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b Diaphragmata complura, semper plus quam bina 
1 - Genera aquae dulcis 
a valvae orbiculares costatae Stylobiblium Ehr. 
P valvae ellipticae, lineares, cruciformi - inflatae, costatae 
Tetracyclus Ralfs 
7 valvae costis destitutae, apicibus et centro inflatae 
Tabellaria Ehr. 
2 - Genera marina 
a valvae validae costis et granulis evidentibus ornatae; diaplira- 
gmata i-3 foraminibus rotundis pervia Rhabdonema Kuetz. 
P valvae validae costis et granulis ornatae, diaphragmata pluri- 
mis foraminibus notata trabeculis transversis scalariformibus 
limitata Climacosira Grun. 
7 valvae fragiles, subtiliter, aegre conspectu granulatae; diaphra- 
gmata absoluta vel apicem versus tantum interrupta 
Striatella A g. 
8 valvae fragiles, subtiliter, aegre conspectu granulatae ; diaphra- 
gmata media regione interrupta Tessella Ehr. 
B - Diaphragmata imperfecta facie nodulorum reducta Lamella Brun 
Licmophoreae. 
A - Frustula cuneata valvis claviformibus pseudoraphe ornatis 
a apices valvarum rotundati, plus minusve lati et inter se differen- 
tes, diaphragmata rotundata ab apice crassiori plus minusve 
recedentia Licmophora Ag. 
b valvae cuneatae, apice crassiori plus minusve longe capitulatae; 
diaphragmata binis foraminibus pervia, alterum ovale, capitulo 
respondens, alterum cuneatum faciem reliquam frustuli imitans 
Licmosphaenia Meresck. 
B - Frustula cuneata valvis clavatis pseudoraphe carentibus diaphra- 
gmatibus scalariformibus praedita Clìmacosphaenia Ehr. 
Entopyleae. 
A - Frustula diaphragmatibus imperfectis ornata Entopyla Ehr. 
B - Frustula diaphragmatibus carentia Gephyria Arn, 
