130 LAMELLIBRANCHS. 



ward. Surface marked only by low concentric folds and fine 

 lines of growth. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Solenopsis solenoides (GEINITZ ). 



Clidophorus solenoides Geimtz , 1866: Carb. und Dyas in Nebraska, p. 25, 



tab. ii, fig. 7. 

 Solenopsis solenoides Meek, 1872: U. S. Geol. Sur Nebraska, p. 223, pi. x, 



fig. 3. 



Shell small, rather compressed, elongated, the length be- 

 ing about four times the height, narrowing posteriorly ; cardi- 

 nal margin nearly straight, erect, less than the entire length of 

 the valves, with a faint external compression or shallow furrow 

 just below it; basal margin broadly convex in outline, the most 

 prominent part being in advance of the middle ; beaks much 

 depressed and compressed, or scarcely distinct from the car- 

 dinal margin, placed within about one-eighth the entire length 

 of the shell from the anterior extremity, and defined in front by 

 a short vertical indentation; anterior side narrowly rounded, or 

 with the upper side sometimes faintly truncated, with a slight 

 slope from the little indentation forward. Surface with fine, 

 regular striae of growth, which are nearly or quite obsolete, 

 excepting on the lower half of the valves. 



Horizon and localities Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Chaenomya minnehaha (SWALLOW). 





 Allorisma minnehaha Swallow, 1858: Trans. St. Louis Acad. Sci., vol. I, 



p. 193. 



Chcenomya minnehaha Meek & Hayden, 1864 : Pal. Upper Mo., p. 43. 

 Chcenomya minnehaha Meek, 1872: U. S. Geol. Sur. Nebraska, p. 217, 



pi. ii,figs. 13a-b. 



Shell of medium size, obliquely elliptic in outline, ventri 

 cose ; anterior border rather sharply rounded above ; posterior 

 margin truncated, narrowly curved below, gaping broadly ; 

 cardinal border curved. Beaks rather prominent, depressed, 

 somewhat incurved, and well forward. Posterior umbonal 

 slopes prominent. 



