LAMELLIBBANCHS. 127 



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Edmondia subtruncata MEEK. 



Edmondia subtruncata Meek, 1872: U. S. Geol. Sur. Nebraska, p. 215, 

 pl.ii, tig. 7. 



Closely approaching E. aspinw aliens* 8 , but more subquad- 

 rate in outline, and with the umbonal region more inflated. 



Horizon and localities. Upper Carboniferous, Upper 

 Coal Measures : Kansas City. 



Edmondia glabra MEEK. 



Edmondia glabra Meek, 1872: U. 8. Geol. Sur. Nebraska, p. 214, pi. x, 

 figs. 7a-b. 



Quite small, with large beaks medially located. 

 Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Allorisma hannibalensis SHUMARD. 



Allorisma Aanm6a/ewsisShumard,1855 : Geol. Sur. Missouri, Ann. Rep., 

 p. 206, pi. C, fig. 19. 



Closely resembling A. subcuneata, but very much smaller, 

 and with prominent, concentric carinse at broad intervals. 



Horizon and localities. Lower Carboniferous, Louisiana 

 ( Lithographic ) limestone : Hannibal. 



Allorisma marionensis WHITE. 



Allorisma marionensis White, 1876 : Proe. Acad. Nat. Sci. , Phila. , p. 31. 

 Allorisma marionensis White, 1883: U. S. Geol. Sur. Territories, 12th 

 Ann. Rep., p. 167, pi. xli, figs. 3a-b.. 



A miniature of A. subcuneata. 



Horizon and localities Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



Allorisma antiqua SWALLOW. 



Allorisma antiqua Swallow. 1863: Trans. St. Louis Acad. Sci., rol. II, 

 p. 95. 



A small form with prominent concentric wrinkles. 

 Horizon and localities. Lower Carboniferous, Keokuk 

 limestone : Ste. Genevieve. 



