SUBCARBONIFEROUS PERIOD. 



315 



one of the Cestraciont sharks, and must have been of great size, far exceeding 

 those reported from Europe. The corresponding plates of the C. contortus are 

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



Fig. 546. 



Fig. 547. 



Tig. 546, Cochliodus nobilis ; 547, C. contortus ( X %)• 



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. 



Fig. 548 A, Cladodus spinosus; 548 B, Carcharopsis Wortheni; 54S C, Orodus mamillaris. 



Reptiles. — Fig. 549, Tracks of Sauropus 2»'imsevxis, 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 limestones of Nova Scotia and New Brunswick con- 



