edit. ii. 189. 



Eucratea chelata, Corall. 64, pi. 3, fig. 5 E. loricata, Flem. 



Brit. Anim. 541 L'Unicellaire cornet, Blainv. Actinolog. 461, pi. 



77, fig. 2 Loricula loricata, Templeton, in Mag. Nat. Hist. ix. 469. 



Hah. Parasitical on Fuci, rare. On stones at very low tides, very 

 rare at Scarborough, Mr Bean. " Common on the coast" of Ire- 

 land, Templeton. Cork Harbour, J. V. Thomj^son. 



Smaller and more distinctly catenulated than the preceding. Ellis's 

 description is very good. " This beautiful coralline is one of the 

 smallest we meet with. It rises from tubuli, growing upon Fucus's ; 

 and passes from thence into sickle-shaped branches, consisting of 

 single rows of cells, looking, when magnified, like bull's horns invert- 

 ed, each one arising out of the top of the other. The upper branches 

 take their rise from the fore part of the entrance of a cell, where we 

 may observe a stiif short hair, which seems to be the beginning of a 



