w. West and g. s. west: alga-flora ok Yorkshire. 231 



Hyalotheca, Genus... 

 Hydrodictyon, Genus 

 Hydrogastracea?, Family 

 HydruracePe, Family 

 Hydrurus, Genus ... 

 Hyndmanni, Epitliemia 

 Hyslrix, Scenedesmus 

 impressulum, Cosmarium 

 incavatum, Eviastrum 

 incisa, Eunotia 

 inconspicuum, Cosmarium 



Penium 



incrustans, Sphferogonium 

 incuivum, Closterium 

 Incus, Arthrodesmus 

 Ineffigiata, Genus ... 

 inflata, Denticula 



Navicula 



■ ■ Spirogyi'a 



inflexum, Staurastrum 

 informe, Stigonema . . . 

 infusionum, Dactylococcus 



Glfeocystis 



inornatum, Cosmarium 

 insigne, Euastrum ... 



• Gomphonema 



Zygnema 



insignis, Spirogyra .. 



Urococcus ... 



insulare, Euastrum ... 

 Integra, Navicula 

 integrum, Cosmarium 



Pediastrum 



intermedia, BulbochEete 

 intermedium, Closterium 



Cosmarium 



interrupta, (Jeminella 



Pinnularia 



interruptum, Penium 

 intestinalis, Enteromorpha 

 intricatum, Gomphonema 

 intricatus, Hapalosiphon 

 inundatum, Phormidium 

 Iridis, Navicula 

 irregulare, Staurastrum 

 irrigua, Oscillatoria ... 

 isthniium, Cosmarium 

 isthmochondrum, Cosmarium 

 Itzigsohnii, CEdogoniimi 

 janthina, Amphithrix 

 Jenneri, Arthrospira 



Closterium . . . 



■ Euastrum . . . 



juncidum, Closterium 



Jurgensii, Melosira ... 



Spirogyra... 



III 



115 



"3 

 13 

 13 

 192 

 121 

 92 



65 

 194 



74 

 48 



151 

 50 

 109 

 130 

 204 

 173 

 35 

 loS 

 139 

 118 



133 



89 



62 



186 



35 



36 



134 



65 



175 



80 



117 



15 



55 



85 



21 



167 



45 



17 



I8S 



138 



147 



178 



104 



149 



86 



72 



15 



137 



151 



49 



62 



56 



218 



37 



keratopliytum, Batrachospermum 12 



