476 University of Kansas Geological Survey. 



entirely across from the inner side to and over the periphery, in 

 passing upon which they bifurcate, or give off lateral branches, 

 so that the whole, with some intercalated ones, assume there a 

 uniform size." Septa, as shown in an imperfect specimen, ob- 

 scure, simple, and provided with at least two lateral lobes which 

 are but obscurely divided. Siphonal lobe not prominent, and 

 has two short terminal divisions. Other details are entirely 

 wanting. Length, thirty-eight mm. ; height, thirty mm. ; con- 

 vexity, fourteen mm. 



This species occurs moderately abundant in the Septaria hori- 

 zon of the Fort Benton group in the outcrops on the White Rock 

 in Jewell county, and in similar ones on the Saline river. 



Scaphites ventricosus M. & H. PI. civ, figs. 8-10. 



Scaphites ventricosus M. & H., 1862, Proc. Acad. Nat. Sci. Phil., p. 22; 

 Meek, 1876, U. S. Geol. Surv. Terr., vol. ix, p. 435, pi. vi, ff. 7a, b, and 

 8a, b; Stanton, 1892, Bull. U. S. Geol. Surv. No. J06, p. 186, pi. xliv, ff. 

 8-10; pi. xlv, f. 1. 



Revised description : ''Shell medium size, ventricose, oval, 

 broadly rounded over the periphery ; inner turns closely in- 

 volute ; deeply embracing, and composing a large portion of the 

 entire body ; deflected portion very short ; umbilicus very small 

 and deep; aperture transversely sublunate or reniform, but 

 deeply sinuous, and but slightly disconnected from the inner 

 turns on the inner side ; surface ornamented with costse that 

 pass nearly straight over the periphery, where they are of 

 uniform size, excepting their gradual enlargement with the 

 volutions, while on the sides of the last or outer volution, about 

 every fifth or sixth one is larger and more prominent than the 

 intermediate ones, which latter do not extend inward to the 

 umbilical margin. The septa are provided with deeply divided 

 lobes or sinuses. Siphonal lobe longer than wide, and bearing 

 on each side of its very slender body three branches, the two 

 terminal of which are slightly larger than the succeeding lateral 

 ones, and each unequally bifid and digitate ; first lateral sinus 

 as large as the siphonal lobe, very narrow at its base, and pro- 

 foundly divided at its extremity into two unequal branches, of 

 which the one on the siphonal side is larger than the other, 



