Prod. 



766 



Productus 



? H. £). Rogers, Geology of Pennsylvania, 

 ^ 1858, page 832, fig. 687 ; found in the 

 mountain limestone (a western 

 division of the Maucli Chunk red 

 shale formation). XL 



Productus 



? Pal, Ohio, Vol. % 1875, pages 282, 283. 



plate 10, fig. 3, view of a ventral valve of an undetermined 

 form of Productus with distinct longitudinal costae, and in 

 various ways differing from P. semireticulatus^ but perhaps a 

 variety of it, from the Ohio Waverly group. Figs. 4t«, profile 

 of cast of a ventral valve ; 5, front view ; ^, showing cast of 

 interior of dorsal valve also and umbonal region, muscle scars, 

 etc., of ventral valve, of a smaller species or variety, found at 

 many places, in Ohio, in the same Waverly formation, X. 



