32 
Transactions of the Royal Society of South Africa. 
of the membrane is also unusual. The median inflation in end-view 
(Fig. 11, B, c) is not as pronounced as is usual in the varieties of this 
species, and in this respect var. africana forms a transition to the type, 
which is altogether without a median inflation. The somewhat variable 
side-view (Fig. 11, B, b, h') is also different. 
It is possible that the f. ac^Ua described by Turner (* K. Sv. Vet.-Akad. 
Hand.,' xxv, 1892, p. 53, Tab. VIII, fig. 15) belongs to this variety, 
A closely allied species appears to be C. aequale, Turner (Joe. cit., p. 64, 
Tab. IX, fig. 31). 
4. Cosmaritvm granatum, Breb. ; W. & Gr. S. West, loc. cit., p. 186, 
PI. LXIII, figs. 1-3. 
Samples 26, 158. 
Previously recorded from Cape Colony (Fritsch) . 
Long, cell., 24-45 /x ; lat. cell., 19-35 /x; lat. isthm., 6-8 /x. 
forma apicibus leviter incrassatis vel etiam retusis. 
Long, cell., 24 [x ; lat. cell., 18 /x ; lat. isthm., 6 /x (Fig. 11, H). 
Sample 327 (rare). 
Some specimens of this form had semicells in which the angles were 
more rounded than in Fig. 11, i?, such individuals grading over into the 
forms of C. laeve, Eabenh., mentioned below. 
Var. africamim, F. E. Fritsch, nov. var. (Fig. 11, C). 
Semicellulis lateribus prope basin divergentibus, lateribus superioribus 
rectis vel levissime concavis, apicibus angustis truncatis, saepe cum membrana 
paullo incrassata ; a latere visis lateribus minus convexis quam in typo, 
apicibus late rotundatis ; a vertice visis ellipticis inflatione mediana distincta. 
Long, cell., 30-38 fx ; lat. cell., 21-24 /x ; lat. apic, 4-5 /x ; lat. isthm., 5-10 /x ; 
crass., 10-15 /x. 
Sample 327 (rather rare). 
This variety (c/. especially fig. 11, C, a") seems to be near var. suh- 
angulare, W. & G-. S. West (" Alg. Madagascar," ' Trans. Linn. Soc.,Bot.,' v, 
1895, p. 54, PI. VIII, fig. 4), but the latter has retuse upper lateral margins, a 
retuse and rather wider apex, and a much narrower isthmus. The end-view 
is also quite different. There is considerable resemblance to C. pseudo- 
granatum, Nordst., forma, G-utwinski (' Rozprawy Akad. Umiej. Wydz. 
Mat.-Przyz. Krakow,' ser. 2, xiii, 1898, p. 44, Tab. VII, fig. 38). 
5. Cosmaritim pseudoniticluhim, Nordst. ; W. & G. S. West, loc. cit., 
p. 195, PI. LXIII, fig. 26. 
Var. validum, W. & G. S. West, loc. cit., p. 196, PI. LXIII, figs. 27-30. 
(Syn. : C. imchydermum, Lund., var. minus, Nordst.) 
Samples 311, 312. 
Long, cell., 70-72 fx; lat. cell., 55-58 /x ; lat. isthm., 18-21 /x. Cell-wall 
thick and densely punctate. 
