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 pinnae, 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 

 exaclly reprefented in my Effay on Corallines. An ele- 

 gant fpecimen of this is preferved among my other Zoo- 

 phytes in the Britifh Mufeum. 



14.. Sertularia antennina. 



45 



Sertularia fur calls fub- 

 fmplicibus verticillatis^ fe- 

 talis denticulis fecundis ca- 

 lyciformibuS) ovariis axilla- 



Lobfter s-hom Coralliite. 



This Coralline has ftngle 

 ftems, but there is a variety 

 that is branched. Thefe are 

 furrounded with whirls ot 

 ribus pedunculatis oblique briftle-like fmall branches, 

 truncatis. which have on the upper fide 



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. 



Lobfers-horn Coralline^ or Sea-Beard. Ellis Corallin. 

 pag. 1 5. tab. 9. 



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



The branched variety of this Coralline is reprefented 

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

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



moft 



