23 



by short peduncles from between the cells, and have small 

 sub-terminal apertures which are generally turned towards 

 the trunk. 



This species bears a general resemblance to the last, but 

 differs in having a closer arrangement of the branches, the 

 base bellied, aperture contracted, and in the semi-alternate 

 distribution of the cells. 



FERN" CORALLINE. S. Filicula. Cells in the form of 

 a Florence flask, opposite, a single one in the axilla of each 

 pinna; vesicles pear-shaped, smooth at the aperture and 

 shortly tubulous, entire. 



Dynamena Filicula, Fleming's Brit. An., p. 544. Fern 

 Coralline, Sertularia Filicula, Ellis and Solander's Zcoph., 

 p. 57, table 6, fig. c. C. Turton's Lin., vol. 4, p. 681. 

 Stewart's Elem., vol. 2, p. 445. Lamouroux's Cor. Flex., 

 p. 188. Johnston's Brit. Zooph., p. 131, pi. 1 1. 



Hob. On Fuci, rather rare. Talland sand bay, Polperro. 



This species varies in height from one lo four inches, is of 

 a yellowish brown colour, zig-zag and spreading laterally. 

 The branches are given off somewhat bifariously, but some- 

 times very irregularly. The trunk, and branches are 

 divided at short intervals by imperfect septa. The pinnae 

 are numerous, and arise in an alternate manner, one from 

 each internode. The cells, which are bellied at the base 

 with plain everted apertures, are opposite and in single pairs 

 on each internode, with a single cell in the bend of each 

 pinna as it arises from the trunk. The vesicles are pear 

 shaped, arising from the upper part of the base of the cells 

 by a short peduncle, and the apertures are contracted and 

 tubular. 



This species may be distinguished from all others by the 

 single cell which stands in the axillae of all the pinnae. Ia 

 other respects it approaches very closely to the Great 

 toothed Coralline. 



SEA HAIR. S. Operculata. Cells opposite, larger above 

 than below; mouth patulous, scarcely everted, the outer 

 edge terminating in a long tooth with two lateral smaller 

 ones, a joint above each pair ; vesicles pedunculated, 

 obovate. 



Corallina muscosa denticulata procumbens, caule tenuis- 

 simo, denticellis ex adverso sitis. Raii Synop. Stirp., vol. 1, 

 p. 36, no. 18. Sea Hair, Ellis' Corals, 8, no. 6, tab. 3, fig. 

 b. B. Dynamena operculata, Fleming's Brit. An., p. 544. 

 Lamouroux's Cor. Flex., p. 176*. Sertularia operculata, 

 Ellis and Solander's Zooph,, p. 39, no. 6. Turlon's Lin., 

 vol. 4, p. C76. Stewart's Elem., vol. 2, p. 441. Tern pie ton 



