C O N T E iNT T B . 



Introduction. 



1. Caryospluera aequidistans, it. sp. 



'2. Ceiiellipsis hexagonalis, n. sj>. 



3. Priuiuluin calococcus, u. sjk 



4. Cyi'tocalpis crassitestata, tt. sjk 



5. Dictyocephalus microstoma, n. sp. 

 •6. Dictyocephalus macrostoma, n. sp. 

 7. Tlieocampe splujerocephala, ii. sp. 

 (S. Tricolocapsa salva, Hiist. 



9. Tricolocapsa thoracica, a. sjk 



10. Tricolocapsa Dowlingi, n. s/). 



11. Tricolocapsa Selwyni, n. sjk 



12. Dictyomitra Canadensis, n. sp. 



13. Dictyomitra polypora, ZittpJ. 



14. Dictyomitra multicostata, Ziftel. 



15. Stichocapsa Tyi'i-elli, x. sp. 



16. Stichocapsa Dawsoni, n. sp. 

 Explanations of plates XTY-, XV. and XVI. 



