PLATE XIX. 



Figures magnified 500 diameter: 



Figs. 1, 2. Cosmarium Eloiseanum, front and end view, . 



."' c>. ( osmahii m ii:ipu< \n \i. fronl lateral ;m<l end views, and 



y.\ 'gospore, . . . . 



7, 8. CoSMARII M "\'\ ' l"~l M, 



Fig. 9. smaller form, . 



Figs. 10, 11. < osmarii M PY( \'" hondrum, front and lateral \ir\\^, 



12, 13. Cosmarium E'extinoides, fronl and side views, . 



14, 15. Cosmarium bpeciosum, small variety, 



16 18. Cosmarium pseudopectinoides ; two in front view, one in side 



P M.r. 



i 



view, . 



Fig. 1 9. ( ' SW LRIUM NASUTUM, 



s7 

 87 

 89 

 38 

 87 



89 



" 20. Cosmarium bubcrenatum, (Compare Plate XVIII, fig. 6, 7, . B4 



FigB. 21 22. COSMARTI M RADIOSUM, ..... 90 



23, 24. < osm \i:h m bireme, in three views, front, side and end, 



25,26. Cosmarii m margaritum, in three views, . . .80 



Fig. 27. zygospore, with the remains of the 



semicells attached, . . . 80 



> 30. Cosmarium tithophorum, from three points of view, . x, 



.",1 :;:;. Cosmarium Blyttii, front, side and end views, . . v 7 



