44 
Ann. Rept., 1885, p. 453, fig. 4 c; p. 440, figs. 4-4 b; P. neb- 
rascensis Hall and Clarke, 1892, Pal. N.Y., vol. 8, pt. 1, PI. 19, figs. 
5-7; Keyes, 1894, Missouri Geol. Surv., vol. 5, p. 48, PI. 37, figs. 
3 a-c; Beede, 1900, Univ. Geol. Surv., Kansas, vol. 6, p. 84, PI. 9, 
figs. 7-7 f; Girty, 1903, Prof. Paper 16, U.S. Geol. Surv., p. 370, 
PI. 5, figs. 1-2 a; Girty, 1904, U.S. Geol. Surv., Prof. Paper 21, 
p. 53, PL 11, figs. 7-9; Girty, 1909, U.S. Geol. Surv., Bull. 389, p. 62, 
PL 7, figs. 5, 6; Pustula nebraskensis Mather, 1915, Bull. Sci. Lab. 
Denison Univ., vol. 18, p. 169, Pl. 9, figs. 6, 7. 
Remarks. The Minnewanka shell differs from the typical Mississippi 
Valley Pennsylvanian form in the greater obscurity both of the concentric 
wrinkles in the umbonal region and of the concentric bands of spine bases. 
There is, moreover, no evidence of the set of large erect spines which occur 
with the small appressed ones noted above. In these respects it agrees 
with the form noted by Girty 1 from the Manzano group of New Mexico. 
Locality and Horizon. In the Pennsylvanian throughout North America. 
In the Minnewanka region in the Pennsylvanian of section 3 a-5 (r). 
Genus, Schizophoria King 
Schizophoria striatula (Schlotheim) 
1813. Anomia terebratulites striatulus Schlotheim, Min. Tauschenbuch, 
8, Pl. 1, fig. 6; Orthis striatulus Davidson, 1865, Brit. Devonian 
Brach., Pal. Soc., p. 87, Pl. 17, figs. 4-7; Orthis impressa Hall, 1867, 
Pal. N.Y., 4, p. 60, Pl. 8, figs. 11-19; Ibid, Whitfield, 1882, Geol. 
Wisconsin, p. 326, PL 25, figs. 13-15; Ibid, Walcott, 1884, U.S. 
Geol. Surv., Mon. 8, p. 115, PL 13, fig. 13; Ibid (genus Schizo- 
phoria) Hall and Clarke, 1892, Pal. N.Y., 8 ,pt. 1, pp. 212, 216, Pl. 6, 
fig. 31, Pl. 6A, figs. 26, 27; Orthis iowaensis Hall, 1858, Geol. Surv., 
Iowa, pt. 2, p. 488, Pl. 2, fig. 4; Ibid, White, 1881, 10th Ann. Rept. 
State Geol. Indiana, p. 133, Pl. 5, figs. 10-12; Ibid (genus Schizo- 
phoria) Hall and Clarke, 1892, Pal. N.Y., 8, pt, 1, pp. 212, 226, Pl. 6A, 
fig. 29; Ibid, Keyes, 1895, Geol. Surv., Missouri, 5, p. 62, Pl. 38, fig. 6. 
Remarks. The Minnewanka form differs only slightly from the eastern 
type. Compared with a specimen of similar size from Rockford, Iowa, to 
which it is otherwise externally exactly similar, the Alberta form has a 
more convex umbonal region in the brachial valve, and a more pronounced 
sinus in the pedicle valve; both of these are, however, variable characters 
even in the specimens from Iowa. In the former character our form 
approaches the variety australis , but differs from this variety especially in 
the higher cardinal area of its pedicle valve. Kindle founded this variety 
from New Mexico upon these two characters — the notably lower area in 
the pedicle valve and the extremely gibbous character of the umbonal 
region of the brachial valve. Our large specimens, which approach this 
variety most nearly, have the brachial valve less convex and the cardinal 
area of pedicle valve considerably higher. Our largest specimen is 25 mm. 
long by 30 mm. wide with a broad shallow sinus at the front. 
Locality and Horizon. Middle and Upper Devonian throughout North 
America. In the Minnewanka region in the Upper Devonian of sections 
2-38 (C); 4-5 (R). 
i U.S. Geol. Surv., Bull. 389, p. 62. 
