SERTULARIA. 



The form of the ftem of this Sertularia is different 

 from all the kinds hitherto known, on account of the 

 arched knots on its ftem : when it is put into water, the 

 two rows of little branches, or pinnas, become nearly 

 ftraight, or incline a little at their ends, with their denti- 

 cles towards each other. I have never yet feen their 

 ovaries, nor any other fpecimen, but that which was col- 

 lected near the harbour of Dublin, part of -which is very 

 exactly reprefented in my Effay on Corallines. An ele- 

 gant fpecimen of this is preferved among my other Zoo- 

 phytes in the Britifli Mufeum. 



14, Sertularia antennina. Lobfter s-horn Coralline. 



Sertularia fur cutis fub- This Coralline has (ingle 



fimplicibus verticillatis^ fe- ftems, but there is a variety 

 tulis denticulis fecundis ca- ■ that is branched. Thefe are 

 lyciformibus^ovariis axilla* furrounded with whirls of 

 ribus pedunculatis oblique briftle-like final! branches, 

 truncatis. which have on the upper (ide 



rows of cup-fhaped denticles ; 

 their ovaries have foot-ftalks, 

 and are obliquely open to- 

 wards the ftem : thefe are 

 placed round it at the infertion 

 of the branches. 



Lobfter s-horn Coralline^ or Sea-Beard. Ellis Corallin, 

 pag. 15. tab. 9. 



Sertularia antennina. Linn. Syft. Nat. Ed. 12. p. 13 10. 



The branched variety of this Coralline is reprefented 

 in the Philofophical Tranfactions, Vol. 48. tab 22. as 

 it appeared alive in fea- water ; and was, in June 1754, 



moft 



