CHLOROSPERME.%. 27 
gated, owing to the endochrome being separated here and there by empty 
spaces, as though the tubes were indeed only half full, a character so 
peculiar and constant, that it is referred to in its specific name. Calothriax 
confervicola infests some species of conferva, and also other small alge in 
shallow tide pools. This plant is composed of little star-like tufts seldom 
more than a quarter of an inch long, but crowded on the branches of the 
seaweed, on which they are parasitic to such an extent, as sometimes to 
obscure every portion of it but the root. Little tufts of this parasite are 
represented at b, in Fig. 29, growing on Ceramium rubrum, and above it are 
two cells of the ceramium with the basal part of three filaments of the 
Calothriz highly magnified, to show its simple structure. 
There are several other species of Calothriz still more minute and not so 
common as C.confervicola,and in addition to these two last described genera, 
there are some others containing very interesting species; but as several 
of them are found chiefly in brackish ditches oftener than in the sea, and 
others are inhabitants of fresh water streams or the margins of waterfalls, 
I shal), for the present, bid adieu to the Chlorosperms, and enter in my 
next section on a description of the Melanosperms or olive seaweeds. 
nye Glarn— . 
