17 



and separated frmu tlie stem by a joint, short with everted 

 apertures; vesieles scattered. Polypes liydratonn. 



* Cells distinctly alternate. 



GREAT TOOTH CORALLINE. S. Poli/zonias. Erect, 

 subflexuous ; cells ovate, witli a wide soioewhat uueveii 

 aperture; vesicles obovate, wrinkled across, the orilice 

 contracted and plain. 



Corallina minus ramosa, alterna vice denticulata. Musciis 

 marinus denliculatus minor, denticellis alternis ; Rail 

 Synop., vol. 1, p. 35, no. 13. Great Tooth Coralline, Ellis' 

 Coral., pi. 5, pi. 2, fig. a A., and pi. 38, fig. 1 A; Sertularia 

 polyaonias, Ellis and Solander's Zoopk., p. 37, no. 3. 

 Turton's Lin. vol, 4, p. 683. Blumenbach's Man., p. 273. 

 Stewart's Elem., vol. 2, p. 447. Fleming's Brit. An., p. 542. 

 Templetou in Mag. Nat. Hist., vol. i), p. 4G8. Johnston's 

 Brit. Zooph., p. 122, pi. 8, figs. 1, 2, and 3. Lamouroux'^j 

 Cor. Flex., p. 190. 



Hab. On fuci beyond low water mark, on stones and 

 shells from deep water; common. Parasitical on Alcyoniuia 

 digitatum, or dead man's hands, and other coralhnes; very 

 common, from the Rame Head to the Lizard, and ten leagues 

 from the shore. 



There are two varieties of this species, both alike com- 

 mon ; the first, where the stem is composed of a single fiore 

 and sparingly branched, rarely exceeding two inches in 

 height ; the second, where the stem is composed of a 

 number of tubes twisted on each other and growing to 

 the height of six inches. In the last variety, the polypidom 

 is erect, rigid, and rooted, with tubular fibres whicii are 

 closely matted together. I have a fine specimen from deep 

 water, growing in a large tuft, ten inches in height. 



The following has also been considered a varity of this 

 species, but is now allowed to be distinct. 



ELLIS' CORALLINE. S. Ellisii. Climbing, flexuous ; 

 the cells urceolale, bulged at the base, with a tour toothed 

 rim ; vesicles with the opening four-toothed. 



Ellis' Corallines, p. 6, pi. 2, fig. b, B. Sertularia Ellisii, 

 Johnston's Brit, Zooph, p. 123. 



Hab. On Ascidia with other corallines ; leather rare. 



This can be distinguished from the last by the stem being 

 more zigzag, the mouth of the cell more decidedly tuiu- 

 toothed, and the whole more slender and climbing. Tne 

 vesicles are vasiform and surrounded with prominent bands, 

 which give them a remarkable appearcnce. 



