ESCHARID^E : CELLULARIA. 335 



* Aperture of the cell terminal. 



1. C. CILIATA, erect) dichotomous ; cells alternate, turbinate, 

 the aperture open, oblique, and spinous on the outer edge. Ellis, 



PLATE LVIII. FIG. 1, 2. 



Ciliated Coralline, Ellis Corall. 38, no. 5, pi. 20, d. D. Sertularia ciliata, Lin. Syst. 

 1316. Berk. Syn. i. 220. Esper Pflanz. Sert. tab. 14, fig. 1, 2. Cellularia cili- 

 ata, Pall. Elench. 74. Flem. Brit. Anim. 540. CeUaria ciliata, Ellis and Soland. 

 Zooph. 24. Lam. Anim. s. vert. ii. 139: 2de. edit. ii. 186. Crisia ciliata, Lamour. 

 Corall. 60. Templeton in Mag. Nat. Hist. ix. 468. Van Beneden Mem. 51, pi. 6. 

 fig. 9-11. Bicellaria ciliata, Blainv. Actinol. 459. Cellularia ciliata, Johns. Brit. 

 Zooph. 290, pi. 38, fig. 1, 2. Couch Zooph. Cornw. 56 : Corn. Faun, iii, 126, pi. 

 23, fig. 1. 



Hob. Parasitical on corallines and the roots of Fuci, within low- 

 water mark, not uncommon. Sparingly found on algae and zoo- 

 phytes around the coast of Ireland, W. Thompson. 



Tufted, about half an inch in height, very slender and delicate, 

 hispid, pellucid white, calcareous, dichotomously branched. The 

 cells are rather widely alternate, turbinate, with the apertures ter- 

 minal, everted, patulous, and armed with four or five long spines on 

 the outer edge which are apt to be broken off. There is also a simi- 

 lar spine on the inner side of the cell originating a little below its 

 margin. The spines appear to be tubular. A saccate pearly lid 

 covers the mouth of many cells ; and at or near the base there is, on 

 some of them, a small anomalous appendage something like a bird's 

 head. The pellucidity and delicacy of this species, with its pearly 

 lids scattered over the branches, render it a remarkably beautiful 

 object under the microscope. 



" The polypes are ascidian, with from twelve to sixteen tentacula. 

 I have observed the number of tentacula to vary in many ascidian 

 polypes." E. Forbes. 



2. C. TERN ATA, diffuse, branched dichotomously ; "cells ter- 

 nate, with a joint above and below ; mouths ovate, with sessile 

 margins.' 1 '' Dr. David Skene. 



PLATE LIX. 



Cellaria ternata, Ettis and Soland. Zooph. 30. Sertularia ternata, Turt. Gmel. iv. 



687. Crisia ternata, Lamour. Corall. 61.- Tricellaria ternata, Flem. Brit. Anim. 



540. Blainv. Actinolog. 458. 



Hob. " Sent from Aberdeen by the ingenious Dr. David Skene," 

 Ellis. "My specimens were found in Zetland," Fleming. From 

 deep water at Scarborough, attached to a valve of Cytherea ovata ; 



