44 BRACHIOPODS. 



Productus ovatus HALL. 



Productus ovatus Hall, 1858: Geology Iowa, vol. I, p. 674, pi. xxiv, 



fig. 1. 



A small oval form, with fine radiating costse. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone : St. Louis. 



Productus tenuicostus HALL. 



Productus tenuicostus Hall, 1858: Geology Iowa, vol. 1, p. 675, pi. xxiv, 

 figs. 2a-d. 



Closely related to and perhaps identical with P. Iceviwstm. 

 Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone : St. Louis. 



Productus cestriensis WORTHBN. 



Productus elegans Norwood & Pratten, 1854: Jour. Acad. Nat. Sci., 



PhiJa. , vol. Ill, p. 13, pi. i, figs. 7a-c ( Not McCoy, 1844. ) 

 Productus cestriensis Worthen, 1860: Trans. St. Louis Acad. Sci., vol. I, 



p. 570. 

 Productus parvus Meek & Worthen, 1860: Proc. Acad. Nat. Sci., Phila., 



p. 450. 

 Productus parvus Meek & Worthen, 1866: Geol. Sur. Illinois, vol. II, p. 



297, pi. xxiii, figs. 4a-e. 



Shell small, arcuate, with hinge-line shorter than greatest 

 width. Eadiating costre coarse. 



Horizon and localities Lower Carboniferous, Kaskaskia 

 limestone : Ste. Mary ( Ste. Genevieve county ). 



Productus americanus SWALLOW. 



Productus americanus Swallow, 1863 : Trans. St. Louis Acad. Sci., vol. 

 II, p. 91. 



According to Meek & Worthen this form is closely related 

 to their P. magnus. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures: Harrison county. 



