Algals.] 



CERAMIACE^. 



25 



Peysonnellia, Dec. 



Sqitamaria, Zanard. 



Ptfrigospermum, Targ. 

 Phyllophora, Grev. 



Proli/era, Stackh. 



Memhrau' folia. Stack. 

 Stenogramma, Harv. 

 Chondrus, Grev. 



Polymorpha, Stackh. 

 Gymnogongrus, Mart. 



Ahnfeldia, Fries. 

 Dasyphlfea, Mont. 



d) Ga.'iterocarpidEe. 

 Dumontia, Lanix. 

 Halymenia, Jgh. 

 Kallymenia, Agh. 



Constantinea, Postels. 

 Ginannia, Mont. 



e'^ Coccocarpidre. 

 Cryptonemia, J. Agh. 

 Gelidium, Lamx. 

 Suhria, J. Agh. 

 Grateloupia, Agh. 



Phoracis, Raf. 

 GJgartina, Lamx. 



MammiUaria, Stack. 

 Chrysymenia, J. Agh. 

 f) Ctenodontidse, Mont. 

 Ctenodus, Kiitz, 

 Notliogenia, Mont. 



Suborder III. — Lomenta- 

 rece. Frond cellular, 

 Ceramidia having pear- 

 shaped gi-anvdes at the 

 base of a cup-shaped 

 envelope, which finally 

 bursts by a pore. 

 Tetraspores scattered 

 within the branches. 



Lomentaria. Lyngb. 

 Chylocladki, Grev. 

 Gastridium, Grev. 



Kaliformia, Stackh. 



Sedoidca, Stackh. 

 Champia, Agh. 



Mertensia, Koth. 

 Laurencia, Lamx. 



Cornea, Stackh. 



Osmund ia, Stackh. 

 Asparagopsis, Mont. 



Lictorla, J. Agh. 

 Bonnemaisonia, Agh. 



Capillaria, Stackh. 



Calocladia, Grev. 



Bouicsia, Grev. 

 Thysanodadia, Endl. 



Deli sea, Lamx. 



Mammea, J. Agh. 



Lenormandia, Mont. 



Suborder IV.' — Rhodome- 

 lece. Frond jointed. 

 Ceramidia as before. 

 Tetraspores enclosed in 

 transformed branches 

 or Stichidia. 



Dasya, Agh. 



Stichocarpns, Agh. 



Rhodonema, Martins. 



Asperocarilon, Grev. 



Grateloupia , Bonnem. 



Ellisiijs, Gray. 



Gaillonu, Bonnem. 



Baillouviana, Gris. 

 Polysiphonia, Ch-ev. 



Hidchinsia, Agh. 



Gra m mita , B onnem . 



Corradoria, Mart. 



Vertcb7-ata, Gray. 



Dicarpella, Bory. 



Brongniartella, Bory. 



Gratiloupella , Bory. 

 Heterosiphonia, Mont. 

 Alsidium, Agh. 



Amphibia, Stackh. 



Bostrychia, Mont. 



Helicothammuin,Ki\tz. 

 Digenea, Agh. 

 Rhodomela, Agh. 



Fuscaria, Stackh. 

 Acanthophora, Lamx. 

 PoUexfexia, Harv. 

 Dictyomenia, Grev. 



Volubilaria, Lamx. 



Spirhymenia, Dec. 



Carpojihylhnn, Suhr. 

 Botryocarpa, Grev. 

 Odonthalia, Lyngb. 



Fimbriaria, Stackh. 

 Rytiphlcea, Agh. 

 Polyzonia, Suhr. 

 Leveillea, Dec. 

 Amansia, Lamx. 

 Ileterocladia, Dec. 

 ^^'Corallinese. 

 Corallina, Tourn. 



TitanephyUi(m,'SaTdo. 

 Jania, Lamx. 

 Ilaliptilon, Dec. 

 Amphiroa, Lamx. 

 Arthrocardia, Dec. 

 Eurytion, Dec. 

 Cheilosporum, Dec. 

 Melobesia, Lamx. 



Agardhia, Mengh. 



Lithophyllum, Philip. 



Spongites, Kiitz. 



Nidlipora, Lam. 



**Anomalophylle3e. 

 Dictyurus, Bory. 



Calidictyon, Grev. 

 Hemitrema, R. Br. 



Martensia, Her. 

 Claudea, Lamx. 



Lamourouxia, Agh. 



Oneillia, Agh. 

 ? Thaumasia, Agh. 



Suborder V. — Sphcero- 

 cnccece. Frond cellular. 



Coccidia enclosing 

 closely-packed oblong 

 gi-anules arising from 

 the base, within a sphe- 

 rical cellular envelope 

 which tinally bursts : 

 Tetraspores in indefi- 

 nite heaps, scattered 

 over the frond. 



Hypnea, Lamx. 

 Plocaria, Nees. 



Gracilarm, Grev. 



Hclmintochortos , Lk. 

 Rhodomenia, Grev. 



Palmaria, Stackh. 



Bifidia, Stackh. 



Ciliaria, Stackh. 

 Heringia, J. Agh. 

 Sphserococcus, Grev. 



Coronopifolia, Stackh. 



Suborder VI. — Delctse- 

 rice. Frond cellular. 

 Coccidiae as before. 

 Tetraspores in definite 

 heaps, or collected in 

 Sporophylls. 



Plocamium, Grev. 



Nereidea, Stackh. 

 Thamnophora, Agh. 

 Aglaophyllum, Mont. 



Nitophyllum, Grev. 



Papyracea, Stackh. 



Dawsonia, Bory. 



Wormskioldia, Spreug. 

 Hymenena, Grev. 

 Delesseria, Lamx. 



Hydrolapatha, Stackh. 



Membranoptera, 

 Solieria, J. Agh. 

 Acropeltis, Mont. 

 ? Hydropuntia, Mont. 



Numbers. Gen. 88. Sp. 682. (Eudl.) 



Position. — Fueacese. Ceramiace^e. — Characese. 



