STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 87 



Derby a crassa (Meek and Hayden) 



Derbya robusta (Hall) 



Chonetes choteauensis Mather 



Chonetes mesolobus Norwood and Pratten 



Aulacorhynchus millepunctatus (Meek and Worthen) 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Productus semireticulatus (Martin) var. 



Pustula nebraskensis (Owen) 



Pustula pertenuis (Meek) 



Pustula punctatus (Martin) 



Pustula symmetricus (McChesney) 



Marginifera muricata var. missouriensis Girty 



Marginifera wabashensis (Norwood and Pratten) 



Dielasma bovidens Morton ? 



Spiriferina kentuckyensis (Shumard) 



Spirifer cameratus Morton 



Spirifer opimus Hall 



Spirifer boonensis Swallow ? 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



Solenomya radiata Meek and Worthen 



Prothyris elegans Meek 



Edmondia anodontoides (Meek) ? 



Edmondia aspinwalleusis Meek 



Edmondia meekiana (Herrick) 



Edmondia gibbosa ( McCoy) 



Edmondia ovata Meek and Worthen 



Edmondia reflexa Meek 



Nucula beyrichi von Schauroth 



Nucula elongata n. sp. ? 



Nucula parva McChesney 



Nuculopsis ventricosa (Hall) 



Leda bellistriata Stevens 



Leda meekana Mark 



Leda prolongata n. sp. 



Yoldia stevensoni Meek 



Parallelodon carbonarius (Cox) 



Parallelodon obsoletus (Meek) 



Parallelodon sangamonensis (Worthen) 



Parallelodon tenuistriatus (Meek and Worthen) 



Aviculopinna americana Meek 



Pteria ohioense (Herrick) 



Pseudomonotis sp. 



Posidonia ? acosta (Cox) ? 



Posidonia girtyi n. sp. 



Posidonia vintonensis n. sp. 



Posidonia sp. 



Myalina pernaformis Cox 



Myalina recurvirostris var. sinuosa n. var. 



Myalina swallovi McChesney 



Schizodus affinis Herrick 



Schizodus cuneatus Meek 



Schizodus curtus Meek and Worthen 



