Grammatophora serpentina Eh. 

 Hyalodiscus subtilis Bail. 

 Melosira sol Eh. 



— sulcata. Eh. 

 Navicula aspera Eh. 



— didyma Kta. 

 , — directa Greg. 



— Hennedyi W. Sm. 



— — var. subrostrata Me- 



resk. 



— liber W. Sm. 



— lyra Eh. 



— Smithii Bréb. 

 Plearosigma balticum W. Sm. 



— formosum W. Sm. 



— nicobaricum Grun. 

 PaeudAuliHcuH pieruvianus Ratt. 



— radiatus Eatt. 



è38 — 



Raphoneis lumen J. Br, 



— superbaJan. 

 Rhabdonema adriaticum Eh. 

 Rhizosolenia styliformis Bright. 

 Septroneis caduceui Eh. 



— maririum Grun. 

 Skeletonema costatum. Grev. 



— — var. spiralis Me- 

 resk. 



Sperinatogonia antiqua Leud. Fort. 

 Stepbanopyxis turris Grev. 

 Synedra afflnis Ktz. 

 Triceratium alternans Eh. 



— — var . variabilis 

 Bright. 



— favus Eh. 



— pentacrinus Wall. 



N" 457 et 458 CHERRYFIELD — MAINE (États-Unis) 

 Dépôt fossile d'eau douce 



Cymbella Ehrenbergii Ktz. 

 Eunotia bactriana Eh. 



— camelus Eh. 



— heraicyclus Eh 



— diadema Eh. 



— incisa Greg. 



— triodon Eh. 



— telraodon Eh. 



— robusta Ralfs. 

 Gomphonema acuminatum Ktz. 



IVavieula acrospliseria W. Sm. 



— amphigomphus Eh. 



— bacillaris Greg. 



— bacillum Eh. 



— dilatata Eh. 



— dactylusEh. 



— divergens W. Sm. 



— elliptica Ktz. 



— firma Ktz. 



— follis Eh. 



IVavicula gigas Eh. 



— iridis Eh. 



— macilenta Eh. 



— nobilis Eh. 



— polyonca Bréb. 



— rhomboides Eh, 



— — var. diaphana Eh. 



— serians. Bréb. 



— stauroneiformis W. Sm. 



— tabellaria Eh. 



— trochus Eh. 



— tumescans Eh. 

 Stauroneis anceps Eh. 



— gracilis Eh. 



— legumen Eh. 



— phœnicenteron Eh. 

 8t<;nopterobia anceps Bréb. 

 Surirella intermedia W. Sm. 



— linearis W. Sm. 

 Tabellaria fenestrata. Ktz. 



