SHUMARD AND SWALLOW—wNEW FOSSILS. 207 
Missouri State collection from the’ Middle Coal Measures at 
xington, Mo. 
CaRDIOMORPHA hisses Shumard. 
hed; ma buccal m argins str sour rounded, the latter 
being very short ; umbonial region moderately convex in young 
specimens and very gibbous in the old, greatest convexity a 
= distance below the beaks; beaks situated near the na 
margin, rounded, closely incurved and nearly a i 
paar surface. marked with’ ve ry fine, ¢ pores, spancatiic 
striw, Ww which are sometimes Apne or less fox 
rar wn cette. ag .30; height, 
das hike gth o grown sp gh 
_ This an a Ae much in proportions at different periods of 
Pos. and Loc.—Oceurs in dark septaria of the Coal 
Pie at Charbonniere, St. Louis County, and at Lexing- 
bans Aide Missouri State collection. 
_.. Lepropomus eranosvs, Shumard. 
iii al usuall _ very gibbous, clongate-subguadratey thin, 
¥3 
sg about one-third less than the le ‘but vari- 
ect; anterior extremity oblique above — 
07 straight and su 
