258 E. C. CASE AND W. I. ROBINSON 



Ceratopsis robusta 



Calymene, a new species allied to C. fayettensis and C. mamillatus. 



Conodont 



Lower Richmond. — A bed about ten feet thick occurs at the top 

 of Little Limestone and on the southeastern slope of Big Lime- 

 stone which contains fossils of this age. The matrix is siliceous and 

 the fossils are, as a rule, silicified. 



Streptelasma rusticum{?) 



Halysiies gracilis 



locrinus aff, /. crassus 



Orbiculoidea {?Schizotreta), n. sp. 



Rafinesquina, n. sp. 



Leptaena unicostata, two new varieties 



Plectambonites sp. 



Plectorthis whitfieldi 



Plectorthis kankakensis 



Dalmanella aff. rogata 



Dinorthis subquadrata 



Hebertella, n. sp. aff. H. insculpta, H. fausta 



Platystrophia sp. 



Rhynchotrema capax 



Galena {Stewartville or Upper Galena). — Sixty feet of heavy- 

 bedded, cream-colored dolomite beneath the Lower Richmond on 

 Little Limestone and at the top of Sherman Hill. The fossils occur 

 near the top of the bed. 



Cyrtolites cf, retrorsus 

 Liospira cf. angustata 

 Hormotoma{?) major 

 . Lophospira minnesotensis 

 Maclurea crassa 

 Maclurina manitobensis 

 Maclurina cuneata 

 Trochonema umbilicatum 

 Fusispira subbrevis 

 Spiroceras sp. 

 Salpingostoma cf. expansa Hall and buelli Whitfield 



Decor ah {Upper Blue). — Below the last-described layer there is 

 an old quarry on the eastern face of Little Limestone in a thin- 

 bedded dolomite. The top layers are gray, the lower layers cream- 

 colored with blotches of dark-red iron stain. Identical fossils 



