2o; 



and projecting below the hinge line, the shell extending Mbont 

 one-third its length above the hinge line ; surface marked by 

 fine spines above and coarse spine-bearing ridges below. 



Found in the Encrinal limestone, at Section 5. 



Produ('tei>la spinulicosta. Hall. (Fig. 111'.) (Pal. 

 N. Y., Vol. IV., p. ICO, PI. XXTTI.) 



T-. 



Fig. 113. Pioductella spin lUicosla. Part (if braeliial valve enlarged, x 3, to show carili- 

 nal process ; a small pedicle valve ; ventral, lateral, and cardinal views of a gibbous pedicle 

 valve, natural size (from Hall). 



rj^.. 



-^ 



N^N 



t!M£ 



•Jn< 





.i>^ 



Distinguishing Characters. — Broad, semi-elli ptica 1 , or some 

 what orbicular, ontline; strong- 

 ly incurved beak of pedicle valve, 

 which does not ])roject below the 

 hinge line; strongly -wrinkled 

 ears, bearing spines ; several rows 

 of interrupted spine bases, and 

 concentric striae or wrinkles. 



Found in the upper Moscow fig. ii2a. a fragment of shaie with 



^ ^ crushed specimens of Prnductella 



shales, at Section 3 ; the Encrinjd mnnhcosta, preserving the slender 



' ' spmes (from Hall). (Specniieiis of 



limpstmip Stiptm^nra and Dp- *^'^ character are found near the 



unieSLUne, k^llClOpOia cin(l 17e anticline, at Section 3, upper Moscow 



missa beds and shales below, to "^^^^^-^ 



the Strophalosia bed, at Sections 5, 6, 7, 8, in Eighteen Mile 

 Creek and Lake Shore Sections ; Transition and Marcel! us 

 shales, on the Lake Shoi-e. 



Note. — Productelhi sliumardinun. Hall, described on p. 

 157, et seq., of Vol. IV., as occurring in the Marcellus and 

 Hamilton beds on the Lake Shore, is probably identical with 

 P. spinulicosta. 



