Explicatio figurarum. 



{a ~ celliila a fronte visa, h = semicellula a vertice visa, 

 c = semicellula a latere visa.) 



Fig. 1. Duo individua, quorum altera semicellula characteres 



Mlcrasteriae pinnatifidae, altera ili. i/ic/sae praebet. "^J". 



» 2. Eiiastrum ahoense n. sp. ^|". 



» 3. Eu. juHfjue n. sp. '^-J-^. 



» 4. Staurastrum tristichiim n. sp. 5o.o^ 



» 5. St. denticulatiim (Naeg.) Archer. (?) ^p. 



» 6. Xantkidium superhum n. sp. *|*^. 



» 7. Cosmarium nitiduliim DeNot.(?) *;o. 



» 8. C. hexacjonum n. sp. •*|^". 



» 9. C impressuhim n. sp. ^J**. 



» 10. C ellipsokleum n. sp. ^p. 



» 11. (7. subpalangula n. sp. '^J"* 



» 12. Closterium (jracile Breb. ■*J°. 



» 13, Peniiim adelochondrum n. sp. '*Jo. 



