G. AGLAOPHENIA. 71 



plants ; they arc almost always found attached by long 

 and numerous filaments to the solid sands or rocks 

 of the Mediterranean and European oceans ; they 

 seem to prefer deep waters. 



ANTENNINE. 



1. Nemertesia antennina. Ramifications verti- 

 cillated, simple and setaceous; stem simple or very 

 little branched. 



European seas. 



N. B. It is a rare thing to find this species 

 branched ; and when so found, the number of branches 

 is confined to one or two, seldom more. 



JANTNE. 



2. Nemertesia Janini. Stem a little branching ; 

 verticils very distant from each other; slender bristles, 

 very long. — Plate 4. fig. 3. a. B. C. 



Bay of Cadiz. 



BRANCHING. 



3. Nemertesia ramosa. Stems branching ; ver- 

 ticils approximate. 



European seas. 



AGLAOPHENIA. 



Plant-like and homy ; furnished through the 

 whole length, and on the same side, with axillary or 

 isolated cells. 



