6gS 



NORTH AMERICAN INDEX FOSSILS. 



Fig. 1002. a, Fusispira inflata; b, F. subbrevis ; c, F. sub/usiformis ; d, F. convexa; 

 e> F. angusta, all X %• (After Ulrich, Pal. Minn.) 



LXXXVI. Meekospira Ulrich. 

 Whorls nearly flat, embracing to ambitus, regularly enlarging ; 

 aperture short, rounded below, acute above ; inner lip visible gen- 

 erally only in lower half of aperture. Ordovicic ?-Carbonic. 

 303. M. peracuta M. and W. (Fig. 1003, a y b.) Carbonic. 



Fig. 1003. a, b, Meekospira peracuta; c, d, M. nitidula. (After White, 13th Ind. 



Rep.) 



Slender, with acute apex, 12 or more volutions, nearly flat; 

 sutures scarcely impressed. 



Coal measures of Illinois, Indiana (?), and Missouri. 

 304. M. nitidula M. and W. (Fig. 1003, c y d.) Carbonic. 



Less slender, with 8 or more somewhat more convex volutions 

 last one somewhat longer than half the length of the shell. 



Coal measures of Illinois and Indiana. 



