— 163 - 



Encyonema yentricosum Ktz. 

 Epitbemia gibba Ehr. 



— turgida Ktz. 



— — V. granulata. 

 Fragilaria binodis Ehr. 



— capucina Desm. > 



— virescens Ralfa. 

 Gomphonema Brebissonii Ktz. 



— constrictum Ehr. 



— — V. subcapitata 



Grun. 



— intricatum Ktz. 



— olivaceum Ehr. 



— vibrio Ehr. 

 Magtogloia Smithii Thw. 



Meridion circulare Ag. 

 mavicala ambigua Ehr. 



— elliptica Ktz. 



— major Ktz. 



— patula W. Sm. 



— radiosa Ktz. 



— viridis Ktz. 

 Nitzschia angustata W. Sm. 



— linearis W. Sm. 

 Pleurosigma Spencerii W 

 Synedra capitata Eh. 



— delicatissima W. 



— gracilis Grun. 

 Tabellaria fenestrata Ktz. 



— flocculosa Ktz. 



Sm. 



Sm. 



Nos 297-299 CALVERT COUNTY — MARYLAMD 



(États-Unis) 



Dépôt fossile marin 



Aetinocyclud Ehrenbergii Ralfs. 

 Actinoptychus Heliopelta Eii. 

 Asterolampra Marylandica Eh. 

 Aulacodiscus crua; Eh. 

 Biddalphia Edwardsii Febig. 



— suborbicularis Grun. 

 CosciDodiscus asteromphalus Eh. 



— — car. hybrida 



Grun. 



— apiculatus Eh. 



— biangulatuB A. S. 



— bulliensA. S. 



— centralis Eh. 



— concinnus W. Sm. 



— marginatus Eh. 



— oculus-iridis Eh. 



— obscurusEh. 



— perforatus Eh.. 



— radiolatus Eh. 



— robustus Grev. 



— subtilis Eh. 



— velatus Eh. 



Craspedodiscaselegans Eh. 



— coscinodiscus Eh. 

 Eapodiscus Rogersii Bail. 

 Goniothecium odontella Eh. 

 Mastogonia crux Eh. 

 Melosira sulcata Eh. 



Pleurosigma afûne var. Grun. 



— Marylandica Grun. 



Pyxilta uuiericana Eh. 

 Stepbanogonia actinoptychus Grun. 



8tephanopyxi8 coron a Eh. 



— iimbata Kh. 



— turris Eh. 



Triceratium americanum Ralfs. 



— Ehrenbergii Grun, 



— obtusum Eh, 



— sermicirculare. 



— solenoceros Bright. 



— tessellatum Grev. var. 



— undulatum Eh. 



