Alffa.] 



ELOBA OE NEW ZEALAND. 



257 



Hab. Port Cooper;, Akaroa, and Otago, In/all. (Cape of Good Hope and Northern Atlantic.) 



6. Ceramium uncinatum, Harv. ; fronde ultracapillari regulariter dichotoma fastigiata, axillis patentibus 

 apicibusque forcipatis, articulis inferioribus diametro 3-4-plo loiigioribus interstitiis pellucidis nudis, ge- 

 niculis nodoso-elevatis spinula singula articulata subulata uncinato-recurva crassa exteriore latere necnon 

 spinella (nunc obsoleta) interiore latere opposita armatis, tetrasporis . . . 



Hab. Cook's Straits, Lyatt. Cape Turnagain, etc., Colenso. 



Allied to 0. acanthonotum, but much more robust, with strongly swollen nodes and recurved or hooked thorns, 

 and very frequently furnished with a minute thorn on the inner face of the branch. We consider it a distinctly 

 marked species. 



Gen. LXXXIX. CENTBOCEBAS, Kiitz. 



(Kiitz. Linnsea, 1841, p. 741. Phyc. Gen. p. 381. Sp. Alg. p. 688. J. Ag. Sp. Alg. ii. 147. Harv. Ner. Bor. 



Amer.pt. 3. f. 211.) 



1. Centroceras clavulatum, Mont. Fl. Alg. p. 140. J. Ag. Sp. Alg. v. 2. p. 148. Harv. Ner. Bor. 

 Amer.pt. 2. p. 211. t. 33 C. Ceramium clavulatum, Ag. Mont. Cuba, t. 2.f. 1. 



Hab. Common on the coast, Colenso, Lyatt, etc. (Tropical and subtropical seas.) 



Gen. XC. PTILOTA, Ag. 



(Sp. Alg. i. 384. Endl. 3rd Suppl. p. 36. Mont. Voy. Pole Sud, p. 97. Hook. fil. et Harv. El. Ant. i. 190. 

 J. Ag. Sp. Alg. ii. 92. Ptilota, PJwdocallis, et Muptilota, Kiitz.) 



1. Ptilota formosissima, Mont., Voy. Pole Sud, p. 97. t. §.f. 3. Hook. fil. et Harv. Fl. Ant. v. l.p. 190. 

 t. 77. J. Ag. Sp. Alg. v. 2. p. 102. Euptilota formosissima, Kiitz. Sp. Alg. p. 671. 



Var. /3 ; ramis circumscriptione lineari-lanceolatis. 



Hab. Yery abundant, Lyatt, Colenso, etc. (Auckland Islands.) 



2. Ptilota pettucida, Harv. ; fronde filiformi disticha decomposite pinnata, ramis primariis apicem versus 

 ecorticatis bi-tripinnatis, pinnis articulatis monosiphoniis oppositis insequalibus, una indivisa, altera pin- 

 natim partita vel unilateraliter pectinata, pinnellis filiformibus basi constrictis subacutis, articulis diametro 

 sesqui-duplo-longioribus. 



Hab. Otago, and East Coast of Southern Island, Lyatt. 



Frond 2-3 inches long, ovate in outline, closely branched, and three or four times pinnate. Primary branches 

 alternate, each of them opposed by a minute, undivided ramulus, or by a very short, simply pinnate branchlet, which 

 is rarely more than two or three lines long ; oppositely bi-tripinnate, one pinna of each pair being constantly de- 

 veloped and compound, the other either very much smaller and less compound, or remaining unchanged as a simple 

 ramulus. The upper portion of the branches for some distance below the apex is visibly articulated, and nearly 

 ecorticated, and the smaller branches are still more pellucid, the rachides of the penultimate pinna? being destitute 

 of cortical cells. Articulations of the pinnae once and a half to twice as long as broad. Fruit unknown. Colour 

 bright rosy-red. — A beautiful species, allied to P. Harveyi, but more pellucid, with longer articulations, and a dif- 

 ferent ramification. It also seems related to the Callithamnion Ptilota of ' Elora Antarctica,' the favellse of which 

 are unknown, and which is probably a Ptilota. We dare not, however, at present unite it to that species, of which 

 we possess but very imperfect specimens. 



Gen. XC1. BALLIA, Harv. 



(Harv. in Hook. Lond. J. Bot. ii. 191. Mont. Voy. Pole Sud, p. 94. Hook. fil. et Harv. El. Ant. i. 190. 

 J. Ag. Sp. Alg. ii. 74. Kiitz. Sp. Alg. p. 663.) 



1. Ballia callUricha, Mont., Pole Sud, p. 94. Kiitz. Sp. Alg. p. 663. /. Ag. Sp. Alg. v. 2. p. 75. 

 VOL. ii. 3 v 



