192 THE AMERICAN MIDLAND NATURALIST 



Schizophoria striatula impressa (Hall) 



Leptostrophia canace (H. & W.) 



Leptostrophia perplana nervosa (Hall) 



Stropheodonta n. sp. (cf. calvini Miller) 



Stropheodonta exilis Calvin(?) 



Douvillina, n. sp. 



Douvillina arcuata (Hall) 



Douvillina arcuata maxim'a Fenton , 



Strophonella reversa Hall 



Strophonella reversa gravis Fenton 



Strophonella reversa hybrida (H. & W.) 



Schuchertella prava Hall 



Schuchertella prava Hall 



Schuchertella sp. 



Productella hallana Walcott 



Productella truncata Hall 



Productella speciosa Hall 



Gypidula comis munda (Calvin) 



Gypidula cf. comis Owen 



Rhynchonella subacuminata Webster 



Camarotoechia contracta saxatilis Hall 



Rhipidomella cf. penelope Hall 



Pugnoides altus (Calvin) 



Pugnoides ambiguus (Calvin) 



Liorhynchus iris Hall 



Liorhynchus sp. 



Centronella navicella (Hall) 



Cranaena calvini (H. & W.) 



Atrypa reticularis (Linn.) 



Atrypa reticularis hackberry^nsis (Webster) 



Atrypa reticularis alta Fenton 



Atrypa reticularis (Linn.) n. var. 



Atrypa hyfstrix Hall 



Atrypa cf. spinosa Hall 



Atrypa cf. aspera Hall 



Spirifer whitneyi Hall 



Spirifer whitneyi rockfordensis Fenton 



Spirifer whitneyi gradatus Fenton 



Spirifer whitneyi productus Fenton 



Spirifer — sp. 



