Prod. 



748 



Tioga Oo., N. Y. Chemung beds^ Spec. 884-4: (two dorsal 

 valves) came from Lycoming Co. west line of Anthony town- 

 ship, bet. Marshall's and Stabler's. Chemung, VIII g. 



Productella costatula, Hall. Pal. N. Y. Vol. 4, 1867, page 



vm ^. 



f 



orm. 



NXVoljy 

 Jb. ISO 



180, plate 26, figs. 9 to 15. Characterized by small ribs. The 

 dorsal valves, interior surface alone known, are deeply con- 

 caved. Inner surface strongly papillose- striate and shows con- 

 centric striae. Species somewhat like P, dumosa^ of the Ham- 

 ilton rocks. Dorsal valve like P. striatula. but can be distin- 

 guished by its numerous minute pustules inside. Many places 

 in New York in Chemung formation, — In Pennsylvania col- 

 lected by Carll & Randall at Warren (C. E. Hall's MS. Rt. 1576), 

 from Upper Chemung strata. VIII g. 



Productella exanthemata ( Productus exanthematus^ Hall. 



lOthRe- 



gents' 



it e port 



1857). 



Ilamil ' 



HalLFcU.N.V. V0/.4. plates 2S,2l> ^^.^ ^p. 



parently covered with pustulous eruptions. — Hall. Pal. N. Y. 

 Vol. 4, 1867, page 163, plate 23, figs. 45, 46, interiors of dorsal 

 valves, natural size ; plate 25, figs. 12, 13, interiors of dorsal 

 valves; differing all from interiors ot P, shumardiana ; and 

 from similar shells from the Corniferous ; but all may turn out 

 to be varieties of one species. From Hamilton heds on Seneca 



