196 THE AMERICAN MIDLAND NATURALIST 



Floydia concentrica Webster 



Floydia concentrica multisinuata Fenton 



Loxonema hamiltonensis Hall 



Loxonema sps. 



Platydesma sp. 



Paleotrochus sps. 

 Cephalopoda 



Orthoceras terryx Hall 



Orthoceras consortale Hall 



Orthoceras sps. 



Gomphoceras sps. 



Manticoceras pattersoni (Hall) 

 Vertebrata 

 Piscea 



Ptyctodus calceolus M. & W. 



Dinicthys pustulosus Eastman 



Diplodus stria tus Eastman 



Diplodus priscus Eastman 



Apsidicthys sp. 



Fossil Species of the Striatula Zone. 



PLANTAE 



"Fucoids," several species. 

 ANIMALES 

 Molluscoidea 

 Bryozoa 



Lioclema occidens (H. & W.)* 



Undetermined species. 

 Brachiopoda 



Crania famelica H. & W.* 



Leptostrophia canace (H. & W.)* 



Douvillina arcuata (Hall)* 



Gypidula cf. comis (owen) n. s.* 



Centronella navicella (Hall)* 



Centronella sp. 



Cranaena calvini (H. & W.)?* 



Schizophoria striatula (Schloth.) 



Atrypa reticularis (Linn.) 



Atrypa reticularis alta Fenton?* 



* Found in the Gypidula faunule, at Rockford. 



