with slender, divaricating, many times forked or irregularly multifid ramuli. 
These are $ to 4 inch long, as thick as bristles, irregularly intermixed, long 
and short together, and spreading to all sides. No fructification observed. 
The colour is a very dark, red-brown, becoming nearly black in drying. The 
structure is that proper to the genus, the peripheric layer being very largely 
developed. The substance is rigid, almost wiry when dry, in which state the 
plant does not adhere to paper. 
The genus <Areschougia bids fair to be an extensive one, if we 
may Judge, not merely by the several species with which we are 
already acquainted, but by the extreme difference in aspect and 
habit that obtains between different members of the genus. 
Compare, for example, the three species already figured in this 
work (Plate XIII., CX VII., and CLXVI.) with the present Plate ; 
and though there will be observed a similarity in internal struc- 
ture of frond, there is not much else to indicate a bond of con- 
nection between them. What a number of “ intermediate forms ” 
it would take to connect by a series of small transitions the A. 
australis (Plate XIIL.), on which the genus was originally founded, 
and our 4. dumosa here figured. Possibly, however, for we do 
not yet know the fruit of 4. dumosa, no such series exists or 
has existed, and the resemblance in cellular structure may be 
one of analogy and not of affinity. Assuredly I never was more 
surprised, on first examining Mr. Watts’s speeimen, than to find 
the cross cutting (Fig. 3) so completely similar to that of 4. 
sedoides (Plate CXVIT., Fig. 2) as to compel me to associate 
these plants in the same genus. I trust Mr. Watts may be so 
fortunate as to find specimens in fruit, and so to complete the 
history of this very distinct and curious Alga. 
Fig. 1. Argescnovera pumosa,—the natural size. 2. Apex of a branch, with 
some of the multifid ramuli. 3. Transverse section of the same :—magnified. 
