24 nill—Pal('0)dolo<jy of the Triniiu Division. 



This variety is named for Mr. G. H. Ragsdalc, tlie naturalist, 

 of Clainesville, Texas. 



Tlius far tliis variety has onl}^ been found at (Jlcn Hose. 



Pecten stantoni s^p. nov. 



Plate II, Fitr. 3, Sn. 



Shell small, one and onedialf inches in Icniifth, strono;l_y eared, 

 and ears rugose, the riglit one (not shown in figure) being marked 

 by a deep fold. The surface of the larger valve is marked by 

 strong, liattened, double ribs, each Avith a sinus its entire length, 

 alternating with small single ribs, and l)y minute cross-lines. 

 This marking distinguishes it from the Vola-Y\ke forms of the 

 upper half of the Comanche Series. The smaller valve is not 

 known. 



This beautiful species occurs in the molluscan fliuna at the 

 plant bed on Paluxy creek, near Glen Rose; only three speci- 

 mens have been found. Two of the specimens were very })erfect, 

 but were unfortunately lost in the removal of my collections 

 from CV)rnell University. 



This species is named for Mr. T. W. Stanton of the U. S. Geo- 

 logical Survey. 



Modiola branneri pp. nov. 



Plate V, Figs. S, 9, 10. 



I\[()di(il(i sp. indet. Hill. Arkansas Geological Survey, Annual 

 Report 1888, vol. ii, p. loS, plate ii, figs. 18, 19. 



Shell small, elongate, from one-half to one and three-quarters 

 of an inch in length, elongated sub-triangulate, greatly thickened 

 at umbonal region ; innl)()nes pronounced and ra])idly narrowing 

 to a rounded jjoint; anterior portion somewhat thittened ; |)os- 

 terior portion attenuated, thin, and strongly curving in outline ; 

 surface smooth, lustrous, marked ]\v fine lines of concentric 

 growth and faint radiating stria\ 



This well-})reserved little Madinla occurs sparingly in the lower 

 Glen Rose beds at the gypsum bluffs of the Little Missouri, 

 Arkansas, and in the plant bed near Glen Rose. It was orig- 

 inall}^ figured, but not named, in my Arkansas report. 



