the light.” The same specimens are described by Greville thus :-— 
“Filaments hyaline, yellowish, exceedingly slender, elongated, 
flexible, scattered,” “neither fasciculate nor tufted.” ‘Thus what 
Carmichael sees opake and snow-white, Dr. Greville describes as 
hyaline and yellowish. If we further contrast the words of the 
several descriptions, other as striking discrepancies will be seen. 
So that, had I not received authentic specimens of the original 
plant, named by Carmichael himself, I should not have hesitated 
to regard his description as drawn from another species; I can 
now only attribute the differences to a defective microscope. It 
should be stated, however, that I have only seen this plant im a 
dried state, when its colour may have altered from white to green. 
Under the higher powers of the microscope the green endochrome 
(of the dried specimen) is very obvious; the “ yellow and ;hya- 
line” character mentioned by Greville, has reference to the 
empty tube, from which the colourmg matter has been dis- 
charged. I have only seen Carmichael’s specimen, but as he 
found it abundantly at Appin, it is probably still to be met with 
on that coast, and is worth looking after. 
Fig. 1. Small fragment of ENTEROMORPHA CLATHRATA, with CALOTHRIX LU- 
TEOLA infesting it :—the natural size. 2. The same:—highly magnified. 
3. Portions of threads of the Calothrix:—more highly magnified. 
