Holmes . — New Marine Algae. 
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Microcoelia KALLYMENIOIDES, n, sp. 
Fronde breviter stipitata late expan sa gelatino-carnosa, obliquo- 
lanceolata vel reniformi , ad 12 poll, longa , 3-4 poll, lata , 
margine in tegro-subincrassata ; sphaerosporis tripartite divisis , 
772 strata corticali immersis, per totam super ficiem spar sis ; colore 
coccineo-purpureo. 
Hab. Near the mouth of the Kowie River, 1883, Dr. H. 
Becker. This genus is as yet- only represented by a single 
species from Chili (. Microcoelia chile nsis). 
Externally, the African species bears a singular resemblance 
to Kallymenia reniformis , and but for its dull brownish red 
tint, might almost be taken for an old specimen of that plant. 
Microcoelia , however, differ from the genus Kallymenia , as 
pointed out by Agardh, in the presence of a series of gradually 
smaller horizontally placed cells between the large central cells 
of the frond and the cortical layer. From Callophyllis , which 
the structure somewhat resembles, it differs in the very 
gelatinous and badly defined walls of the larger cells, and 
from both genera in the tripartite tetraspores, which have 
not been found in M. chilensis. 
The nearly sessile fronds arise in a cluster of three or four 
from the base, which is imperfect. On the margin of the 
frond where it is injured, small rounded obovate short-stalked 
proliferations are formed, which indicate that the adult plant 
also possesses a short stem. In outline the young basal 
fronds are lanceolate, but the older ones are more reniform 
than lanceolate, one side of the frond being much more 
developed than the other. The internal structure of the 
frond agrees well with that of Microcoelia , as described by 
Agardh. In the centre of the frond, there are large cells 
parallel to the surface, with gelatinous badly defined walls, 
followed by two or three rows of gradually smaller cells, the 
cortical layer being thin and composed of minute cells vertical 
to the surface. The tetraspores are apparently formed from 
the cortical cells (which alone are coloured), but occupy 
cavities formed partly in the cortical, and partly in the sub- 
