74 
vol. 4, p. 141, PI. 10, figs. 6 a-c (whole volume published in 1877); 
Athyris subtilita Meek, 1877, U.S. Geol. Expl. 40th Par., Kept., 
vol. 4, p. 83, PI. 8, figs. 6, 6a; White, 1884, Geol. Surv., Indiana, 
13th Rept., p. 136, PL 35, figs. 6-9; Seminula subtilita Hail and 
Clarke, 1893, Pal. N.Y., vol. 8, pt. 2, p. 95, figs. 66, 67 on p. 95, 
and figs. 58, 59 on p. 86, PL 47, figs. 17-31; Girty, 1903, U.S. Geol. 
Surv., Prof. Paper 16, p. 403, Pl. 7, figs. 1-1 b, 2, 2 a, 3, 3 a, 4-7, 
7 a, 8-10. 
Remarks. Compared with specimens from the Coal Measures of 
Indiana our form is slightly smaller, with a narrower and more distinct 
median fold, separated from the rest of the shell by more distinct furrows. 
In Hall’s type figures the median fold is broad and very indistinctly separ- 
ated from the rest of the shell. This difference between the Minnewanka 
specimens and the typical eastern form and Hall’s type figures is one of 
degree and not of kind. C. madisonensis (Girty), otherwise quite similar, 
has its greatest width medially and thus differs radically. 
Locality and Horizon. Pennsylvanian of North America. In the 
Minnewanka region in the Pennsylvanian of section 1-22 (c). 
Phylum, MOLLUSCA 
ClaSS, PELECYPODA 
Genus, Parallelodon Meek 
Parallelodon obsoletus (Meek) 
1871. Macrodon obsoletus Meek, Rept. Regents Univ., West Va.; Meek, 
1875, Pal. Ohio, vol. 2, p. 334, Pl. 19, fig. 9; Herrick, 1887, Sci. 
Lab. Denison Univ., Bull. 2, p. 31, PL 4, fig. 19; Beede, 1900, 
Univ. Geol. Surv., Kansas, Rept., vol. 6, p. 147, PL 20, fig. 13. 
Locality and Horizon. Pennsylvanian of West Virginia and Ohio to 
Colorado. In the Minnewanka region in the Pennsylvanian of section 
2-12 (r). 
Genus, Conocardium Brown 
Conocar dium indianense Miller ? 
1892. Conocardium indianense Miller, 17th Rept. Geol. Surv., Ind., p. 704, 
PL 20, fig. 10. 
Remarks. Since this species is here represented only by one poorly 
preserved specimen, and since Miller’s species was rather inadequately 
described, the present identification is not made with certainty. It is, 
however, probably not the Conocardium found by Girty in his Colorado 
fauna, 1 since that is compared with C. catastomum — a form with con- 
stricted and not regularly tapering posterior part — and it differs in its 
ornamentation from C. nevadensis of the Devonian of the Eureka district, 2 
which it otherwise resembles in size and outline. 
Locality and Horizon. In the Lower Mississippian of Indiana. In 
the Minnewanka region in the Mississippian of section 2-25 (R). 
1 U.S. Geol. Surv., Prof. Paper 16, p. 310. 
* U.S. Geol. Surv., Mon. 8, p. 177. 
