3$ S E R T U L A R I A. 



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 magni- 

 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 alt em at im This has alternate branches 



ramofa^ denticulis oppoji- and oppofite tubulous denti- 

 tistubulofis crenatis r ova- cles, waved at top. The ova- 

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

 denticulattSy ore tubulofo. at the top, with two fmall 



points at the corners, together 

 with a little tube for a mouth 

 to each. 



Sea-Tamari/i. Ellis Corallin. pag. 4. tab. 1. No. 1. 

 fig, a. A. 



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



This is the large ft 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 Coralline. 



Sertularia alternatim The Sea-Fir Coralline is a'l- 



pinnata, denticulis fubop- ternately pinnated with denti- 



pojitis 



