W. WEST AND G. S. WEST: ALGA-FEORA OF YORKSfllRE. 225 



ampla, Glreocystis ... 

 ampullaceiim, Euastium 

 Anabtena, tjenus 

 anceps, Cosmarium ... 



Dialoma 



■ Stauroneis ... 



angli'ca, Navicula 

 anguina, Oscillatoria 

 angulatum, Cosmarium 

 angulosum, Cosmarium 



Pediastrum 



angulosus, Pleurococcus 

 angusta. IVIougeotia ... 



Surirella 



angustata, Navicula... 



Nitzschia... 



angustatum, Closterium 



— ^ — Cosmarium 



Gomphonema 



angustum, Closterium 

 anisochondrum, Cosmarium 

 anomalum, Zygnema 

 ansatum, Euastrum ... 

 antennatus, .Scenedesmus 

 antiacerosum, Closterium 

 antilaria, Oscillatoria 

 antilopieum, Xanthidium 

 Aphanizomenon, Genus 

 Aphanocapsa, Genus 

 Aphanochxte, Genus 

 Aphanothece, Genus 

 apiculata, Cymatopleura 



Micrasterias 



Nitzschia... 



Surirella ... 



apiculatum, Staurastrum 

 Apiocystis, Genus ... 

 aponina, Gomphosphteria 

 appendiculata, Navicula 

 aptogonum, Desmidium 

 aquaticum, Zygnema 

 arbuscula, Ophiocytium 

 Arachne, Staurastrum 

 Archerii, Cosmarium 

 arcticum, Staurastrum 

 arcuatum, Closterium 

 Arcus, Ceiatoneis 



Eunotia 



arenaria, Glceocapsa 



Melosira ... 



arenulata, Melosira ... 

 Argus, Epithemia ... 

 aristiferum, Staurastrum 

 armatum, Xanthidium 

 armigerum, Staurastrum 

 Arnellii, Staurastruni 



