112 University Geological Survey of Kansas. 



LIMA. 



Brugueire, Encycl. Metb., (1791). 

 Deshayes, Desc. de Coq. Foss. des Inv. de Paris, (1824). 



Lima retifera. Plate XIII, fig. 5. 



Lima retifera Shumard, Trans. St. L. Acad. Sci., i, p. 214, (1858); Meek, 

 Fin. Rep. U. S. Geol. Surv. Neb., p. 188, pi. ix, f. 5, (1872). See Weller, 

 Bull. 153, U. S. Geol. Surv., p. 324, (1898). 



Meek's description: "Shell obliquely subovate, moderately 

 convex, apparently not gaping in front ; hinge line short, or 

 between one-half and one-third the antero-posterior diameter 

 of the valves ; base forming a nearly regular semicircular curve ; 

 anterior side extended obliquely forward, rather narrowly 

 rounded below, and straight or slightly concave in outline, with 

 a rather long, oblique slope to the hinge above ; posterior side 

 distinctly shorter than the other, and rounding from near the 

 ear into the base ; ears subequal, the front margin of the ante- 

 rior one forming an obtuse angle with the hinge line, rather 

 distinctly flattened from the swell of the umbo, and somewhat 

 extended along the anterior margin below ; posterior ear a little 

 more convex than the other, with its upper margin incurved, 

 and its lower margin separated from the umbo by a faint ob- 

 lique furrow, sometimes faintly sinuous behind, and nearly 

 rectangular at its extremity ; umbones rather convex or mod- 

 erately compressed, extending very little above the cardinal 

 margin, and placed near the middle of the same ; surface orna- 

 mented by about twenty-five slightly irregular, angular, radiat- 

 ing costal about equaling the spaces between, and occasionally 

 bifurcating on the umbones and lateral margins of the body 

 part of the valves, where they become obsolete ; crossing all of 

 these, as well as on the ears and lateral margins, are numerous 

 fine concentric striae. Height, 15 mm. ; length, 18 mm. 



Range and distribution: Upper Coal Measures; Lawrence, 

 Topeka. 



