simple stems, destitute of branches, and merely clothed with patent subulate ramuli, rise from creeping filaments; such individuals are from -i-l inch high. But, when larger, lateral branches begin to be developed, in every respect similar to the main stem. In one specimen, i inches long, which alone is in fructification, the branches are 1-1- inch in length. The variety /3 is a remarkable one, and possibly a distinct species, it is smaller and slenderer, with the branches much curved and the ramuli very generally secund.
Plate LXXVI. Fig. II. — 1, portion of a branch; 2, the same with ceramidia; 3, section of stem; 4, ceramiclium ; 5, spores : magnified.
7. Polysiphonia decipiens, Mont.; "csespitosa, fragilissima, filis cylindraceis subcontinuis fusco-nigris irregulariter virgato-ramosissimis, ramuJis erectis, spinis subulatis spiraliter alternis strictis, articulis diametro multoties brevioribus ex siccatione collapsis 3-5-venosis; fructu .... ?" Mont. Prodr. Phyc. Antarct. p. 5. Voy. au Pole Sud, Bot. Crypt, p. 131.
Hab. Lord Auckland's group. {Admiral JJfUrville.)
8. Polysiphonia cladosfephis, Mont. ; " filo primario articulato polysiphonio vage ramosissimo fusco-purpureo nigrescente, ramis conformibus e geniculis ramellos verticillatos dichotomos monosiphonios dense imbricatos emittentibus, fructu .... ? " Mont, in Ann. des Sc. Nat. (Nov. 1843), p. 39. Toy. au Pole Sud, Bot. Crypt, p. 132. t. 13. f. 4.
Hab. Lord Auckland's group. (Admiral If Urville.)
Apparently nearly related to P. byssoides, Grev., and still more closely to P. byssoclados, Harv. (Griffithsia australis, Ag.)
15. JANIA, Lamour.
1. Jania Hombronii, Mont., Voy. an Pole Sud, Bot. Crypt, p. 146. Hab. Lord Auckland's group ; on rocks in the sea, abundant. What we take for Montagne's plant much resembles the Corallina officinalis, L.; we are not, however, well versed in these vegetables, which have only recently been skilfully investigated by Decaisne.
16. LAURENCIA, Lamour.
1. IjA.v~KESCiA.pinnatifida, Lamour.; var. y, angusta. Fucus Turn. Hist. Fuc. vol. i. p. 40.
Hab. Lord Auckland's group ; on rocks in the sea.
17. DELESSERIA, Lamour.
1. Delesseria crassinervia, Mont.; caule alato ramoso, foliis lineari-lanceolatis e costa valida proliferis, capsulis in costa sessilibus, soris spheerosporarum bnearibus costee parallelis. D. crassinervia, Mont. Prodr. Phyc. Ant. p. 1.
Hab. Lord Auckland's group and Campbell's Island.
We have some doubts as to the validity of this species, which differs from B. Hypoglossum only in the comparative breadth of its costa; a somewhat inconstant character, being, at times, excessively broad, covering nearly the whole lamina, at others, nearly, if not quite, as narrow as in D. Hypoglossum. These intermediate forms do not exist among our Campbell's Island individuals, but in those from the Falklands.
2. Delesseria dichotoma, Hook, fil.et Harv.; costa crassa dichotoma frondem cuneatam obtusam v. emarginatam dernurn bifido-laciniatam percurrente infra apicem evamda, frondibus e costa denudata orien-
