422 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 5t5 



PLATYSTROPHU CLARKSVELLENSIS Foerste. 



Plate 45, figs. 1-4. 



Platystrophia darksvillensis Foerste, Bui!. Sci. Lab. Denisou Univ., vol. 16, 



1910, p. 65, pi. 8, figs. 3, 4. 

 Platystrophia lynx var. laticosta Cumincs, :i2d. Ann. Rep. Dep. Geol. Nat. Rea. 



Indiana, 1908, pi. 85, figs. 2, 2a, 26; Amer. Journ. Sci., ser. 4, vol. 15, 1903, 



p. 32, fig. 1766. 



This is a transverse species which ])ears a marked resemblance to 

 Platystrojihia laticosta. It is narrower than tliat species and has 

 more closely spaced, narrower, and more numerous plications on the 

 slopes, there being seven to nine. It differs, also, from Platystrophia 

 laticosta in that tlie slopes are somewhat fuller, which reduces the 

 height of the fold. The lateral plications of the fold and sinus vary 

 from somewhat weaker than the median plications to about equal 

 to them in strength. The hinge line is generally greater in length 

 than tlie width across the middle, but it may equal it or be somewhat 

 less than the width. 



Specimens witli a long liinge line have the same general aspect as 

 Platystrofliia cundngsi, new species, but tiie latter has a longer hinge 

 and has more numerous plications on the slopes. 



Measurements. — 25 mm. along the liinge line, 23 mm. wide across 

 the middle, 16 mm. high, 15 mm. thick, 11 nmi. sinal width, 10 mm. 

 sinal depth, 4.5 mm. fold depth. 



Occurrence. — Richmond group: Arnheim formation: Seatonvihe 

 and Clark, Kentucky; Waynesville formation: Waynesville and 

 Oregonia, Ohio; Weisburg and numerous other localities in Indiana, 



Plesioty pes. —Cnt. Nos. 65713, 65726, U.S.N.M. 



PL.\TVSTROPHIA CUMINGSI, new species. 



Plate 45, figs. 9-l(J. 



Platystrophia bijorata var. laticosta Hall and Clakke, Pal. Xew York, vol. 8. 



pt. 1, 1892, pi. 5B, figs. (J, 7 (not figs. 5, 8, 9). 

 Platystrophia acutilirala Gumings, Amer. Journ. Sci., ser. 4, vol. 15, 1903, p. 32, 



fig. Vice' (in part); 32nd Ann. Rep. Dept. Geol. Nat. Res. Indiana, 1907, pi. 35, 



fig. 3, 3a. 



In tlie Waynesville member of the Richmond group at Oxford and 

 Waynesville, Ohio, and at Weisburg, Indiana, is a species of Platy- 

 strupliia which jjossesses intermediate cliaracters l)etween Platy- 

 strophia claries villensis and Platystrophia acuiilirata. It resembles 

 the former species in tliat the fold is lower and less compressed than 

 that of Platystrophia laticosta and the lateral plications on the slopes 

 of the fold and sinus are stronger than in that species. It also has 

 a greater degree of ventricosity. The specimens resemble Platy- 

 strophia acutilirata in the possession of acute cardinal extremes and 



