branched, so that its tufts are more bushy and feathery. It 
frequently les prostrate, forming a widely spreading fleecy 
covering either to rocks or to mud, but this character is not 
very constant. ‘To Hut. erecta (Plate XLII.) it is also very 
closely allied, but is of less plumy habit than that species, with 
less difference in diameter between the main stems and branches 
and their lesser divisions, and the ramuli are shorter and more 
squarrose. Still, it must be confessed that there is a greater 
resemblance between these three species, in microscopic cha- 
racters, than a species-maker would desire ; and I remain of the 
opinion formerly expressed, that no great violence would be done 
to truth by regarding them all as forms of one Protean species. 
Fig. 1. EnteromorpHa cCLATHRATA ;—Tuft the natural size. 2. Part of a 
branch :—magnified. 3. One of the ramuli :—highly magnified. 
