160 University Geological Survey of Kansas. 



then curving abruptly forward parallel to the ventral margin to 

 the middle of the shell, where it becomes too indistinct to trace 

 in our specimens. Measurements of a specimen a little below 

 the average size and a larger specimen: Length, 56 mm., 76 

 mm.; height, 24mm., 33 mm.; convexity, 15 mm., 25 mm., 

 respectively. 



Range and distribution : Near the junction of the Upper and 

 Lower Coal Measures, at Porterville, Kan., and Westport, Mo. 



Solenomya radiata. Plate XXII, figs. 5-5b. 



Solenomya radiata Meek and Worthen, Proc. Acad. Nat. Sci. Phil., p. 



457, (1860). 

 Solenomya radiata Meek and Worthen, Geol. Surv. 111., nx, p. 349, pi. 



xxvi, ff. 10a, b, (1866). 



Meek and Worthen's description: " Shell thin, narrow ob- 

 long-oval or subelliptical, moderately convex, nearly closed at 

 the each end; pallial margin rather straight or very slightly 

 contracted along the middle, and rounding up more gradually 

 in front than behind ; anterior (longer) side narrowly rounded, 

 its most prominent part being above the middle ; posterior 

 (shorter) side narrowly rounded below and obliquely subtrun- 

 cate above ; dorsal outline nearly parallel to the base ; beaks 

 much depressed, located less than one-fourth the entire length 

 of the shell in advance of the posterior extremity. Surface 

 with obscure marks of growth, crossed by flat, nearly obsolete 

 radiating plications, which are sometimes separated, near the 

 middle of the valves, by spaces greater than their own breadth ; 

 plications very oblique and more closely arranged on the an- 

 terior side. Length, 1.17 inches; height, 0.47 inch; convex- 

 ity, about 0.33 inch." 



Range and distribution : Upper Coal Measures ; Topeka. 



