\V. WEST AND G. S. WEST : ALGA-FLORA OK YORKSHIRE. 



liyalotheca, Genus... 

 Hydrodictyoii, Genus 

 llydiogastiaceae, Family 

 Hydruracea?, Family 

 Ilydrurus, Genus ... 

 Ilyndmanni, Epilhemia 

 Hystii.x, Scenedesmus 

 impressulum, Cosmaiium 

 incavatum, Euastrum 

 incisa, Eunotia 

 inconspicuum, Cosmaiium 



Penium 



incrustans. Sphterogonium 

 incurvum, Closlerium 

 Incus, Arlhrodesmus 

 Ineffigiata, Genus ... 

 inflata, Denticula 



Navicula 



Spiiogyra 



inflexum, Staurastrum 

 informe, Stigonema . . . 

 infusionum , Dactylococcus 



Glreocystis 



inornalum, Cosmarium 

 insigne; Euastrum ... 



■ Gomphonema 



Zygnema 



insignis^ Spirogyra ..■ 



Urococcus ... 



insulare, Euastrum ... 

 integra, Navicula 

 integrum, Cosmarium 



Pediastrum 



intermedia, Bulbochtete 

 intermedium, Closterium 



Cosmarium 



interrupta, Geminella 



Pinnularia 



interruptum, Penium 

 intestinalis, Enteroraorpha 

 intricatum, Gomphonema 

 intricatus, Hapalosiphon 

 inundatum, Phormidium 

 Iridis, Navicula 

 irregulare, Staurastrum 

 irrigua, Oscillatoria . . . 

 isthmium, Cosmarium 

 isthmochondrum, Cosmariur 

 Itzigsohnii, Qidogonium 

 janthina, Amphithrix 

 Jenneri, Arthrospira 



Closterium ... 



• Euastrum . . . 



juncidum, Closterium 



Jurgensii, Melosira ... 



Spirogyra... 



/.age 

 II I 



page 



keratophytum, Batrachospermum 12 



