6o Natural Hiftory 



them, as the Land-Plants are to their kinds ; but then, it is 

 as commonly obferved, that they fare much ahke, that is, 

 they periOi and decay. 



The Herring-bone CoralUne defcribed at Fig. a, Plate X. 

 refembles thefe Keratophyta in the Manner of its Growth very 

 nearly, except in the IncruHiation, and is a miniature Figure 

 of that pennated Species, called in the WeJl-hicUes the Sea- 

 Feather. , 



In order to fhew the great Affinity there is between the 

 Strudure of the pennated Keratophyta^ and the veficulary 

 Corallines with Denticles, I fhall here give a fliort De- 

 fcription of a curious one from Sardi7iia^ called the Sea- 

 Feather, which I lately met with in the curious CollecTtions 

 of Mr. Bahr^ and Mr. Pond^ Fellows of the Royal So- 

 ciety. 



This beautiful marine Produdion is about a Foot high r 

 The fmall Phmce, or Side-Sprigs, are placed alternately op- 

 pofite to each other, in a regular Order on each Side of the 

 main Stem. Thefe are furniflied with feveral little Clufters 

 of fmall Tubercles placed at equal Diftances, and furround- 

 ing the Stem generally three together. When they are mag- 

 nified, they have much the Appearance of the bearing Buds 

 of Fruit-Trees. In this dry Specimen tht;ir Tops bend in to- 

 wards the Stem of the Branch that fupports them. 



The whole Surface is covered over with a calcarious Sub- 

 ftance, like mofl: of this Clafs. 



Fig. S, in Plate XXVI. reprefents one of the Ramifications, 

 with the main upright Stem ; this, we may obferve, has a 

 very near Refemblance to the Form of the Sea-Fir Coralline, 

 Plate I. Fig. b-, pag. 4.. 



Fig. 



