15 



Found by R. A. Blair, S. A. Miller aud Miss Jessie Blair, in 

 whose honor we have proposed the specific name, in the Chouteau 

 linipstoue, near Sedalia, Missouri, and now in the collection of S. 

 A. Miller. 



Family MODIOMORPHID.E. 



ELYMELLA MISSOURIENSIS, n. Sp. 



Plate II, Fig. 11, left valve; Si(j Vi, airdinal view of <i c<ist. 



Species medium size. Shell subelliptical, narrower in front. 

 Length twice as great as the height. Cardinal line straight pos- 

 terior to the beaks, but abruptly dropping in front. Anterior end 

 narrowly rounded. Posterior end broadly rounded. Basal margin 

 rounded more gently at the anterior than at the posterior end. 

 Lunnule deeply impressed. Posterior cardinal slope concave. 

 Valves convex aud somewhat gibbous in the umboual region. 

 Beaks at the anterior end rounded and incurved over the cartiinal 

 line. Umbones high and liroadly rounded. Posterior umboual 

 slope Bubangnlar at first, but the angularity gradually fades away 

 and the undioual ridge is merged into the general conve.xity of tl e 

 shell. Surface marked by fine concentric stria^ growth. 



There may be some doubt about the reference of this species 

 to ElymeUd, as it is quite distinct from the forms Hall referred 

 to that genus. ]3ut we think it resembles ElymeUd more than 

 Modiomorpha and it certainly belongs to one of the genera. In 

 fact Hall only regarded Elymella as a subgenus of Modiomorpha 

 but we prefer to treat them at present as distinct genera. 



Found by B. A. Blair in the Choufeau limestone, near Sedalia, 

 Missouri, and now in the collection of S. A. Miller. 



CVPIUCARDELLA EXIMIA, n. sp. 



Plate II, Fi(j. -JT), left valve iinlh posterior end broken off. 



Species medium size. Shell subrhomboidal (o subtriangular. 

 Length one-half greater than the height. Anterior end abruptly 

 truncated anterior to the beaks and then prolonged at th(^ antenv 

 basal extremity and abruptly rounded into the basal margin. Car- 

 dinal line arcuate. I'osterior margin oMicjue'y truncated, pro- 

 longed at the post basal extremity and rapidly rounded into the 

 basal margin. Basal margin broadly aud regularly rounded. 

 Beaks at the anterior end and obtuse. Umbones prominen^ Um- 



