132 KANSAS UNIVERSITY QUARTERLY. 



Solenomya trapezoides Meek*. Plate XXXIV, Figs. 2a, 2b 



Shell large, subelliptical in outline, length from two to two and 

 one-half times the height, convex, open at both ends. Ventral 

 margin slightl}' convex, curving abruptly upward on the posterior 

 extremity and more gently on the anterior, posterior side obliquely 

 truncated above; hinge straight in front of the beaks which are de- 

 pressed, approximate, located about one-fourth the length of the 

 shell from the posterior extremity. Surface marked by rather ob- 

 scure concentric undulations of growth, crossed by faint radiating 

 striae which seem to radiate from the beak. Posterior adductor 

 scar moderately prominent, more or less irregularly subcircular; 

 the ridge in front of the scar is broad and its outline is rather indis- 

 tinct, nearly perpendicular to the hinge, curving backward below; 

 anterior scar indistinct, somewhat subcircular; pallial line extend- 

 ing backward and downward from the lower side of the posterior 

 s.car, 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, 76 mm.; height, 24, 33 mm.; con- 

 vexity, 15, 25 mm.; respectively. 



Found in the rocks near the junction of the Upper and Lower 

 Coal Measures, Westport, Mo., and Porterville, Kansas. 



There can be but little doubt but that this shell is specifically 

 distinct from S. solcniformis Cox. It is abundant at Westport, and 

 we also have a specimen from Peoria county, Illinois. The only 

 manner in which the specimen at hand seems to differ from the 

 species to which it is referred is in the possession of faint radiating 

 striae, which do not seem to appear on specimens that are worn. 



Nucula pulchella n. sp. Plate XXXIV, Figs. 5a, 5b, 5c. 



Shell very small, subtrigonal in outline, ventricose; anterior 

 border straight, rounding abruptly to the ventral margin which is 

 rounded, posterior abruptly truncated nearly at a right angle with 

 the ventral margin. Beaks prominent, incurved, situated nearly 

 at the posterior end of the shell, lunule not well defined. The 

 greatest convexity is at the umbo. The surface is ornamented by 

 fine, elevated, concentric stri?e and undulations of growth. 



Measurements: Length, 4^ mm.; height, 3^ mm.; convexity, 

 3 mm. 



Found at Cameron's Bluff, near Lawrence, Kansas. Type in 

 Mr. Rogers' collection. 



*S<)le)tom!ja sp, Meek and Worthen, Gaol. Surv. 111., v, pi. xxvii, f. la-b, \SV}. 

 *Sote7ioinya trapezoides Meek, Amer. Jour. Sci., (3) vii, pp. 58i-583, 1874. 



