the former of these it differs in being larger, more rigid, and having ramuli of much greater diameter, so that under the microscope it is impossible to confound them. Its Cape of Good Hope representative, and indeed, very near ally, is the P. setigera, Harv. (Nereis Australis.)
Plate CLXXXYII. — Fig. 1, branch and ramuli ; fig. 2, portion of a ramulus ; fig. 3, another ramulus ; fig. 4, t'avella ; fig. 5, spores from ditto ; fig. 6, tetraspores : — all magnified.
36. CEEAMIUM, Adam.
1. Ceeamium rubrum, Ag. Fl. Antarct. Pt. 1. p. 191.
Hab. Hermite Island, Cape Horn; Falkland Islands, and Christmas Harbour, Kerguelen's Land; very abundant.
These two Ceramia (rubrum and diapJumum) are very widely distributed throughout the temperate regions of both hemispheres : they are also found on the shores of Peru and Brazil.
2. Ceeamium diaphanum, Ag. Fl. Antarct. Pt. 1. p. 191.
Hab. Hermite Island, Cape Horn ; Falkland Islands ; and Christmas Harbour, Kerguelen's Land ; abundant.
37. GRIFFITHSIA, Ag.
1. Griffithsia Antarctica, Hook. fd. et Harv.; filis c<espitosis dichotome ramosis flaccidis, axillis inferioribus patentibus, superioribus acutis, ramis elongatis ramulisque nudis ad nodos constrictis, articulis eylindraceis superne paulo inerassatis, ramorum diametro sextuplo, ramidorum subtriplo longioribus ; — fruetiricatio deest.
Hab. Hermite Island, Cape Horn, and the Falkland Islands ; on rocks.
Fila sub 3 unc. longa, fastigiata, parce ramosa, ramis elongatis, distanter ramidosis, ramulis brevibus. Color roseus : — charts arete adhseret.
Allied to the G. secundiflora, J. Ag., but smaller in all its parts.
2. Griffithsia corallina, Ag. Conf. corallina, Engl. Bot. t. 1815. Hab. Hermite Island, Cape Horn ; dredged up in about seven fathom Mater.
A solitary barren specimen, resembling the British G. corallina, which is also a native of the Mediterranean Sea, Canary Islands, and Cape of Good Hope.
3. Griffithsia equisetifolia, Ag. Conf. equisetifolia, Engl. Bot. 1. 1479.
Hab. Falkland Islands ; (Agardh.)
38. BALLIA, Harv.
1. Ballia Brunonis, Harv. Fl. Antarct. Pt. 1. p. 190.
Yar. 0. Hombroniana, Fl. Antarct. 1. c.
Hab. Hermite Island, Cape Horn; Falkland Islands; Christmas Harour, Kerguelen's Land, and the Crozet Islands ; most abundant; always (?) parasitical.
One of the handsomest, and certainly the most common and widely distributed of the Antarctic Floridea -. its northern limit in the New World is Patagonia, and the Bay of Islands in New Zealand in the Old. With regard to the adoption of the trivial appellation of "Callitricha," which Agardh proposed for this species (under Sphacelaria), it was waived in compliance with the wish of the first discover of the plant, whose name it now bears.
