the peripheric ramuli are of such large size, so much distended, 

 and so glassy, that at first sight it might be taken for a Valonia. 

 The centre is very gelatinous, the filaments inextricably inter- 

 woven, and the balls contain so much slime that they are a 

 long time in drying. I once or twice found the frond attached, 

 but usually there is no mark on the surface by which one point 

 more than another can be recognized as base or apex. Proba- 

 bly after a time it becomes detached and floats freely in the sea 

 as Cladophora jEgagropila does in fresh-water lakes. The fruit 

 remains a desideratum. 



Kg. 1. Codium mamillosum. 2. The same cut across : — both figures of the 

 natural size. 3. Portion of the periphery and central filaments, — magnified. 

 4. Two peripheric branches, — more highly magnified. 



