236 
Kirtley F. Mather 
EUOMPHALID^ 
Genus STRAP AE 3LLUS Montfort 
Straparollus cf. spergenensis (Hall) 
, Plate XVI, figure 9. 
1856. Euomphalus Spergenensis. Hall, Trans. Albany Inst., vol. 4, p. 19. 
St. Louis limestone: Spergen Hill and Bloomington, Indiana. 
1882. Euomphalus Spergenensis. Whitfield, Bull. Am. Mus. Nat. Hist., 
vol. 1, p. 69, pi. 8, figs. 16-19. 
St. Louis group: Spergen Hill, Paynter’s Hill, Bloomington, and 
Ellettsville, Indiana. 
1883. Euomphalus Spergenensis. Hall, 12th Rep. Geol, Surv. Ind., p. 350, 
pi. 31, figs. 16-19. 
St. Louis group: Spergen Hill, Lanesville, and Bloomington, In- 
diana. 
1894. Straparollus spergenensis. Keyes, Mo. Geol. Surv., vol. 5, p. 159. 
St. Louis limestone: St. Louis, Missouri. 
1903. Straparollus cf. spergenensis. Girty, Prof. Paper, U. S. Geol. Surv., 
No. 16, p. 313. 
Leadville limestone: Leadville district, Colorado. 
1906. Straparollus spergenensis. Cummings, 30th Ann. Rep. Geol. Surv. 
Ind., p. 1337, pi. 25, figs. 16-19. 
Salem limestone: Spergen Hill, Paynter’s Hill, Bloomington, El- 
lettsville, Stinesville, and Harrodsburg, Indiana. 
From the Morrow formation in one locality were obtained 
several specimens of a Straparollus scarcely distinguishable 
from the Mississippian form described by Hall. The shells at 
hand are nearly or quite flat, displaying only a slight tendency 
toward the development of a spire. In comparison with speci- 
mens from Spergen Hill the only difference discernible is the 
somewhat more rapid expansion of the Morrow individuals in 
the youthful stages, so that in specimens of the same diameter 
there are generally one or two more volutions in the typical 
material than in the forms from Oklahoma. 
Horizon and locality. Morrow formation: near Choteau, 
Oklahoma (Station 302) . 
Genus EUOMPHALUS Sowerby 
Euomphalus catilloides (Conrad) 
Plate XV, figure 
1842. Inachus catilloides. Conrad, Jour. Acad. Nat. Sci., Phil., 1st ser., 
vol. 8, p. 273, pi. 15, fig. 3. 
Carboniferous: Inclined plane of the Allegheny Mountains. 
