37 
5, p. 53 (date of imprint, 1894) ; Weller, 1899, Acad. Sci., St. Louis, 
Trans., vol. 9, p. 15, PL 4, fig. 10; C. loganensis Girty, 1899, U.S. 
Geol. Surv., Mon. 32, pt. 2, p. 525, PI. 68, figs. 5a-5c; C. illin - 
oisensis Weller, 1900, Acad. Sci., St. Louis, Trans., vol. 10, p. 67, 
PI. 1, fig. 14; C. sp. cf. C. illinoisensis Weller, 1901, Acad. Sci., 
St. Louis, Trans., vol. 11, p. 151; C. illinoisensis Girty, 1903, 
XJ.S. Geol. Surv., Prof. Paper 16, p. 279; Weller, 1914, 111. Geol. 
Surv., Mon. 1, p. 81, PL 8, figs. 63-70. 
Remarks . Our single specimen is apparently a good example of this 
species. 
Locality and Horizon . Lower Mississippian of the Mississippi valley 
and west. In the Minnewanka region in the Lower Mississippian of 
section 2-26 (R). 
Genus, Productella Hall 
Productella pyxidata Hall 
1858. Productus pyxidatus Hall, Geol. Iowa, vol. 1, pt. 2, p. 498, Pl. 3, 
figs. 8a-e; P. shumardianus Hall, 1858, Geol. Iowa, vol. 1, pt. 2, 
p. 499, Pl. 3, fig. 9 (not Pl. 7, fig. 2); Productella pyxidata Hall, 
1883, Rept. N.Y. State Geol. for 1882, Pl. (17) 48, fig. 34; Hall 
and Clarke, 1892, Intr. To Study Brach., pt. 1, Pl. 21, figs. 20, 23; 
Hall and Clarke, 1892, Pal. N.Y. , vol. 8, pt. 1, Pl. 17, fig. 34, Pl. 
17A, fig. 14; Keyes, 1894, Mo. Geol. Surv., vol. 5, p. 52, Pl. 38, 
figs. 4a-d; Rowley, 1908, Mo. Bureau Geol. and Mines, vol. 8, 2nd 
ser., p. 77, PL 17, figs. 5, 30-36; Weller, 1914, 111. Geol. Surv., 
Mon. 1, p. 100, Pl. 19, figs. 1-21. 
Remarks. Our specimens differ from P. blairi in the less prominent 
umbonal region and narrow median sinus of the pedicle valve, and in the 
less pronounced radial ornamentation. They resemble Productella depressa 
Kindle of the Ouray Devonian of Colorado in the moderate convexity of 
the pedicle valve, and in the small and inconspicuous beak and umbo, 
but differ in the much smaller size, narrower and weaker sinus, less defined 
ears, and shorter hinge-line. Productella concentrica (Hall) is much more 
strongly concavo-convex. The Minnewanka form apparently has more 
regular concentric wrinkles than the Missouri form. 
Locality and Horizon. Lower Mississippian of Missouri. In the 
Minnewanka region in the Upper Devonian of section 2-38 (r). 
Productella cf. laminatus Kindle 
1909. Productella laminatus Kindle, U.S. Geol. Surv., Bull. 391, p. 18, 
Pl. 4, figs. 13-14. 
Remarks. A single, small, slightly imperfect pedicle valve is identified 
provisionally with this species. The concentric bands are strongly marked; 
there are Beven preserved. Much of the surface is partly exfoliated, but 
where preserved shows numerous fine spines. 
Locality and Horizon . In the Upper Devonian of Colorado. In the 
Minnewanka region in the Upper Devonian of section 2-38 (R). 
