Prod. 



762 



453, figs. 4, 4 A, AB. These are found 1000' above the Potts- 

 ville conglomerate in the Northern Anthracite basin, and there- 

 fore correspond pretty nearly with those of the Great limestone 

 of the western counties, in the Monongahela series. XII to X V. 



Productus pertenuis, Meek. Pal. East Nebraska coal 

 measures, 1872. — In 8. W. Pennsylvania recognized by Steven- 

 son. K3, p. 309.— X///. 



Productus prattenianus, Norwood. Jour. Acad. Nat. Sci. 

 Phila. [2] Vol. 3, 1854, Coal measures. — In W. Pennsylvania 

 found by White, first in the Crawford shales, Shenango shales, 

 Shenango sandstone, 2^\ Waverly oxPocono,X ; then in Mercer 

 lower and upper limsto7ies, in the Conglomerate, XII ; then 

 over the Scruhgrass coal and in the Ferriferous limestone; 

 and by Stevenson in the Freeportupper {Decker^ s creek) shale, 

 all in Lower {Allegheny) productive coal measures, XIII ; 

 then by Stevenson, abundantly, in the Green crinoidal lime- 

 stone of the Pittsburgh Barren measures. (K, 80; K3, 309; 

 L, 36; Q, 34, 62, 200; Q2, 46; Q3, 25, 61, 77, 97, 124. (See P. 

 cora.) XtoXiF. 



Productus punctatus. (Martin, 1809, Petrif. Derb. Lower 





carboniferous and coal measures of England.) Collett's In- 



