36 SERTULARIA. 



out of the continuation of thefe radical parts : from this 

 ftem fo formed proceed their branches, furnifhed with den- 

 ticles and polype-like heads, as we may obferve in Phil. 

 Tranf, Vol. 47. tab. 17. fig. G. where there is a mao-ni- 

 fied reprefentation of the Sertularia halecina, or Herring- 

 bone Coralline, drawn as it was alive in fea-water. 



1 . Sertularia tamarifca. Sea-Tamarijk Coralline: 



Sertularia alternatim This has alternate branches 



ra7?iofa i dei7ticulis oppoji- and oppofite tubulous denti- 

 tis tubulofis crenath) ova- cles, waved at top. The ova- 

 riis ovato-truncatis hi- ries are of an oval form, cutoff 

 de?7ticulatis i ore tubulofo. at the top, with two fmall 



points at the corners, together 

 with a little tube for a mouth 

 to each. 



Sea-Tamarijk. Ellis Corallin. pag. 4. tab. 1. No. i» 

 fig. a. A. 



Sertularia tamarifca. Linn. Syft. Nat. Ed. 12. p. 1 307. 



This is the larger): kind of Sertularia, and but rarely 

 found on thefe coafts. I have received it lately from Dr. 

 David Skene, of Aberdeen. The figure was taken from 

 one found in Ireland ; where in the winter feafon they are 

 full of veficles, one inferted at the bottom of each pair 

 of denticles. The ovaries of thofe from Scotland had no 

 points ; but this might be owing to their being young. 



2. Sertularia abietina.. Sea-Fir Corallirie. 



S-srtularia alternatifn The Sea-Fir Coralline is al- 



pinnata^ denticulis fubop- ternately pinnated with denti- 



pofnis 



