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b regulariter striatae binis vel compluribus sulcis notatae 
Ardissonia De Not. 
c tenuissimae, apicibus inflatae, medio ventricosae, punctis irregu- 
lariter dispositis conspersae Toxarium Bail. 
C - Valvae lunatae marginibus integris Ceratoneis (Ehr.) Grun. 
Rhaphoneideae . 
A - Valvae apicibus symmetricis 
a elongatae, apicibus inflatis sine pseudoraphe evidenti 
Clavicula Pant. 
b frustula singula e latere quadrangula vel linearia; valvae pseu- 
doraphen plus minusve latam ostendentes Raphoneis Ehr. 
c frustula geminata inter apices et mediam partem constricta; val- 
vae grosse punctatae sine pseudoraphe evidenti 
Ter e br aria Crev. 
B - Valvae apicibus dissymmetricis, interne cuneatae 
a frustula e latere rectangularia Trachysphaenia P. Pet. 
b frustula e latere cuneiformia 
a valvae pseudonodulis parvulis apice instructae nullaque pseu- 
doraphe Peronìa Breb. et Arn. 
(3 valvae gomphonemoideae pseudoraphe notatae et secus strias 
transverse dispositas punctulatae Sceptroneis Ehr. 
7 valvae pseudoraphen ostendenten margine granulis rotundis 
grossis notatae Grunowiella V. H. 
5 valvae pseudoraphen ostendentes margine granulis transverse 
elongatis, magnis notatae Opephora P. Pet. 
Plagiogrammeae . 
A - Valvae intervallo hyalino centrali transverso ornatae pseudoraphe 
inconspicua Plagìogratnma Grev. 
B - valvae bacillares dissimiles, superior raphe lineari, subtili, binis 
nodulis apices versus exeunti et cupula centrali perforata, loco 
pseudonoduli praedita; inferior pseudoraphe tenui tantum no- 
tata Cyclophora Castrac. 
