Prod. 



750 



conglomerate of Stevensonj or 1100' beneath the Lackawaxen 

 {Chemung tipper) conglomerate. The same species (?) appears 

 also in the Haun's bridge section, at 450', and at 300' beneath 

 upper conglomerate, that is, nearly top of Chemung, VIII g, 



Productella hystricula, Hall. Pal. N. Y. Vol. 4, 1867, 



Viii 



6 J IzSfored, 



7M ?r7yy?zi//MXZ, 



Hal/: 



FnLN}/. 



ValJV^ 



IS 67. 



page 178, plate 26, fig. 1, 2, impressions of dorsal valves; 3, 4, 

 5, casts of ventral valv^es; 6, a restored specimen, showing the 

 spines as Dreserved in impressions in the sandstone ; 7, en- 

 larged twice, dorsal interior to show hinge process and small 

 dental sockets ; 8, enlarged twice, hinge view of ventral cast, 

 showing narrow area and bilobed apex. These shells occur in 

 great numbers, the spines being commonly of the proportional 

 size shown in fig. 6, in a hard sandstone at Forestville, Ohau- 

 tauque Co., in friable sandstone at Oonewago, and in limy layers 

 at E. Randolph, Cattaraugus Co., N. Y. — It has not been re- 

 ported in Pennsylvania. — Chemung. Vlllg. 



Productella lachrymosa (Strophomena lachrymosa. Con- 



Hall 

 Pali 



Vol 



^^ 

 pJ7Z,F/ate2S^ 



