- 917 — 
Conspectus generum 
Auliscus (Elir.) Ratlr. — Valvae circulares, subcirculares ellipticae 
ve, raro obtuse angulares, saepius striis pruinosis donata ; pro- 
cessus 2 raro 1 vel 3-4, mastoidei et elevati vel mammillati, 
limbo hyalino plerumque exstrio cincti ; area centralis distincta 
vel inconspicua. 
Pseudoauliscus Leud. Fort. — Valvae circulares, subcirculares el- 
lipticaeve, saepius areolatae ; processus 2-9, plerumque limbo 
hyalino striato cincti ; area centralis absens vel minuta. 
Monopsis Grove et Sturt. — Valvae circulares, processus singulus 
mastoideus excentricus ; area centralis nulla. 
Ratlrayella De-Toni (Debya Rattr. nec Pantocs.). — Valvae cir- 
culares, radiato-punctatae vel subreliculatae ; processus 3-15. 
Eupodiscus (Ehr.) Rattr. — Valvae circulares, areolatae v. granu- 
latae; processus 1-4- plerumque minuti; area centralis absens. 
Roperia Grun. — Valvae circulares vel subcirculares, areolis he- 
xagoniis ornatae, area singula hyalina parva, circularis, prope 
marginem praesens. 
Fenestrella Grev. — Valvae circulares, granulis radiantibus medio 
fasciis transversis duabus serierum punctorum parallelarum in 
ocellum explanatum desinentibus interruptis ornatae ; area cen- 
tralis angusta. 
Craspedoporus Grev. — Valvae circularc-;, areolatae, areolis allernis 
ad marginem incrassatis processu (ocello vel pseudoporo) in- 
structis; processus 5-11. 
Isodiscus Rattr. — Valvae circulares, areolatae ; area centralis ampia, 
rotundata, subinde absens; processus inaequimagni, 2-3 majores 
aliis 3-8 minoribus interpositis. 
Aulacodisciis Ehr. — Valvae circulares, ocellis, tuberculis, ap- 
pendicibus plerumque magnis per costas vel sulculos conjunftis 
ornatae. 
Actinodiscus Grev. — Valvae circulares, dense granulatae, nucleo 
centrali radiisque numerosis late linearibus e centro usque ad 
marginem excurrentibus donatae (A gen. Craspedoporo Grev. 
imprimis ocellorum absentia differì). 
Cestodiscus Grev. — Valvae circulares ovataeve, granulatae, radia- 
tae, tuberculis marginalibus parvis (A Rattray 1890 Coscinodi- 
SCO adscriptum). 
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