PLATE LXXVI. 



FIGS. PAGE 



1. Cosmarium Corriense Bissett. x 400 (after 



Roy & Bissett) . . . 133 



2. C. Simii Roy & Biss. x 400 (after Roy & 



Bissett) , . . .134 



3-4. C. radiosum Wolle. 3, x 500 (after Wolle) ; 



4, x 400 . . . 137 



5-7. C. cselatum Ralfs. 5, x 400 (after Kali's) ; 

 6 and 7, x 500. In fig. 5d (after Ralfs) the 

 isthmus was incorrectly portrayed by the 

 author . . . .134 



8. C. cselatum var. spectabile (De Not.) Nordst. 



x 500 . . . . 136 



9.- C. cselatum var. hexagonum West, x 400 . 137 

 10.- C. intermedium Delp. x 416 (after Delponte). 

 We think Delponte's figure of the side view 

 (fig. lOc) is too deeply constricted . . 138 



11. C.cristatum Ralfs. x 400 (after RH If s) . 139 



12. C. monomazum Lund. x 400 (after Luiidell). 

 In fig. 12a the minute basal teeth have been 

 omitted by the lithographer, and the basal 

 part of the semicells is not sufficiently 

 angular . . . .140 



1314. - C. monomazum var. polymazum Nordst. 13, 



x 500 ; 14, x 520 . . . 140 



15-17. C. qiiadrifariiim Lund. 15, x 500; 16, x 400 



(after Lundell) ; 17, x 400 . 141 



