HARVEY’S ILLUSTRATIONS. 303 
strings of capsules, collected at the apices of the branches 
into little fascicles. In young specimens the change of an 
articulation from its usual form and structure into a perfect 
capsule may be most distinctly seen, examples occurring in 
-every state of transition from the slightly swollen pale-coloured 
joint to the ripe tri-sporous capsule. Here then we have a 
beautiful illustration of the origin of the capsule in this genus, 
for real capsules are formed in precisely the same manner, 
though from different parts of the frond. 
ll. Ceramium fastigiatum (Harv. MS.) ; filis capillaribus 
tenuissimis zequalibus dichotomis fastigiatis, geniculis opacis, 
-articulis inferioribus hyalinis longis, ultimis roseis brevissimis. 
—Conf. fastigiata. Roth, Cat. ii. p. 224. ?— Cer. diaphanum. 
8. arachnoides. Ag. Sp. Alg. v. ii. p. 152.— Cer. diaphanum. 
Wyatt, Alg. Danm. N. 86. i 
In mari Brittanico, ad algas et corallinas, haud rarò.— 
Fila digitalia et ultra, æqualia vel parum attenuata, e basi 
regulariter dichotoma, axillis inferioribus distantibus, superi- 
oribus creberrimis, pluries furcata, fasciculata, apicibus fasti- 
giatis, forcipatisque. Articuli inferiores plerumque diametro 
3—4-plo longioribus hyalinis, superioribus brevissimis roseis ; 
genicula opaca elevata purpurea. Substantia tenera flaccida. 
Cæspitis color atro-purpureus. Brin: 
This species, which, I confess, I offer with some hesitation, 
has usually been considered a variety of C. diaphanum, from 
Which, at the request of Mrs. Griffiths, I now separate it. That 
lady has long watched both species in their natural localities, 
-and is convinced that they are perfectly distinct. If for the 
present, I do not express myself so strongly, I may at least 
say that the characters which distinguish our C. fastigiatum 
appear to me quite as important as those which separate 
some other species of this genus. The filaments are not 
more than half the diameter of those of C. diaphanum, and 
are, moreover, regularly dichotomous from the base to e 
apex, and always level-topped ; whilst in that species r 
filaments divide very irregularly, the main branches are o 
