Index to Plates. 



35. Seed of Tobacco (E.Marks) 139 

 llc:ulicr (Erica ci- 



nerea) (E.Marks) 147 



37. Seed of Ling (E. Marks) ...149 



Purslane ., 135 



Sweet William (E. 

 Marks) 129 



40. Seed of Cornflower (E. 



Marks) 151 



41. Seed of Eucharidium 152 



Indian Pimpernel... 153 



Foxglove 155 



Lousewort 156 



Verbena 157 



Small Snapdragon... 159 

 Oxalis rosea 160 



19. Dfismid, Penium Brebissonii 189 



Docidiumbaculum,. 191 

 Closterium lumda.. 192 

 Closterium Ehren- 

 bergii 193 



23. Desmid, Closterium monili- 



ferum 194 



24. Desmid, Closterium striola- 



tum 195 



25. Desmid, Spirotxnia conden- 



sata 197 



20. Diatom, Epithemia turgida. 193 



Eunotia tetraodon 201 

 Himautidium bi- 

 dens 202 



29. Diatom, Meridian circulare 



(H. F. Ilailes) 204 



30. Diatom, Odontidium muta- 



bile 205 



31. Diatom, Fragilaria capu- 



cina 20S 



32. Diatom, Vialomavidgare... 210 



Amplripleura pel- 



tucida 215 



34. Di&lom,X"ttzsehiasigmoidea 213 

 Synedra capitata ... 217 

 Surirellalinearis... 221 

 OrtJiosira orichal- 

 cea 226 



PLATE IV. 



1. Diatom, Cywatopleuraellip- 



tica (H F. Ilailes) 219 



2. Diatom, Campylodiscus par- 



vulus 270 



3. Diatom, Orthosira arenaria 227 



4. Aclmanthidium 

 lanceolatum 231 



5. Diatom, Cymbella cuspidata 232 



6. Cocconema lanceo- 

 latum (H. F. Hailes) 233 



7. Diatom, Gomphonema cam- 



tatum 230 



8. Diatom, Navicula rhom- 



boides 239 



9. Diatom, Pinnularia viridis 247 

 10. Encyonema ccespi- 



tosum .... 234 



ll.Ho. Diatom, Cydotella Kut- 



zinyiana 225 



12. Diatom, Coscinodiscus ra- 



diatus .... 274 



