114 CLASS II. -ORDER I. 



equal throughout its length ; branches numerous, 

 filiform, and united in a head. 

 Caribean sea. 



PYRAMIDAL. 



5. Nesea pyramidaUs. Stem very large at the 

 base, and gradually diminishing as it rises, crowned 

 by some branches of nearly a millemetre in dia- 

 meter, but not so numerous as in the preceding 

 species. 



The Antilles. 



TUFTED. 



6. Nesea dumetosa. Branches short, cylindrical, and 

 irregular ; growing so close as to touch each other, 

 and forming a mass by the desiccation of the gelati- 

 nous substance which surrounds them in a living 

 state ; each branch is more than a millemetre in 

 diameter, and three or four centimetres in length. — 

 Plate 8. fig. 3. a. B. 



The Antilles. 



GALAXAURA. 



Plant-like, dichotomous, articulated, fistular, 

 and cylindrical ; cells, if there are any, are invi- 

 sible. 



Preceding authors have differed in the classification 

 of these Polypidoms, which in their characters ap- 



