ALt;ALS.] 



CONFERVACE.i:. 



in 



Tribe 2. Acetabula- 

 TidsB.-- Frond monosipho- 

 nous, jointed, icith ra- 

 diating or flahelliform 

 branches at the end ; the 

 branches continuous, se- 

 parate, or combined. 



Poh-phisa, Lamx. 

 Acetabularia, Lamx. 



Acetabulum, Tourn. 



Callopilophoruin, Don. 



Olivia, Bert. 

 Rhipidosiphon, Mont. 



Tribe 3. Halymedidse. 

 — Frond poli/siphonous, 

 made up of tubes which 

 are continuous or joint- 

 ed, and branched more or 

 less denseli/. 



Udotea, Lamx. 



Flabellaria, Link. 



Rhipozonium, Kiitz. 

 Avraim-illaea, Dec. 

 Halymeda, Lamx. 

 Penicillus, Lamx. 



Nesea, Lamx. 



CoraUiodendron, Ktz. 

 Espera, Dec. 

 Anadyomene, Lamx. 

 ? Dictyosphaeria, Dec. 

 Tetraspora, Dec. 



Pexisperma, Raf. 

 Bangia, Lynpb. 



Spermagonia, Tiormem. 



Prasiola, Menegh. 

 Stigoneroa, Ag. 



Girardia, Gray. 

 Zignoa, Trevis. 



Percursaria, Bory. 



Numbers. Gen. 66. Sp. 368. (Endl.) 



Enteromorpha, J. Ag. 

 Ulva, Ag. 



Enteromorpha, Lk. 



Ilea, Fries. 



Hydrosolen, Mart. 



Tubxdaria, Rouss. 



Fistularia, Grev. 



Ulvastnim, D. C. 



Halithridax, Targ. 



Ramidaria. Rouss. 



Phylhma, Wigg. 



Trepposa, Lk. 

 Porphyra, Ag. 



Position. — Diatomaceae, Confervace.e. — Fucaceee. 



C2 



