1890.] NATURAL SCIENCES OF PHILADELPHIA. 139 



Raphidodiscus Febicjerii, T. Christiau. 

 Rhaphoneis gemmifera, Ehr. 

 Rhaphoneis amphiceros, Ehr. 

 Rhaphoneis Belgica, Grun. 

 Rhaphoneis fluminensis, Grun, 

 Rhaphoneis scalaris, Ehr. 

 Rhizosolenia Americana, Ehr. 

 Rhizosolenia styliformis, Bright. 



SCEPTRONEIS CADUCEUS, Ehr. 



Sceptroneis gemmata, Grun. 



Stephanogonia Actinoptychus, Ehr. 



Stephanogonia polygona, Ehr. 



Stephanopyxis apiculata, Ehr. 



Stephanopyxis ferox, (Grev.) Ralfs. 



Stephanopyxis Corona, (Ehr.) Grun. 



Stephanopyxis Grunowii, Grove & Sturt. 



Stephanopyxis limbata, Ehr. Rare. 



Stephanopyxis Turris, (Grev.) Ralfs. 



Stictodiscus Buryanus, Grev. 



Stictodiscus Kittonianus, Grev. 



SuRiRELLA Fe^igerii, Lewis. 



Tabulina testudo, J. Brun. 



Terpsinoe intermedia, Grun. var. 



Triceratium American um, Ralfs. 



Triceratium condecorum, Bright. 



Triceratium Ehrenbergii, Grun. 



Triceratium Ehrenbergii, (Discoplea undulata, Ehr.) 



Triceratium Fisherii, A. S. 



Triceratium Heilprinianum, n. sp., Kain & Schultze. 



Triceratium Kainii, n. sp., Schultze. 



Triceratium indentatum, n. sp., Kain & Schultze. 



Triceratium Kainii, Schultze, var. constrictum, Kain & 

 Schultze, n. var. 



Triceratium Marylandicum, Bright. 



Triceratium obtusum, Ehr. 



Triceratium robustum, Grev. 



Triceratium semicirculare. Bright. = (Euodia Bright- 

 WELLii, Ralfs.) 



Triceratium spinosum, Bailey. 



Triceratium Solenoceros, Ehr. Rare, 



Triceratium tessellatum, Grev. 



Triceratium undulatum, Ehr. 



