195 





' ^^roii. ^ 



Fig 98. Stroiiii'-oilnnUt >/.//,,. s.so. Ventral and dorsal sieus; iuit-rior uf pedicle and 

 brachial valves ; ventral, dorsal and iatei-al views of a large specimen (^from Hall). 



Demissa bed, Sections 5, 6, etc. (abniidant) ; eighteen inches 

 below the Encrinal limestone, at Section 6 (two specimens). 



Stkopheodonta coxcaya. Hall. (Fig. 1)9.) (Pal. N.Y., 

 Vol. IV., p. 96, PL XVI.) 



Distinguishing Characters. — Large size; great convexity 

 of pedicle valve; high areas almost at right angles to each 

 other; surface of pedicle valve bearing coarse, sharp, crenn- 

 lated strife, with commonly one or two between, which are less 

 elevated; surface of brachial valve bearing distant strong- 

 stria^, with a number of finer ones between, all crenulated by 

 concentric stria^; large, spreading diva ricator muscular im- 

 pressions occur in the pedicle valve; in the brachial valve the 



