BSACHIOPODS. 53 



Chonetes geniculatus WHITE. 



Plate xxxviii, flg. 3. 



Chonetes geniculatm White, 1862 : Proc. Boston Soc. Nat. Hist., vol. IX, 

 p. 29. 



A small form with fine radiating lines. 



Horizon and localities. Lower Carboniferous, Louisiana 

 ( Kinderhook ? ) limestone : Louisiana, Clarksville. 



Chonetes ornata SHUMARD. 

 Plate xxxviii, fig. 2. 



Chonetes ornata Shumard , 1855 : Geol. Sur. Missouri, Ann. Rep., p. 202, 

 pi. C, figs. la-c. 



Eesembling somewhat C. flemingi* but having much 

 coarser radiating costae. 



Horizon and localities. Lower Carboniferous, Kinderkook 

 beds : Hannibal, Louisiana, Vandever Falls ( Cooper county). 



Chonetes logani NORWOOD & PRATTEN. 

 Chonetes logani Norwood & Pratten, 1854 : Jour. Acad. Nat. Sci., Phila. 



A small, semielliptic form with rather coarse, radiating 

 lines. 



Horizon and localities Lower Carboniferous, Burlington 

 limestone : Hannibal, Louisiana. 



Chonetes illinoisensis WORTHEN. 



Chonetes logani Hall, 1858: Geology Iowa, vol. I, p. 598, pi. xii, figs. la-b. 

 Chonetes illinoisensis Worthen, 1860: Trans. St. Louis Acad. Sci., vol. I, 



p. 571. 

 Chonete* illinoisensis Meek & Worthen, 1868: Geol. Sur. Illinois, vol. Ill, 



p. 505, pi. xv, figs. 8a-b. 



Somewhat resembling C. logani, but larger, and with about 

 four times as many radiating lines. 



Horizon and localities. Lower Carboniferous, Lower Bur- 

 lington limestone: Louisiana, Ash Grove (Greene county). 



Chonetes mesoloba NORWOOD & PRATTEN. 

 Chonetes mesoloba Norwood & Pratten, 1854: Jour. Acad. Nat. Sci., Phila., 



(2), vol. Ill, p. 27, pi. ii, figs. 7a-c. 

 Chonetes mesoloba White, 1875: U. S. Geog. Sur. w. 100 merid., vol. IV, 



pt. ii, p. 123, pi. ix, figs. 7a. 

 Chonetes mesoloba Keyes, 1888: Proc. Acad. Nat. Sci., Phila., p. 228. 



