262 Z. ASCIDIOIDA. Crista. 



branch. The opening of each cell, which is in the front of its upper 

 part, is surrounded by a thin circular rim; and the substance of the 

 cells appears to consist of a fine transparent shell, or coral-like sub- 

 stance." 



* * Cells paired, with a joint between each pair. (Crista.) 



3. C. EBURNEA, " cells looselxj aggregated^ cylindrical^ bent, 

 tubidar orifices free^^ Ellis. 



Plate xxx. Fig. 3, 4. 

 Tufted Ivory Coralline, Ellis, Corall. 39, no. 6, pi. 21, fig. a, A Cel- 



lularia eburnea. Pall. Elench. 73. Hogg's Stock. 35 Sertularia 



eburnea, Lin. Syst. 1316. Berk. Syn. i. 220. Turt. Gmel. iv. 686. 



Wern. Mem. i. 565. Turt. Brit. Faun. 217. Stew. Elem. ii. 449 



La Sertolara d'avorio, Cavol. Pol. Mar. 240, tav. 9, fig. fig. 5, 6 



Cellaria eburnea, Ellis and Soland. Zooph. 24. Bosc, Vers, iii. 133. 



Lam. Anim. s. Vert. ii. 138, 2de edit. ii. 184. Johnston in Trans. Newc. 



Soc. ii. 262, pi. 11, fig. 5 Crisia eburnea, Lamour. Cor. Flex. 138. 



Corall. 60. Flem. Brit- Anim. 340. Templeton, in Mag. Nat. Hist. 



ix. 468 La Crisie ivoire, Blainv. Actinolog. 460, pi. 78, fig. 3. Risso, 



L'Europ. Merid. v. 318. 

 Hah. Parasitical on the roots of sea-weed, and on other zoophytes, 

 very common. " Alibi pollicarem et ultra inveni, in Sussexise v. gr. 

 littore, ubi in Fuco pinastroide, una cum C. falcata et anguina abun- 

 dabat," Pallas. 



Grows in little bushy tufts of ivory whiteness, frequently tinted 

 with rose-red, from a quarter to fully an inch in height, attached by a 

 few capillary fibres dilated at their points of insertion into minute calca- 

 reous bulbs. Polypidom much branched, the primary divisions alter- 

 nate, spreading ; the secondary from one side only and bending in- 

 wards with a slight curve. Cells in two rows, nearly opposite or 

 semi-alternate, with a joint between each pair, adnate, frosted, the 

 aperture circular, somewhat oblique, even and entire. Vesicles ob- 

 pyriform, roughish or granulated, sparingly and seldom produced. 



4. C. LUXATA, " cells closely aggregated, cylindrical^ nearly 

 straight, with short tubular orifices ; joints black." Rev. J. 

 Fleming. 



Plate xxx. Fig. 5, 6. 



Crisia luxata, Flem. Brit. Anim. 340 La C. luxee, Blainv. Actinolog. 



460. 

 Hah. " On corallines, not rare, from various parts of the coast,'' 

 Fleming. CuUercoats, Northumberland, Mr Jos. Alder. Berwick 

 Bay, very rare. 



Polypidom erect, about an inch in height, white and calcareous, 



