SUBCARBONIFEROUS PERIOD. 



315 



Illinois, one of the Cestraeiont sharks ; it must have been of great size, far exceed- 

 ing any reported from Europe. The corresponding plates of the G. contortus are 

 given in fig. 547, reduced to one-third natural size. Fig. 548 A, Cladodus spinosu* 



Fig. 546. 



Fig. 547. 



Fig. 546, Cochliodus nobilis ; 547, C. contortus ( X VQ- 



Newberry & Worthen, from the St. Louis limestone, Missouri ; a, section of the 

 same; fig. 548 B, Carcharopsis Wortheni Newberry, from Huntsville, Ala.; fig. 

 548 C, Orodus mamillaris N. & W., from the Warsaw limestone, Warsaw, 111. 



Fig. 548. 



Fur. 548 A, Cladodus spinosus; 548 B, Carcharopsis Wortheni: 548 C, Orodus mamillaris 



Reptiles. — Fig. 549, Tracks of Sauropus j>rimsevus, one-eighth natural size, 

 discovered near Pottsville, Pa., by Isaac Lea, who has published a memoir upon 

 them in very large folio, with a magnificent full-size engraving of the slab with 

 the footprints. 



The Carboniferous limestone? of Nova Scotia and New Brunswick con- 



