W. WEST AND G. S. WEST: AL(3A-FL0RA Of VORKSHIbE. it^ 



Faiuly COSCINODISCIDEM. 

 Ge.nus COSCINODISCUS Ehrenb., 1838. 



1 04 1. Coscinodiscus lacustris Grun. 



[Syn. Cydotella punctata W. Sm.]. 

 S.E. — Market Weighton Canal, near the River Foulney, 

 attached to Myriophyllum and Potamogeton (G. Norman ; 

 Grunow). 



1042. Coscinodiscus radiatus Ehrenb. 



S.E. — Market Weighton Canal ; Reservoir Waterworks, Hull 

 (G. Norman). Usually marine. 



