YORKSHIRE NATURALISTS UNION. 



mamillosum, .Stigonema 

 margaritaceum, Penium 



Staurastrum 



margaritiferum, Cosmarium 

 marginata, Polycyslis 

 marina, Synedra 

 Martensiana, l^yngbya 

 Mastogloia, Genus ... 

 maximum, Staurastrum 

 media, Nitzschia 

 mediciana, Leptosira 

 mediolteve, Cosmarium 

 megacanthum, Staurastrum 

 Melosira, Genus 

 Melosireee, Family ... 

 Meneghiniana, Cyclotella 

 -Meneghinii, Cosmarium Si 

 menisculus, Navicula 

 Meriani, Staurastrum 

 Meridion, Genus 

 Meridionidie, Family 

 Merismopedia, Genus 

 Mesocarpeps, Sub-Family 

 mesodon, Diatoma ... 

 mesolepta, Fragilaria 



Na,vicula 



MesotiVnium, (jenus 

 Micrasterias, Genus... 

 microcephala, Achnanthes 

 MicrochiBte, Genus... 

 micrococcum, Mesotivnium 

 micro porum, Crelastrum 

 microscopica, Aphanothece 

 microscopicum, Nostoc 

 microsphinctum, Cosmarium 

 Microspora, Genus ... 

 Microthamnion, Genus 

 minimum, Cosmarium 



Tetraedron 



minor, Aphanoch<T?te 



Chroococcus 



Conferva 



Cosmarium 69 81 



Cylindrocapsa 



I'Aiastrum ... 



Eunotia 



Nitzschia 



Tetmemorus 



minus, Chfetospheridium 



MesotcT?nium... 



minuta, Spirotrenia ... 



Surirella 



minutissima. Amphora 



Nitzschia 



— ■ — Synedra 



minutissimum, Cosmarium 



92 



88 



73 



Trans. Y.N.U., luoi (pub. July i,iir). Dot. Series, \'ol, 



