11. Meridioiica« : Frustula cuneata, nodulis in quovis latere nullis.
13. Tabellarieac i Frustula septis internis, fronte linearla, medio
et utroque polo noduloso-inflata, latere rectangulo-tabellata.
1.3. Biildiilphieae : Frustula cellulosa, compressa vel subteretiusoula,
angulis prooessibus instructa, valvae oingulo connatae.
14. Actinisceae; Frustula spinis radiantibus instructa.
Conspectus §^enerum.
Fam. I. Melosireae.
A. Individua solitaria.
1. Cyclotella;
(opcrculata) *).
I a) Frustulum a fronte visum orbicu-
I lare, in ambitu punctatum,
b) a latere eylindraceum, x) oommis-
sura vel annulus interstitialis.
2. Stepliaiiodisciis :
(aegyptiacus).
a) Frustulum a fronte ;
b) a latere denticulorum
corona marginali.
3. Pyxidiciüa :
(major).
Frustulum bivalve, valvae (a, a) elate con-
‘*^vexae, regulariter noduloso-punctatae,
linea transv. ( x ) oommissuram indioat.
*) Nomina in parenthesi adjecta species figniflcant.
