310 



NORTH-CAKOLINA GEOLOGICAL STTKVEY. 



AMPHIDETUS VIRGINIANUS.* FORBES. (Fig. 245.) 



"Body broadly ovate, elevated and truncate posteriorly ; 

 back oblique ; dorsal impression lanceolate ; scutab area very 

 slightly excavated ; ambulacral spaces broad, triangular, de- 

 pressed ; interambulacral spaces slightly convex ; anteal fur- 

 row broad and' shallow, sides slightly gibbous ; sub-anal im- 

 pressions broadly ob-cordate ; post-oral spinous space broadly 

 lanceolate. Edw. Forbes." 



FIG. 245. 



<r, lower area ; &, upper area ; c. posterior area, showing 

 the relation of the sub-anal impression. Usually found in 

 fragments in the miocene of North-Carolina. 



* Journal of the Geological Society, Vol, 1, p. 425, 



