BEBDB : FAUNAL STUDIES, II. 171 



Product ns pertenuis Meek. 



Productus semireticulatus | Martin) d'Orbigny. 



Productus symmetricus McChesney. 



Pugnax utah ( Marcou) Hall and Clarke. 



Rcti cnlaria perplexa (McChesney) Schuchert. 



■Semifluid argentia (Shepard) Hall and Clarke. 



Spirifer cameratus Morton. 



Spiriferina cristata (Schlotheim) Dawson. 



Astartclla vera Hall. 



Aviculopecten occidentalis (Shumard) Meek and Hayden. 



f Aviculopecten whitei Meek? 



•Cardiomorplia missouriensis Shumard? 



Edmondia sp. 



f Myalina exasperata Beede. 



Myalina per attenuata Meek and Hayden. 



Myalina swallowi McChesney. 



Xucula veutricosa Hall. 



Pleurophorus tropidopherus Meek. 



Schizodus curtus Meek and Worthen. 



Schizodus sp. 



Solenomya radiata Meek and Worthen. 



■Scdgivickia topekensis (Shumard) Meek and Hayden. 



Bellerophon Cf. bellus Keyes. 



Euomphalus subrugosus ( Meek and Worthen) Meek. 



Pleurotomaria perhumerosa Meek. 



Pleurotomaria sphserulata Conrad. 



Pleurotomaria subdecussata Geinitz. 



Orthoceras cribosum Geinitz. 



Griffithides scitula (Meek and Worthen) Vogdes. 



27. Howard Limestone. This consists of two thin layers 

 of limestone separated by two to ten feet of shales. The lower 

 of these is a hard, blue limestone from twenty inches to two 

 feet in thickness, quite fossiliferous in places, and sometimes 

 quite full of crinoid stems and of fish teeth. The upper layer 

 is usually coarser and more shaly. The clay between them is 

 often very fossiliferous. 



From Doctor Adams's notes, published by Professor Haworth, 8 

 it will be seen that the Howard limestone is the same as the 



8. Ibid., pp. 66, 67. 



