PLATE CXXX. 



FIGS. PAGE 



1-2. Staurastrum dejectum var. patens Nordst. 1, X 570 



(after Nordstedt) ; 2, X ? (after Borge) . 9 



3-5. St. dejectum var. inflatum West. X 520 . 10 



6-8. St. connatum (Lund.) Roy & Biss. 6, X 400 



(after Lundell) ; 7, X 400; 8*, X 510 . 15 



9. St. connatum var. Spencerianum Nordst. Zygo- 



spore, X 400 (after Nordstedt) . . 16 



10-12. St. mucronatum Ralfs. 10, zygospore, X 400 



(after Ralfs) ; 11 and 12, x 520 . .11 



13-14. St. mucronatum var. subtriangulare W. & G. S. W. 



X 520. . . . .12 



15-16. . curvatum West. 15, X 520 ; 16, X 400 . 19 

 17-18. St. jacidifcrum West. 17, biradiate form, X 520 : 



18, triradiate form, X 520 . .16 



