228 
Kirtley F. Mather 
1877. Aviculopecten occidentalis. White, U. S. Geog. Surv. west of 100th 
Merid., vol. 4, p. 146, pi. 12, figs. Sa-b. 
Carboniferous: Camp Apache, Arizona. 
1884. Aviculopecten occidentalis. White, 13th Rep. Geol. Surv. Ind., p. 
143, pi. 28, fig. 2. 
Coal Measures: Pike and Gibson Counties, Indiana. 
1886. Aviculopecten occidentalis. Heilprin, 2nd Geol. Surv. Penn., Ann. 
Rep. for 1885, p. 455, fig. 5a; p. 442, fig. 5. 
Mill Creek limestone, Upper Coal Measures: Wilkesbarre, Penn- 
sylvania. 
1886. Aviculopecten occidentalis. Heilprin, Proc. and Coll. Wyo. Hist, and 
Geol. Soc., vol. 2, pt. 2, p. 270, fig. 5; p. 271, fig. 5a. 
Mill Creek limestone. Upper Coal Measures: Wilkesbarre, Penn- 
sylvania. 
1891. Aviculopecten occidentalis. White, Bull. U. S. Geol. Surv., No. 77, 
p. 29, pi. 4, fig. 1. 
Permian: Military Crossing, Baylor County, Texas. 
1894. Aviculopecten occidentalis. Keyes, Mo. Geol. Surv., vol. 5, p. 110, 
pi. 42, fig. 3. 
Upper Coal Measures: Plattsburg, and Kansas City, Missouri. 
1897. Aviculopecten occidentalis. Smith, Proc. Am. Phil. Soc., vol. 35, 
p. 34. 
Lower Coal Measures: Conway County, Arkansas. 
1899. Aviculopecten occidentalis. Girty, 19th Ann. Rep. U. S. Geol. Surv., 
pt. 3, p. 578. 
Upper Coal Measures: McAlester and Atoka quadrangles, Indian 
Territory. 
1900. Aviculopecten occidentalis. Beede, Univ. Geol. Surv. Kans., vol. 6, 
p. 114, pi. 13, fig. 7. 
Upper Coal Measures: Turner, Eudora, Lawrence, Topeka, and 
Wabaunsee County, Kansas. 
1902. Aviculopecten occidentalis. Beede, Adv. Bull, of 1st Bienn. Rep. 
Geol. Surv. Okla., p. 9, pi. 1, fig. 5. 
Red Beds: White Horse Springs, Oklahoma. 
1903. Aviculopecten occidentalis. Girty, Prof. Paper, U. S. Geol. Surv., 
No. 16, p. 414, pi. 8, fig. 1. 
Middle portion of Hermosa formation: San Juan region, Colorado. 
Rico formation: San Juan region, Colorado. 
Maroon formation: Crested Butte district, Colorado. 
1909. Deltopecten occidentalis. Girty, Bull. U. S. Geol Surv., No. 389, 
p. 84. 
Manzano group, Abo sandstone: Abo Canyon, New Mexico. 
1911. Aviculopecten occidentalis. Mark, Bull. Sci. Lab. Den. Univ., vol. 
16, p. 312, pi. 10, fig. 2. 
Mercer limestone: Bald Knob, Ohio. 
