Contributions to Our KtiowJedge of the Freshwater Algae of Africa. 43 
lateralibus minus couvexis. Long., 85-96 /i; iat., 66-72 /z; lat. istlim., 
18-21 ; crass., 41-42 yu. 
Sample 327 (rare). 
This variety is distinguished hy the possession of larger and more 
numerous granules, -by the truncate or even retuse apex, by the flattening of 
the poles in end-view, and the shape of the semicell in side-view. It 
approaches somewhat to var. eniarginatfim, Hansgirg (Prodr. Algenfl 
Fig. 17. — Cosmarium hotrytis, Meneg-li., var. lyegleri, F. E. Fritsch, nov. var. A, 
front-, B, end-, and C, side-views, x 660. 
Boehmen, i, 1888, p. 199, fig. 116), in which, however, the apex is much 
narrower. There is also some resemblance to C. deltoideum, Delp., although 
end- and side-views are markedly different. 
19. Cosmarium gayanum, Do Toni ; W. & G. S. West, loc. cit., p. 7, 
PL cm, figs. 6, 6. 
Var. rot'imdata, F. E. Fritsch, nov. var. (Fig. 18). 
Apicibus semicellularuni in aspectu frontali rotundatis hand truncatis, 
granulis minus regulariter ordinatis, praecipue in media parte semicellularuni. 
