174 Trans. Acad, Sci. of St. Louis 
Pentremites symmetricus Hatt. 
1858, Report on ni Geological Survey of Iowa, vol. 1, pt. 2, p. 
694, pl. 25, fig. 1 
Kaskaskia nana Kentucky. 
Pentremites symmetricus Hai, ULricu. 
1917, Kentucky Geological eda Formations of the Chester 
Series, p. 260, pl. 7, figs. 8-1 
Paint Creek formation; Nera and Monroe Counties, Ili- 
nois. 
Pentremites symmetricus Hatt, CLARK. 
1917, Bulletin, Museum of Comparative Zoology, vol. 61, No. 9, 
p. 371 (mentioned, not figured). 
Carboniferous; Old Baldy, near Virginia City, Montana. 
Pentremites symmetricus Hatt, WELLER. 
1920, seein resess Geological Survey, Bull. 41, pp. 324-325, pl. 
4, figs. 2 
Renault = Paint Creek limestones; St. Clair and Monroe 
Counties, Illinois. 
Pentremites tennesseeae TROOsT. 
1850, sain ig aera Association for the Advancement 
of Science, vol. 2 
Pentremites truncata CoNnrRApD. 
1843, Proceedings, Academy of Natural Science, Philadelphia, p 
3 
Edwardsville, Madison County, Illinois. 
Pentremites tulipaeformis HAMBACH. 
1903, Transactions, St. Louis Academy of Science, vol. 13, p. 52, 
pl. 4, figs. 10-11. 
Chester group; Kaskaskia, IIlinois. 
Pentremites tulipaeformis Hamsacn, Butts. 
1917, pom coe enh, oo Formations of 
Western Kentucky, p. 100, pl. 2 
Glen Dean spies secant cae 
Pentremites turbinatus HamsBacu. 
1903, Transactions, St. Louis Academy of Science, vol. 13, p. 54, 
pl. 5, fig. 6 
Chester limestone; Evansville, Illinois. 
