times forked ramelli. Articulations of the ramuli thrice, of the ramelli 
4—5 times as long as broad. Jrwit unknown. Colour of the stem and 
branches dark red; of the ramuli rosy. Substance of the stem and branches 
cartilaginous, rather rigid; of the ramuli very soft and flaccid. In drying 
the plant adheres pretty freely to paper. 
LLL Eee 
A rare species, and only found, so far as I know, on the 
vesicles of A/acrocystis. It is at present doubtful whether this 
plant belongs to Callithamnion or to Wrangelia ; or whether it 
may not prove to be a species of Ziamnocarpus, if that genus is 
to be kept up. ‘There is a greater solidity and opacity of stem 
and branches than is common in Callithamnion, and the articu- 
lated ramuli are wholly out of proportion, in development, to the 
rest of the frond, though scarcely quite so much so as in Zham- 
nocarpus. ‘These ramuli, when the plant is steeped long in fresh 
water, turn to a dull green, but do not decay, while the rest of 
the frond retains its red colour: another circumstance anomalous 
in Callithamnion. 
I trust that some of the active algologists of Victoria may dis- 
cover the fruit, of both kinds, and thus enable us to fix the genus 
of this interesting Alga. 
Fig. 1. CALLITHAMNION PENICILLATUM, growing on a vesicle of Macrocystis, 
—the natural size. 2. Frustule of a branch, bearing one of the byssoid 
pencilled ramuli. 3. A ramellus from the same. 4. Transverse section of a 
branch. 5. Longitudinal section of the same :—the latter figures variously 
magnified. 
