240 i Transactions. — Botany. 
C. gemmiferum, Brébisson. 5. 
Fig. 4. 
A large, handsome species, of the general appearance of C. margariti- 
ferum, covered with conspicuous pearly granules, but differing by having on 
each segment, at the middle, on both surfaces, a rounded protuberance 
bordered with granules, which is best seen in end view. (Pritch. Inf., 
p. 738.) 
The typical plant has slightly truncate ends; in our species the trunea- 
tion is sometimes not apparent. - 
Seemingly not uncommon in Hawke’s Bay. The European species has 
only been found, I think, in France. 
C. obsoletum, Hantzsch, var. punctatum, var. nov. B. 
Fig. 5. 
Frond in front view almost circular, the breadth perhaps a little more 
than the length. Edge smooth. Constriction deep, narrow, linear. Seg- 
ments broader than long, with a minute, bluntly-triangular process on 
each at the entrance of the constriction on each side; processes convergent, 
pointing slightly outwards. End view elliptic, showing the processes. 
Surface of frond distinctly punctate. Diameter in front view, 60-65 p. 
Zygospore unknown. 
Not uncommon in gatherings from Hawke’s Bay. 
Professor O. Nordstedt, in a paper which he has kindly sent me on some 
Alge in the museum of Lund, figures a species from Jaya—C. obsoletum, 
Hantzsch, closely resembling the above. The same plant is found in. 
Rabenhorst (Flor. Alg., sect. iii, p. 227) as Arthrodesmus obsoletus, asvariety 
of A. convergens, Neither author, however, gives more than the very briefest 
description. But Prof. Nordstedt's figure clearly shows his plant quite 
smooth, without puncta. In other respects I see no difference, and I think 
the puncta are not sufficient to raise our plant above the position of a 
variety. 
C. speciosum, Nordstedt, var. inflatum, var. nov. 
Fig. 6. 
Frond in front view elliptical, the ends not at all or very slightly com- 
pressed ; segments longer than broad, sides convex; constriction deep, 
narrow, linear. Segments when empty showing rows of minute semi- 
orbicular granules, the rows apparently radiating from the centre of each 
segment, but not reaching quite to it, so that the median space would be. 
smooth if it were not for a number of longitudinal rows of smaller granules, 
which aes being slightly eurved and not all in focus at once, testify to the 
presencé of a centralinflation. "The result of the two sets of granules is to 
