24 Hill Paleontology of the Trinity Division. 



This variety is named for Mr. G. H. Ragsdale, the naturalist, 

 of Gainesville, Texas. 

 Thus far this variety has only been found at Glen Rose. 



Pecten stantoni sp. nov. 

 Plate II, Fig. 3, 3o. 



Shell small, one and one-half inches in length, strongly eared, 

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

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

 strong, flattened, double ribs, each with a sinus its entire length, 

 alternating with small single ribs, and by minute cross-lines. 

 This marking distinguishes it from the IWrt-like forms of the 

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

 known. 



This beautiful species occurs in the molluscan fauna at the 

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

 mens have been found. Two of the specimens ,were very perfect, 

 but were unfortunately lost in the removal of my collections 

 from Cornell University. 



This species is named for Mr. T. W. Stanton of the U. 8. Geo- 

 logical Survey. 



Modiola branneri sp. nov. 

 Plate V, Figs. 8, 9, 10. 



Modiola sp. indet. Hill. Arkansas Geological Survey, Annual 

 Report 1888, vol. n, p. 133, 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 

 atumbonal region ; umbones pronounced and rapidly narrowing 

 to a rounded point; anterior portion somewhat flattened ; pos- 

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

 surface smooth, lustrous, marked by fine lines of concentric 

 growth and faint radiating stria?. 



This well-preserved little Modiola occurs sparingly in the lower 

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

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

 inally figured, but not named, in my Arkansas report. 



