C. bipartita may be diftinguifhed from C. fordida by the fmaller and remark- 

 ably pellucid filaments of the latter, as well as by their more fimple internal 

 ltru£lure. From C. rivularis it may be known by its different color and mode 

 of growth, and by its longer joints with two veficles in each. Both thefe 

 fpecies however vary, and occafionally approach each other in a furprifing manner, 

 and no other Confervas have ever puzzled me fo much. I have gathered C. 

 rivularis, in fome of the filaments of which there has been a pellucid line run- 

 ning longitudinally through them, as if they were about to feparate in that 

 direction. It alfo frequently happens that the coloring matter in the joints of 

 that fpecies is collapfed alternately on both fides of the filament, fo as to prefent 

 a curious zic-zac appearance, and I once faw the internal veficles of C. bipartita 

 arranged in the fame manner. 



In drying it adheres, though not fo firmly as C. rivularis, to either Glafs or 

 Paper. 



A. C. bipartita, natural fize. 



B. Ditto, magnified I. 



