water, which exhibit the same peculiarity of structure, but it 
does not seem to have hitherto been noticed.” —Thw. M/S. 
Fig. 1. SpumrozyGa BERKELEYANA; filaments :—magnified 250 linear. 
Puate CLXXIII. C. 
SPERMOSIRA HARVEYANA, Zw. is. 
Grn.Cnar. “Same as that of Spherozyga, except that each filament is 
enclosed in a very delicate, membranous sheath.”—Thw. 
Spermosira Harveyana ; “filaments much curved, composed of cells nearly 
as long as broad: spores exactly spherical, almost twice the diameter 
of the cells: connecting cells subquadrate, rather longer than wide, 
and of the same width as the ordinary cells.” —Zhw. 
Has. Occurring intermixed with Spherozyga Broomei, at Shirehampton, 
near Bristol. June, 1847. Mr. G. H. K. Thwaites. 
“This beautiful species differs from the Spermosira hitorea, 
Kiitz., figured in [our] Plate CXIII., in its spores being not at 
all compressed, and its ordinary cells much longer compared with 
their width. The membranous sheath investing the filament is 
with difficulty seen, and the plant bears considerable resemblance 
to some species of Spherozyga. ‘he curved filaments and sphe- 
rical spores render it not very unlike MJonormia intricata, Berk., 
from which it is, however, perfectly distinct’’— 7iw. MS.* 
Fig. 1. C. SpermMosira Harveyana :—inagnified 250 linear. 
* Tam indebted to my friend G. H. K. Thwaites, Esq., of Bristol, for the 
drawings copied in Plate CLXXITI., and the accompanying descriptive characters. 
I have also to return him my thanks for the honour he has done me in naming 
the Spermosira ; but especially for the hearty expressions which accompanied the 
* patent.” Writing to congratulate me on a recent appointment, after the 
kindest expressions, he concludes by saying, ‘‘ Do let me, in honour of the occa- 
sion, call the beautiful new Spermosira, of which I have just sent you a sketch, 
S. Harveyana, and thus pay the first tribute of respect, of this kind, to you in 
your new capacity.” 
