VERTEBRATES. 231 



Harpacodus occidentalis ST. JOHN & WORTHBN. 



Harpacodus occidentalis St. John & Worthen, 1875 : Geol. Sur. Illinois, vol. 

 VI, p. 355, pi. xA., figs. 2a-d. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



Chomatodus parallelus ST. JOHN & WORT HEN. 



Chomatodus parallels St. John & Worthen. 1875: Geol. Sur. Illinois, vol. 

 VI, p. 359, pi. xA, figs. 3a-c. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone : Boonville ( Cooper county ). 



Chomatodus incrassatus ST. JOHN & WORTHKN. 



Chomatodus incrassatus St. John & Worthen, 1875: Geol. Sur. Illinois, 

 vol. VI, p. 359, pi. x, figs. 18a-c. 



Horizon and localities Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



Lisgodus curtus ST. JOHN & WORTHEN. 



Lisgodus curtus St. John & Worthen , 1875 : Geol. Sur. Illinois, vol. VI, 

 p. 364, pi. xA, fig. 20a. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone: Boonville. 



Lisgodus selluliformis ST. JOHN & WORTHEN. 



Lisgodus selluliformis St. John & Worthen, 1875 : Geol. Sur. Illinois, vol. 

 VI, p. 366, pi xA., figs. 6a-d. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



Tanaodus praenuntius ST. JOHN & WORTHEN. 



Tanaodus prtenuntius St. John & Worthen, 1875: Geol. Sur. Illinois, vol. 

 VI, p. 371, pi. xi, figs. 6a-d. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone : Saint Louts. 



Tanaodus sculptus ST. JOHN & WORTHEN. 

 Tanaodus sculptus St. John & Worthen, 1875: Geol. Sur. Illinois, vol. VI, 



p. 373, pi. xi, figs. 20a-c. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



