PLATE LXXV. 



FIGS. PAGE 



1-3. Cosmarium turgidum Breb. 1, x 400 (after 



Ralfs) ; 2, x 416 (after Delponte) ; 3, x 400 115 

 4. C. turgidum var. subrotnndatum West. x 400 116 

 5. C. subtiirgidum (Turn.) Schmidle. x 500 



(after Turner) . . . .116 



6-8. C. Corribense W. & Gr. S. West, x 520 . 120 



9. C. Corribense forma. x 520. This form was 

 obtained from pools on Mit chain. Common,, 

 Surrey. It is proportionately narrower than 

 the type. 

 10. C. moniliforme (Turp.) Ralfs forma elongata 



W. & Gr. S. West, x 400 23 



