640 NORTH AMERICAN INDEX FOSSILS. 



115. W. subscalaris (Meek and Worthen). (Fig. 869.) 



Carbonic. 



Large ; early whorls embracing to near periphery, later showing 

 space below carina equal to shoulder. Lower carina strong ; 

 spirals and nodulations subdued. 



Coal measures of Illinois and Missouri. 



1 16. W. speciosa (Meek and Worthen). (Fig. 870. ) Carbonic. 



Fig. 870. Worthenia speciosa; a, b, opposite views, nat. size; c, enlargement of part 

 of surface. (After Meek and Worthen, Pal. 111., II.) 



Less than half the size of the preceding, of seven or more volu- 

 tions, whorls embracing to within half the shoulder width of the 

 carina ; slit-bearing angulation and lower carina strong ; shoulder 

 slightly concave, with growth lines strengthened at regular inter- 

 vals ; spirals numerous, fine. 



Coal measures of Illinois, Missouri, and Oklahoma. 



XXXV. Liospira Ulrich and Scofield. 



Pleurotomariod shells with low spire, subrhomboidal volutions, 

 which are flat, gently convex or slightly concave above, and not 

 infrequently angular at the edge of the umbilicus. The aperture 

 is deeply notched and the band is scarcely distinguishable. Ordo- 

 vicic. 



117. L. micula (Hall). (Fig. 871, a-d.) Ordovicic. 

 Small ; whorls flattened and continuous in the spire, the suture 



scarcely depressed. Umbilicus filled by reflex callosity of lip. 



Trenton group of Kentucky ; Eden and Lorraine (?) (Maquo- 

 keta) of Minnesota, Wisconsin, Illinois, Iowa, Ohio, and Ken- 

 tucky. 



118. L. progne (Bill). (Fig. 871, e-g.) Ordovicic. 

 Like L. micula, but about twice as large or more. 



Stones River and Black River beds of Canada, Kentucky, Ten- 

 nessee, and Minnesota. 



