G. AETEA. 65 



form of a horn, with an oblique opening, having a 

 cil shorter than the cell. Plate 3. fig. 5. A. 

 European seas. 



AETEA. 



Polypi DOM, with a rampant and branching stem ; 

 cells solitary, opaque, and tubular, in the form of 

 clubs, and arched ; opening at the side. 



This Polypidom appears to unite the present Or- 

 der with that which follows, having a rampant stem 

 from which the cells issue ; but it differs essentially 

 from the second Order, in the form of its undulated 

 stem, which is branched and swelled at stated dis- 

 tances, and also in the form of its cells ; it is therefore 

 truly an intermediate species. 



This genus as yet comprises only one species, 

 very common on the marine plants of the European 

 seas ; they embellish these vegetables by the pearly 

 whiteness of their cells, which forms a beautiful con- 

 trast with the brilliant red of the Plocamis, on which 

 the Aetea anguina is frequently found : one might ima- 

 gine them many-clefted leaves of red coral, covered 

 on all parts with hairs of silvery white. 



SERPENTINE. 



1. Aetea anguina. Described in the genus : is 

 found both in the European and Australasian seas. — 

 Plate 3. fig. 6, A. 



Cor. I 



