Fauna of the Morrow Group 
171 
1888?. Productus Nebrascensis {?). Herrick^ Bull. Sci. Lab. Den. Univ., 
vol. 3, p. 31, pi. 1, fig. 24 ; pi. 3, figs. 25 (?), 25a. 
Waverly group: Licking County, Ohio. 
1892. Productus Nebrascensis. Hall and Clarke, Int. to Study of Brach., 
pt. 1, pi. 22, fig. 7. 
Coal Measures: LaSalle, Illinois. 
1892. Productus Nebrascensis. Hall and Clarke, Pal. N. Y., vol. 8, pt. 
1, pi. 19, figs. 5-7. 
Coal Measures: LaSalle, Illinois. 
1894. Productus nebrascensis. Keyes, Mo. Geol. Surv., vol. 5, p. 48, pi. 
37, figs. 3a-c. 
Upper Coal Measures: Kansas City, Missouri. 
1900. Productus nebrascensis. Beede, Univ. Geol. Surv. Kans., vol. 6, p. 
84, pi. 9, figs. 7-7f. 
Upper Coal Measures: Kansas City, Turner, Eudora, Lawrence, 
Lecompton, Topeka, Manhattan, and Grand Summit, Kansas. 
1903. Productus nehraskensis. Girty, Prof. Paper, U. S. Geol. Surv., No. 
16, p. 370, pi. 5, figs. l-2a. 
Hermosa formation: San Juan region; Ouray, Colorado. 
Rico formation: San Juan region, Colorado. 
Base of Weber formation: Leadville district, Colorado. 
1904. Productus nebraskensis. Girty, Prof. Paper, U. S. Geol. Surv., No. 
21, p. 53, pi. 11, figs. 7-9. 
Coal Measures: Nebraska. 
Naco limestone: Bisbee quadrangle, Arizona. 
1909. Productus nebraskensis. Girty, Bull., U, S. Geol. Surv., No. 389, 
p. 62, pi. 7, figs. 5, 6. 
Manzano group, Abo sandstone: Abo Canyon, Mesa del Yeso, and 
Sandia Mountains; Yeso formation: Mesa del Yeso, New 
Mexico. 
The Morrow collections include a number of specimens which 
fall within the limits of this species as ordinarily defined. In 
general, the material at hand displays a shorter hinge-line and 
more nearly parallel main flanks than characterize the typical 
Coal Measures type but it is not considered expedient to separate 
this form under a different name at present. 
Horizon and locality. Brentwood limestone : Sawney Hollow, 
Oklahoma (Station 210). Kessler limestone: near Brentwood, 
Arkansas (Station 144). Morrow formation: near Wagoner 
(Station 294), Ft. Gibson (Stations ?296 and 303), Choteau 
(Stations 298 and 306), and Gore (Station 304), Oklahoma. 
