SERTULARIA. 



In the center of the frontifpiece to my Eflay on Coral- 

 lines I have given a figure of this beautiful Coralline, 

 as it appears alive in the fea. The figure in tab. 7. was 

 drawn from a dried fpecimen. 



12. Sertularia Pluma. Podded Coralline. 



Sertularia denti cutis fe- This Coralline has bell- 



cundis imbricatis campa- fhaped denticles, lying clofe 



nulatis, ovariis gibbis cri- above one another ; the ova- 



Jiatis^ fur cults pinnatis tan- ries are gibbous and crefted ; 



ceolatis altemis. the little fprigs rife alternately, 



and are pinnated. 



'The Podded Corallme. Ellis Corallin. p. 13. tab. 7,, 

 No. 12. fig. b. B. 



Sertularia Pluma. Linn. Syft. Nat. Ed. 12. pag. 1309, 



This neat feathered Coralline is* generally found climb- 

 ing up, and furrounding fucus's, particularly the podded 

 Fucus. Its little tubulous radicles are difpofed in circles 

 round the ftem of the Fucus in fuch a manner, by uni- 

 ting together, that the force of the fea cannot feparate 

 it without tearing the Fucus to pieces. The fide branches 

 that fupport the denticles are jointed ; and the denticles, 

 whofe margins are ferrated, are fupported in the front of 

 each by a little projecting hollow fpine, which, in the 

 Sertularia Pennatula, one of this tribe, is longer and more 

 diftindl, but cut oft' at the end, as will appear in tab. 7. 

 fig. 1. 2. This little fpine does not appear in our figure, 

 on account of the painter's drawing the Coralline from an 

 oblique back view of the branches. See the figure in 

 ErTay on Corallines, tab. 7. The pods or ovaries have 

 generally five criflated ribs, pointing obliquely upwards, 



G 2 and 



43- 



