424 PROCEEDINGS OF THE NATION.AL MUSEUM. vol.56. 



PLATVSTKOPHIA MORITURA Cuinings. 



Plate 46, figs. 25-28. 



Platystropkia lynx Cumings, Amer. Journ. Sci., ser. 4, vol. 15, 1903. p. 24. 

 Platystropkio lynx var. morit.ura Cumings, 32d Ann. Rept. Dept. Geol. Nat. Res. 

 Indiana, 1908, p. 920. pi. .35, fig. 5, 5rt. 



This is a transverse ventricose form with a hinge hne longer than 

 the width across the middle. The bracliial valve is inflated toward 

 the umbo; the lateral slopes are convex with a slight tendency toward 

 concavity next to the cardinal angles. The sloj^es of the pedicle valve 

 are sHghtly concave. The fold ranges in elevation from low with sub- 

 equal ])lications to moderately elevated with the two median plica- 

 tions somewhat stronger than the laterals. The sinus is deep in front. 

 The transvei-se forms are restricted to the I'pper Richmond, but sub- 

 quadrate forms, which evidently belong to this s]iecies, are common 

 in the Liberty beds of Kentucky and Indiana. This narrow variety 

 seems to represent transitional forms between this s]iecies and 

 Platystroyhia annieana. 



Measurement of a vnde specimen. — 30 mm. along the hinge line, 29 

 mm. wide, 20.5 mm. high, 21 mm. thick, 14 mm. sinal width, 14 mm. 

 sinal depth, 5 mm. fold height. 



Occurrence. — Richmond grouj): Whitewater formation: Richmond 

 and northern Ripley County, Indiana. Liberty beds: Railroad cut 

 just east of Eastwood, one-fourth mile east of Fisherville, Kentucky. 



Plesiof/y pes. —Cat. Nos. 65671, 65674, U.S.X.M. 



PLA TVSTROPHIA ACUTILIRATA (Conrad). 



Plate 45, figs. 20-21. 



Delthyrn acutiiirata Conrad, Journ. Acad. Nat. 8ci. Pliila., vul. 8, 1842, p. 260, 



pi. 14, fig. 15. 

 Orthis (Platystropkia) acutiiirata Meek, Pal. Ohio, vol. 1, 1873, p. 119, pi. 10, 



fig. 5. 

 Orthis biforata var. acutiiirata White (part), 2nd Ann. Rept. Indiana Bur. Stat, and 



Geol., 1880, p. 487, pi. 2, figs. 5-9; 10th Rept. State Geol. Indiana, 1881, p. 



119, pi. 2, figs. 5-9. 

 Orthis acutiiirata Miller, Cincinnati Quart. ,Iour. Sci., a^oI. 2, 1875, p. 28. 

 Orthis (Platystrophiu) hi/oratn var. acutiiirata Lesley, Geol. Sur. Penna., Rept. 



p. 4, 1889, p. 508, figs. 

 Platystrophia acutiiirata Hall and Clarke, Pal. New York. vol. 8, pt. 1, 1892, p. 



223.— FoERSTE, Amer. Geol.. vol. 31, 1903, p. 340.— Cumings, Amer. Journ. 



Sci., ser. 4, vol. 15, 1903, pp. 33, 35, fig. 18 (part), p. 36, fig. 19 (part).— Grabau 



and Shimer, North Amer. Index Fossils, vol. 1, 1907, p. 258, fig. 308f. — 



Cumings, 32nd Ann. Rept. Dept. Geol. Nat. Res. Indiana, 1908, p. 912, pi. 35, 



fig. 3-3f/ (part).- Foerste, Bull. Sci. Lab. Denison Univ., vol. 16, 1910, p. 



65, pi. 3, figs. 6, 7, Sa-h; pi. 4. fig. 9. 

 Platystrophia acutiiirata senex Cumings, 32nd Ann. Rept. Dept. Geol. Nat. Res. 



Indiana, 1908, p. 913, pi. 35, fig. 4 (not 4a-c). 

 ? Spiri/er shepardi Castelnau, Essai Syst. Sil. Amer. Sept.. 1843, p. 42, pi. 



14, fig. 15. 



