623 



Peplo. 



Peplorhina anthracina, Gox>e, Seep, 622. 







{Continuatiou of Periplectrodus cornpressus.) 



Sur. 111., Vol. 6, 1875, page 326, plate 8, figs. 26 a, to c. From 

 Upper beds of St. Louis (Suh-carh.) limestone. Alton, 111. — 

 XL 



Periplectrodus expansus, {Figure given under P. com- 

 pressus), St. John & Worthen Geo. Sur. 111., Vol. 6, 1875, 

 page 327, plate 8, figs. 27 a to c, of a unique example of per- 

 fect fish-tooth, except that the middle crown cusp is broken off" ; 

 from Chester, 111. in the Chester (Suh-carh.) limestone. XI. 



