New and Little Known Pelecypods from 

 the Coal Measures. 



Contribution from the Paleontological Laboratory No. 46. 



BY J. W. BEEDE AND AUSTIN F. ROGERS. 



With Plate XXXIV. 

 Solenomya parallela. n. sp. Plate XXXIV, Fig. i. 



Shell large, moderately convex, elongate-subquadrate in outline; 

 anterior margin broadly rounded to nearly truncate, meeting the 

 hinge at a little more than a right angle, dorsal and ventral mar- 

 gins straight, nearly parallel, postero-dorsal margin sloping ob- 

 liquely downward, meeting the rounded posterior margin at an 

 obtuse angle. Beaks depressed, incurved, situated about one- 

 fourth the distance from the posterior to the anterior end of the 

 shell. The greatest convexity is at the umbo. The shell gaping 

 a little wider anteriorly than behind. The surface is marked by 

 flat radiating plications, which become obsolete at either end of the 

 shell, the whole surface of which is apparently covered with radiat- 

 ing striae parallel to the plications. Neither the plications nor 

 the strias radiate directly from the beak, but from a point above the 

 beak and a trifle in front of it. These are crossed by fine obscure 

 lines of growth. Tlie anterior and posterior adductors are promi- 

 nent; the posterior one is triangular, located between the beak and 

 the posterior margin, along its anterior side and extending above it 

 is a ridge caused by the thickening of the shell, which produces a 

 slight, obliq'ue furrow in the cast. The anterior scar is located on 

 the upper side of the shell near the anterior angle. The pallial 

 line is indistinct, parallel to the ventral margin curving backward to 

 meet the anterior adductor scar. 



Measurements: Length, 53 mm.; height, 18 mm.; convexity of 

 single valve about 5 mm. 



Specimens of this species have been collected from Kansas City 

 and Lawrence. 



(131) K.AN. UNIV. QUAR., VOL. VIII, NO. 3, JULY, 181)9, SERIES A. 



