238 VERTEBRATES. 



Batacanthus baculiformis ST. JOHN & WORTHEN. 



Batacanthus baculiformis St. John & Worthen, 1875: Geol. Sur. Illinois, 

 vol. VI, p. 469, pi. xxi, figa. 4a-f. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone: LaGrange (Lewis coanty), St. Francis ville (Clark 

 county.) 



Oracanthus vetustus LKIDY. 



Oracanthus vetustus Leidy, 1856: Jour. Acad. Nat. ScL, Phila., (2) r 



vol. Ill, p. 161, pi. 16, figa. 1, 2, 3. 

 Oracanthus consimilis St. John & Worthen, 1875: Geol. Sur. Illinois, vok 



VI, p. 476, pi. xxii, fig. 15a-d. 



Oracanthus vetustus St. John & Worthen, 1883: Geol. Sur. Illinois, vol. 



VII, p. 255, pi. xxix, figs. 2a-d. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 Hmestone : Saint Louis. 



Gampsacanthus latus ST. JOHN & WORTHEN. 



Gampsacanthus ? latus St. John & Worthen, 1875: Geol. Sur. Illinois, Tol. 

 VI, p, 474, pi. xxii, figs. 14a. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone : Boonville ( Cooper county.) 



Gampsacanthus squamosus ST. JOHN & WORTHEN. 



Gampsacanthus sguamosus St. John & Worthen, 1875: Geol. Sur. Illinois, 

 vol. VII, p. 473, pi. xxii, figs. 13a-c. 



Horizon and localities. Lower Carboniferous. Saint Louis- 

 limestone : Saint Louis. 



Gampsacanthus typus ST. JOHN & WORTHEN. 



Gampsacanthus typus St. John & Worthen, 1875: Geol. Sur. Illinois, vol. 

 VI, p^472, pi. xxii, figs. 12a-d. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone: Saint Louis. 



Lecracanthus unguiculus ST. JOHN & WORTHEN. 



Lecracanihus unguiculus St. John & Worthen, 1875 : Geol. Sur. Illinois, 

 vol. VI, p. 476, pi. xxii, figs. lOa-c. 



Horizon and localities- Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



