W. WEST AND C. S. WEST: A[,GA-FLORA OF YORKSHIRE. 237 



Sigmoidea, Nitzschia 

 sigmoideum, Closterium 



Rhaphidiura 



silesiaca, Navicula ... 

 simplex, Cosmarium 



Palmodactylon 



simplicissima, O.scillatoria 

 sinuata, Niuschia ... 

 .simiasum, Cosmaiiiim , 



Euastnim . . . 



.Siplioneje, Order 

 Sirosi]ihoniaceEe, P'amily 

 Sniitliii, Eunotia 



Mastogloia 



Navicula... 



Nitzschia .. 



Stauroneis 



Synedra ... 



Xanthidium 



.Solea, Cymatopleura 

 Soleirolei, Himantidiiim 

 solidum, Cosmarium 

 solitaria, Oocystis ... 

 soluta, Coleochjete ... 

 Sorastrum, Genus ... 

 Sorex, Epithemia ... 

 speciosa, Hormiscia... 

 speciosissimum, Cosmarium 

 .speciosimi, Cosmarium 

 spectabilis, Nitzschia 

 Spencerii, Pleurosigma 

 spetsbergensis, Cosmarium 

 sphserica, Aphanothece 

 sphsericum, Ccelastrum 



Nostoc ... 



Sphterogonium, Genus 

 sphteroideum, Cosmarium 

 sphferophora. Navicula 

 SphfBrozosma, Genus 

 Sphagniculum, Cosmarium 

 sphalerostichuni, Cosmarium 

 spicatus, .Scenedesmus 

 spinosa, Orthosira 

 spinospermum, Penium 

 spinosum, Staurastruni 

 spinulosum, Sorastnuii 

 .spirale, Rhaphidium 

 spiralis. Surirella 

 Spirogyra, Genus ... 

 spirostriolatum, Penium 

 ■Spirotsenia, Genus ... 

 Spirulina, Genus 

 Spirulinoidea!, Sub-Family 

 splendens, Synedra... 

 splendida, Oscillatoria 



-n^- Surirella... 



84 



iage 



213 



53 

 122 



171 



85 

 128 



ISO 

 212 

 90 

 61 

 112 

 138 

 195 

 163 

 174 

 216 



165 

 196 



68 

 206 

 194 



72 

 131 



14 

 116. 

 190 



21 



85 



85 

 216 

 182 



74 

 152 

 "5 

 142 



151 



73 



.76 



no 



91 



72 



120 



217 



45 



98 



116 



122 



200 



35 

 46 



39 

 151 

 ■51 

 197 



'5° 



207 



Bot. 5— P 



