with another series of similar conceptacles of a smaller size; in these (fig. 3.) 
I have observed ¢rispores (fig. 4). 2, hemispherical conceptacles, of a very 
minute size, resembling grains of sand, plentifully scattered, like warts, 
over the surface, hollow, exhibiting (when the calcareous matter is removed) 
a beautifully tessellated surface, and containing a tuft of crescent-shaped, — 
transversely parted tetraspores (fig. 8). When the frond is macerated in 
acid, the lime is dissolved, and the joints exhibit regular transverse bands, 
and a longitudinal section shows the substance to be composed of very 
slender, perpendicular, elongated, cylindrical cells, alternating with smaller 
ones, and the outer ones, curving outwards at the tips, and ending at the 
circumference in a minute cell. Colowr, a dark purple, soon fading on 
exposure. 
This species was noticed at an early period, and has been 
generally kept separate from C. officinalis, which it closely re- 
sembles, by most authors who have written on the subject. It 
differs from C. officinalis chiefly in the form of the upper joints 
of the stem and branches, which are broad and flat, with promi- 
nent and usually sharp angles. As far as my experience goes, 
these characters are pretty constant. 
The greatest anomaly which I have observed in this plant, is in 
the fructification, and this is so remarkable that had I not found 
it on specimens from the same locality, and otherwise the same, 
I should have been afraid to describe plants with such different 
fruit as identical. There appear to be three distinct forms of 
Ceramidium borne by C. squamata; the first, that proper to the 
genus, and which I have not found on the specimens figured : 
secondly, that proper to Jania (fig. 2, 3); and thirdly, that pro- 
per to Amphiroa (fig. 7). These two last I have found abun- 
dantly both on French and Irish specimens. Both the latter 
kinds of Ceramidium contain tetraspores, but those found in one 
of them are deficient in one jomt. It is rather unfortunate for 
the stability of the genera into which the Linnzean Coradlina has 
been split, to find an acknowledged species of one of the genera 
producing the fruit attributed to do/h the others ! 
Fig. 1. Coratnina sauamata :—of the natural size. 2. Apex of a fertile 
branch, with wrn-shaped conceptacles. 38. A conceptacle, bearing two 
lesser ones. 4. Zrispores from the same. 5. A branch with wart-like 
conceptacles, in its natural state. 6. The same, treated with acid, the lime 
being removed. 7. Terminal joints with fruit, from the same, showing a 
longitudinal section of the joint, and the interior of one conceptacle. 8. 
Tetraspores. 9. Basal joints. 10, 11. Cells of which the frond is built up: 
—all more or less highly magnified. 
