xiv Contents 



PAGE 



Sub-order 2. ACHNANTHOIDE^E 289 



Family 1. Achnanthaceae 289 



Achnanthes 



Family 2. Cocconeidaceae 290 



Cocconeis 



Sub-oi-der 3. NAVICULOIDE^E 291 



Family 1. Naviculaceae 291 



Navicula, Stauroueis, Vanheurckia, Amphipleura, Gyro- 

 sigma, Amphiprora, Mastogloia 



Family 2. Gomphonemacese 297 



Gomphonema, Ehoicosphenia 



Family 3. Cocconemaceae 298 



Cocconema, Amphora, Epithemia 



Sub-order 4. NITZSCHIOIDE.E 301 



Family 1. Nitzschiaceae 301 



Bacillaria, Nitzschia, Hantzschia 



Sub-order 5. SURIRELLOIDE.E ...... 303 



Family 1. Surirellaceae 303 



Cymatopleura, Surirella, Campylodiscus 



Class 6. MYXOPHYCE.E, p. 306. 



Sub-class 1. GLAUCOCYSTIDE.E . 316 



