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Sub-order 2. ACHNANTHOIDE^E 289 



Family 1. Achnanthacese 289 



Achnanthes 



Family 2. Cocconeidaceae 290 



Cocconeis 



Sub-order 3. NAVICULOIDE^E '291 



Family 1. Naviculacese 291 



Navicula, Stauroneis, Vanheurckia, Amphipleura, Gyro- 

 sigma, Amphiprora, Mastogloia 



Family 2. Gomphonemacese 297 



Gomphonema, Rhoicosphenia 



Family 3. Cocconemaceae 298 



Cocconema, Amphora, Epithemia 



Sub-order 4. NITZSCHIOIDE^E . . .. . . . 301 



Family 1. Nitzschiaceae 301 



Bacillaria, Nitzschia, Hantzschia 



Sub-order 5. SURIRELLOIDEJE .'..... 303 



Family 1. Surirellacese 303 



Cymatopleura, Surirella, Campylodiscus 



Class 6. MYXOPHYCE^E, p. 306. 



Sub-class 1. GLAUCOCYSTIDEJE 316 



Family 1. Glaucocystacese 317 



Glaucocystis, Chroothece 



Sub-class 2. ARCHIPLASTIDE^E 317 



Order I. HORMOGONE^E 318 



Sub-order 1. PSILONEMATE^E 319 



Family 1. Stigonemacese . . . - . . . . 319 

 Stigonema, Hapalosiphon 



Family 2. Scytonemaceae 322 



Microchaete, Scytonema, Tolypothrix, Desmonema, Diplo- 

 colon 



Family 3. Nostocacese 324 



Nostoc, Anabsena, Aphanizomenon, Nodularia, Cylindro- 

 spermum 



