70 



Nomina 

 Generum 



Richmond 

 Virgin iae 



Petersburg 

 Virginiae 



Piscataway 

 Marylandiae 



56 clathrata 



51 Dictyocha * aculeata 



58 *Crujc Crux Crux 



59 Epiodon Epiodon 



60 * Fibula Fibula 



61 * Speculum 



62 Staurodon 



63 * triactis 



64 , . . ubera 



65 Discoplea americana 



66 Eunotia * Diodon 



67 *Monodon? 



68 *gibba? 



69 EüPODISCUS * germanicus germanicus germankus 



70 * Baileyi 



71 * Rogersii 



72 Flustrella concentrica 



73 Fragilaria amphiceros 



74 laeeis 



75 leptoceros 



76 * pinnata 



77 Gallionella * sulcata sulcata sulcata 



78 Gomphonema * clavalum 



79 * minulissimum 



80 Goniothecium didymum 



81 Gastridium 



82 hispidum 



83 monodon monodon 



84 Navicula 



85 obtusum 



86 Odontella Odonlella OdonlcUn 



87 Rogersii 



88 Grammalophora* africana africana? 



89 *angulosa 



90 * oceanica 



