38 
Productella coloradoensis Kindle 
1909. Productella coloradoensis Kindle, U.S. Geol. Surv., Bull. 391, p. 17, 
PI. 4, figs. 2-8. 
Locality and Horizon . In the Upper Devonian of Colorado. In the 
Minnewanka region in the Upper Devonian of section 2-38 (r). 
Productella concentrica (Hall) ? 
1857. Productus concentricus Hall, 10th Kept. N.Y. State Cab. Nat. Hist., 
p. 180; P. shumardianus Hall, 1858, Geol. Surv., Iowa, vol. 1, pt. 2, 
p. 499, PI. 7, fig. 12 (not PI. 3, fig. 9); P. concentricus Hall, 1858, 
Geol. Surv., Iowa, vol. 1, pt. 2, p. 517, PI. 7, fig. 3; Productella 
shumardiana Hall and Clarke, 1892, Pal. N.Y., vol. 8, pt. 1, PL 17, 
fig. 7; P. cooperensis Girty, 1899, U.S. Geol. Surv., Mon. 32, p. 528, 
PI. 68, figs. 8a-c, 9a-b; P. concentrica Weller, 1914, Geol. Surv., 
Illinois, Mon. 1, p. 98, PI. 19, figs. 22-34. 
Remarks . The single imperfect pedicle valve identified provisionally 
with this variable species differs mainly in its apparent lack of elongate 
nodes upon the anterior and lateral parts, which frequently unite to form 
low, broad costae. The anterior part of our shell, however, is imperfectly 
preserved and, moreover, Weller shows that upon shells from the type 
locality these nodes are often obsolete. Productella pyxidata has a much 
less gibbous pedicle valve, with larger ears, and is, comparatively, a much 
broader shell. 
Locality and Horizon . In the Lower Mississippian of the Mississippi 
valley, etc. In the Minnewanka region in the Lower Mississippian of 
section 2-25 (R). 
Genus, Productus Sowerby 
Productus ovatus Hall 
1858. Productus ovatus Hall, Geol. Iowa, vol. 1, pt. 2, p. 674, PL 24, fig. 1; 
P. laevicostus ? Hall and Whitfield, 1877, U.S. Geol. Expl. 40th 
Par., vol. 4, p. 266, PL 5, figs. 7-8; P. pileiformis Whitfield, 1891, 
Ann. N.Y. Acad. Sei., vol. 5, p. 582, Pl. 13, figs. 13-14; P. ovatus 
Hall and Clarke, 1892, Pal. N.Y., vol. 8, pt. 1, Pl. 18, fig. 19; P. 
laevicostus Keyes, 1894, Missouri Geol. Surv., vol. 5, p. 41, Pl. 38, 
fig. 1; P. ovatus Keyes, 1894, Missouri Geol. Surv., vol. 5, p. 44; 
P. pileiformis Whitfield, 1895, Geol. Surv., Ohio, vol. 7, p. 470, Pl. 
9, figs. 13-14; P. laevicosta Girty, 1899, U.S. Geol. Surv., Mon. 32, 
p. 534, Pl. 69, figs. 9a-e; P. pileiformis Girty, 1909, U.S. Geol. 
Surv., Bull. 377, p. 26, Pl. 2, fig. 7; Girty, 1911, U.S. Geol. Surv., 
Bull. 439, p. 44, Pl. 4, figs. 1-2; P. ovatus Weller, 1914, Geol. Surv., 
Illinois, Mon. 1, p. 132, PL 16, figs. 1-15. 
Remarks. A single imperfect pedicle valve is identified with this 
species. It has a length of 40 mm. from the umbonal region to the front 
margin and a width of 30 mm. The umbonal region is strongly incurved, 
whereas the front of the valve is gently convex. There is no median sinus 
but this region is gently convex transversely, whereas beyond this the 
