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Sub-order 2. ACHNANTHOIDE^E . . 289 



Family 1. Achnanthaceae 

 Achnanthes 



Family 2. Cocconeidacese 

 Cocconeis 



Sub-order 3. NAVICULOIDE.E . 291 



Family 1. Naviculacese . 



Navicula, Stauroneis, Vanheurckia, Ampbipleura, Gyro- 

 sigtna, Amphiprora, Mastogloia 



Family 2. Gomphonemacese . 29 ~ 



Gomphonema, Rboicosphenia 



Family 3. Cocconemacese 



Cocconema, Amphora, Epithemia 



Sub-order 4. NITZSCHIOIDE^E . 301 



Family 1. Nitzschiacese 



Bacillaria, Nitzschia, Hantzschia 



Sub-order 5. SURIRELLOIDE^ . 303 



Family 1. Surirellaceae . . 303 



Cymatopleura, Surirella, Campylodiscus 



Class 6. MYXOPHYCE^, p. 306. 



Sub-class 1. GLAUCOCYSTIDE.E . . 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. Stigonemaceae . 319 



Stigonema, Hapalosiphon 



Family 2. Scytonemacese . 322 



Microchrete, Scytonema, Tolypothrix, Desmonema, Diplo- 

 colon 



Family 3. Nostocaceas 324 



Nostoc, Anabtcna, Aplianizomenon, Nodularia, Cylindro- 

 spermum 



