124 LAMBLLIBBANCHS. 



Schizodus? curtus MEEK & WORTHEN. 

 Schizodus rossicus Swallow, 1858: Trans. St. Louis Acad. Sci., vol. I, p. 



193 . ( Not S. rossicus de Verneuil . ) 

 Schizodus curtus Meek & Worthen, 1865 : Trans. Chicago Acad. Sci , vol. 



I, P, 18. 

 Schizodus rossicus Geinitz, 1866: Carb. und Dyas in Nebraska, p. 18, tab. 



i, fig. 28. ( Not S. rossicus de Verneuil.) 

 Schizodus curtus Meek, 1872: U. S. Geol. Sur. Nebraska, p. 208, pi. x, 



figs. 13a-e. 



A small suborbicular form, with nearly smooth surface. 

 Horizon and localities. Upper Carboniferous, Upper 

 Coal Measures : Kansas City. 



Chonocardium sp. ? 



A small form of this genus has been found in the " white 

 chert" layers near the base of the Burlington limestone, at 

 Louisiana. The specimens are not now accessible. 



Conocardium parrishi WORTHEN. 



Plate xlvi, figs. 6a-b. 



Conoacrdium parrishi Worthen, 1890: Geol. Sur. Illinois, vol. VIII, p. 112, 

 pi. xx, fig. 7. 



Shell trigonal, cardinal line straight; umbonal ridge slop- 

 ing forward. Surface costate. 



Horizon and localities Upper Carboniferous, Upper Coal 

 Measures: Kansas City. 



Clinopistha radiata (HALL). 



PI ate xlvi, figs, lla-b. 



Edmondia radiata Hall, 1858 : Geology Iowa, vol. I, p. 716, pi. xxix, fig. 3. 

 Clinopistha radiata Meek & Worthen, 1870: Proc. Acad. Nat. Sci., Phila., 



p. 44. 

 Clinopistha radiata var . Icvvis Meek & Worthen, 1873: Geol. Sur. Illinois, 



vol. V, p. 384. pi. xxvii, fig. 7. 

 Clinopistha radiata White, 1884: Geol. Sur. Indiana, Rep. 1883, p. 147, pi. 



xxxi, figs. 6-7. 



Clinopistha radiata Keyes, 1888 : Proc. Acad. Nat. Sci , Phila , p. 233. 

 Clinopistha radiata Keyes, 1891: Johns Hopkins Univ. Circulars, vol. VI, 



p. 29. 



Shell subovate in outline, moderately convex ; beaks blunt; 

 cardinal margin straight, slightly curved downward posteriorly. 

 Surface glabrate, often with obscure radiating lines. 



Horizon and localities. Upper Carboniferous, Lower 

 Coal Measures : Clinton ( Henry county ). 



