166 
Kirtley F. Mather 
1872. Productus pertenuis. Meek, U. S. Geol. Surv, Nebr., p. 164, pi. 1, 
figs. 14a-c; pi. 8, figs. 9a-d. 
Upper Coal Measures: Nebraska City and Brownsville, Nebraska; 
Grasshopper Creek, 12 miles west of Leavenworth and at Atchi- 
son, Kansas. 
1898. Productus pertenuis. Drake, Proc. Am. Phil. Soc., vol. 36, p. 404, 
pi. 9, figs. 8-10. 
Lower Coal Measures: 4 miles north of Vinita, and 1 mile south 
of Muscogee, Indian Territory. 
Upper Coal Measures, Cavaniol group: McClellan Ford on Verdi- 
gris River, Indian Territory. 
Poteau group: 6 miles west of South Canadian, Indian Territory. 
Pawhuska sandstone: 5 miles west of Cushing, Indian Territory. 
Boston group: 5 miles southeast of Adair, Indian Territory. 
1900. Productus pertenuis. Beede, Univ. Geol. Surv. Kans., vol. 6, p, 83, 
pi. 9, figs. 5-5c. 
Upper Coal Measures: Kansas City, Eudora, Lawrence, Lecomp- 
ton, and Topeka, Kansas. 
1903. Productus pertenuis ?. Girty, Prof. Paper, U. S. Geol. Surv., No. 
16, p. 367. 
Middle portion of Hermosa formation: San Juan region, Colorado. 
A number of shells in the Morrow collections appear to be 
conspecific with Meek^s specimens. They are all small, the 
dimensions of two average individuals being : length from hinge- 
line to anterior margin, 5.9 mm., 6.4 mm. ; distance from umbonal 
region to anterior margin, 7.2 mm., 7.4 mm. ; length of hinge- 
line, 9.0 mm., 9.6 mm. ; convexity of pedicle valve, ■ — 3.0 mm., 
— -3.0 mm. The concentric ribs are more conspicuous than the 
radiating costae and the agreement with the figures and descrip- 
tions of the type is very close. 
It is probable that Drake’s figures, cited above, represent a 
form which should not be entered in the synonymy of this 
species. The specimen figured is not from the Morrow group, 
as might be inferred from the statement of its locality and 
horizon, as it is now known that the strata outcropping 5 miles 
southeast of Adair, Oklahoma, are a part of the Fayetteville shale. 
Horizon and locality. Hale formation: East Mountain, Fay- 
etteville, Arkansas (Station 136). Brentwood limestone: near 
Fayetteville, Arkansas (Stations 134 and 135) ; Sawney Hollow, 
Oklahoma (Station 210). Kessler limestone: East Mountain, 
Fayetteville, Arkansas (Station 209). Morrow formation: near 
Ft. Gibson (Stations 296 and 303), and Gore (Station 304), 
Oklahoma. 
