Prod. 



764 



Productus semireticulatus (costatusf) Martin's Euro- 



t'P!.24. 



pean species, generally 

 recognized widely 

 throughout the Amer- 

 ican Lower carhonifeT- 

 niferous and C oal 

 measures. o 1 1 e 1 1 ' s 

 Indiana Keportof 1883, 

 page 125, plate 24, figs. 

 1, 2, 3, natural size., 

 and large specimen. 

 — Dawson's Acadian 

 Geology ,1868,page 297, 

 97 figs. 97 a, ventral 

 valve, 5, small 

 specimen showing 

 dorsal valve. This 

 universal Carboni- 

 ferous fossil shell, 

 has been named 

 Producta martinis 

 concinna ., anti- 

 quata^ scotioa., and spinosa, var. of martini. (But spin- 

 osa of Sowerby is a distinct species.) Largest found in any 

 part of Nova Scotia, 1| inches long and broad. XIII. — In 

 Western Pennsylvania it is found by White in the Ferriferous 

 Ihnestone of Beaver, Butler, Lawrence and Mercer Cos. (Q, 



