Stodder.] 208 [December 8, 



Miocene Richmond Infusorial Deposit. 



DIATOMACE^. 



Actinoptychus senarius 



" biternarius 



Ornpbalopelta punctatus 



" versicolor 



Actinocyclus Ehrenbergii 



Coscinodiscus radiolatus 



" punctatus, oval and spherical varieties. 



" lineatus 



'* velatus 



« marginatus 



" radiatus 



" gigas 



" oculis-iridis 



" perforatus 



" centralis 



" subtilis 



Systephania corona 



Aulacodiscus crux 



Craspedodiscus coscinodiscus 



Asterolampra Brebissonii Greg 



Eupodiscus Rogersii 



Endictya oceanica 



Pyxidicula aculeata 



Stephanopyxifl diadema 



« apendiculata 



Xanthiopyxis globosa 



" hirsuta 



" oblonga 



Rizosolenia americana 



Goniothecuin odontidium 



" Rogersii 



Dicladia capreolus 



Chaetoceros Bp 



BiddulpWa Toumeyii 



Triceratium reticulum 



« undulatum 



" condeconum 



" obtusum 



" marylandicum 



Mastogonia actinoptychus 



Rhaphoneis amphicerus 



Grammatophora marina 



" africana 



Navicula (Pinnularia) perigrina 



" viridis 



" viridula 



Pleurosigma = Nav. signia Eh.— very like P. angulatum. 



Stephanogonia polygonia 



Orthosira marina AV. S. = Galionella sulcata Eh. 

 Fragilaria pinnata 



RHIZOPODS. 



Actinisceae — Actiniscus pentasterias 

 Dictyocha crux .... 

 « fibula .... 

 Mesocenia diodon .... 

 Polycistinae, various .... 

 Phytolitharia Eh— Spongolithis accicularis, S. caputser- 

 pentis; spines of Polycistinae, Acanthometra and 

 others 



5 ft. 



lift. 



14 ft, 



40 ft. 



