248 MR. W. p. HIERN ON THE PEOULIARITIES 



Fig. 3. Ccelastrum verrucosumy Eeinscli. Familia sphaerica ex cellulis 16 consti- 



tuta. 



720 



4. Cosmarium Hammeri, Rcinscli, var. Specimen majus, a fronte, X^ 



7*^0 



5. C. abnorme, Nordstedt. Specimen a fronte, x -^ 



720 



6. C. ahiorme, var. trigonuMy x -y-. Aliud specimen, a yertice. 



7. C. jpunctulatum, Brebisson, Specimen a fronte, X ^. 



8. C. pidcherrimum, Nordst. Specimen a fronte, X — . 



9. C. asperulum, Keinsch. Specimen cum cj-tioplasmate, X — . 



10. Comiariiim, spec. nov. Specimen formal rainoris cellula in statu divi- 



sion! s, X -—. 



11. Idem, Specimen formse ma j oris, X ^. 



12. Euastru77i submcisum,'Remsch, Cellula vacua, a fronte, X — • 



1 



13. Staurasirum margaritaceum, Ehrenberg. Specimen, a fronte X — * 



720 



] 4. Aliud specimen, a vertice, X ^. 



15. S,exiguumy Eeinsch. Specimen a fronte, x — . 



16. Aliud specimen, a yertice, X -- 



17. Zygnema tetraspermim, Eeinsch. Fila duo in statu secundo copulatio- 



nis, zygospore modice evolutse ; cum cystiodermate distincto limitato 

 simpliciter striato ; limina cellularum copulatarum cystioplasmate 



perfecte vacua, X —• 



18. Z, Utra^fermum, Ultimus status cellularum fill copulatione lateral! 



zygosporis in lumine processuum copulativorum subevolutis cytioder- 



mate distincto limitatis, X — • 



19. Z. tetraspermim, Fili sterilis pars, X ^^ 



20. Z. tetraspermum, Zygospora evoluta magis aucta, nucleis ehloroptyl- 



laceis sphairicis regulariter positis, X ^ 



21. Lymnodictyon, spec, nov., Eeinsch. Specimen majus ex cellulis cytio- 



plasmate repletisconstitutum, X — . 



On the Peculiarities and Distribution of Eubiace^ in Tropical 



Africa. By W. P. Hierk, M.A., F.L.S., &c, 



[Read June 21, 1877.] 

 (Plates VII. & VIII.) 



Pbeliminaet Eemaeks. 

 The only general account of the Eubiace£e of Tropical Africa that 

 nas hitherto appeared, professing to deal with the general bear- 





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