PLATE LXX. 



FIGS. PAGE 



1-2. Gosmarium rectangulare Grim. 1, x 400 (after 



Wittrock) ; 2, x 500 . . .54 



3. C. n'ctangulare var. Cambrense (Turn.) West & 



G. S. West. x 500 (after Turner) 

 4. C. rectangulare var. Jiexagonum (Elfv.) West & 



G. S. West, x 400 (after Elfving) 

 5. C. sub quadrat urn Nordst. x 400 (after Norcl- 

 stedt) .... 



6-8. G. quadratum Ralfs. 6, x 400 (after Ralfs) ; 

 7, x 500; 8, x 520. Kalis' figure of 

 which we give a copy (fig. 6) is not a good 

 one ; the constriction is too deep. Figs. 7 

 and 8 are much more representative. [Com- 

 pare PL LXXXVII, fig. 19.] . 57 

 9-10. C. plicatum Reinsch. x about 640 (after 



Reinsch) . . . .60 



11. C. plicatum forma major Reinsch. x 400 (after 



Roy & Bissett) . . . .60 



12-13. C. plicatum var. Hibernicnm West. 12, x 520; 



13, x 400 . . .61 



14 16. C. Debaryi Arch. 14, x 400 (after Klebs) ; 



15 and 16, x 400. [Consult PL XCIII,fig. 2.] 61 

 17-19. C. exigimm Arch. 17 and 19, x 520; 18, 



x 400 . . . . 63 



20-22. C. exiguum var. subrectangulum West & Gr. S. 



West, x 520. . . 64 



23-24. C. exiguum var. pressum West & G. 8. West. 



x 520 . . .64 



25-26. C. pseudoexiguum Racib. x 520 . . 65 



27. C. pseudoexiguum var. angustatumWest & G. S. 



West, x 520 . 65 



