153 
C - Valvae ocellis singulis vel compluribus, complanatae vel convexae 
aequa manu per totani superficie!!! consculptae, area centrali 
carentes 
a valvae complanatae ocello singulo ornatae laeviter aiveolatae, 
deorsum subtiliter punctulatae Roperia Grun. 
b valvae plerumque convexae ocellis pedicellatis compluribus or- 
natae, arctissime aiveolatae deorsum sed primo obtutu difpcul- 
ter observandum punctulatae Eupodìscus (Ehr.) Rattr. 
c valvae radiatim punctatae, margine grosse tuberculatae 
Perithyra Ehr. 
d valvae dense granulatae corona punctorum hyalinorum ocelloque 
singulo pedicellato margine notatae Micropodiscus Grun. 
D - Valvae apiculis spiniformibus fere inconspicuis peripherice nota- 
tae, radiatim granulatae, marginibus plus minusve ornatis ela- 
tisque 
a ocello singulo facile conspicuo 
a valvae orbiculares Actinocyclus Ehr. 
p valvae semilunares Hemidiscus Wall. 
b ocello nullo 
a valvae orbiculares, rarius ellipticae vel lanceolatae marginibus 
torulosis simplicibus Cestodiscus Grev. 
(3 valvae orbiculares marginibus torulosis lemnisco quodam pecu- 
liari ornatis, subtiliter radiatim punctatae radiisque evidentiori- 
bus geminatis regulariter interpositis radium hyalinum inclu- 
dentibus ansis lemnisci respondentibus ornatae Bruma Temp. 
E - Valvae apiculis spiniformibus, areola hyalina circumfusis notatae 
margine subtiliter et dense granulatae, radiis hyalinis areolis 
marginalibus exeuntibus in sectores divisae centro hyalino sub- 
orbiculari 
a valvae circulares Temperea Forti 
b valvae semilunares Palmeria Grev. 
F - Valvae processibus mammosis non ocellatis parcissime promi- 
nentibus 
a valvae apiculis periphericis plerumque notatae plus minusve 
dense punctulatae, processus arcu punctis crassis altero alterum 
contiguis extructo notati Janischia Grun. 
