150 Trans. Acad, Sci. of St. Louis 
Pentremites cavus ULRICH. 
1905, i Geological Survey Prof. Paper No. 36, p. 57, pl. 
6, figs. 
sitet - Son limestone; Princeton, Kentucky. 
Pentremites cavus Utricu, Butts. 
1917, Kentucky Geological Survey, eo Formations of 
estern Kentucky, p. 45, pl. 10, figs. 18-19. 
St. Louis limestone; Princeton, act 
Pentremites cervinus Hatt. 
1858, Report on the Geological Survey of Iowa, vol. 1, pt. 2, 
pp. 690-691, pl. 25, fig. 11 a-b. 
~— Kaskaskia limestone; Chester, Illinois; Huntsville, Ala- 
ama. 
Pentremites clavatus HAMBACH. 
1886, Transactions, St. Louis Academy of Science, vol. 4, p. 157, 
, By ie. = 
Koka limestone; Evansville, Illinois. 
Pentremites cherokeeus Troost. 
1850, ae acer American Assoc. for the Advancement of 
Science, vol. 2, p 
Pentremites cherokeeus HALL. 
1858, Report on the Geological Survey of Iowa, vol. 1, pt. 2, 
pp. 691-692, pl. 25, figs. 12 a-b. 
Miss. Kaskaskia limestone; Chester, Illinois; Prairie du Long, 
Illinois; Huntsville, Alabama; Cherokee County, Tennessee. 
Pentremites cherokeeus Troost, RowLEy. 
1903, Contributions to Indiana Paleontology, vol. 1, pt. 12, pp. 
116-117, pl. 36, fig. 6. 
Kaskaskia limestone; Clifty Station, Hardin County, Tennessee. 
Pentremites cherokeeus Hatt, WELLER. 
1920, Illinois State Geological Survey, Bull. 41, pp. 371-372, pl. 
10, figs. 11-13. 
Menard limestone; Randolph and Johnson Counties, I}linois. 
Pentremites chesterensis HAMBACH. 
1886, Transactions, St. Louis Academy of Science, vol. 4, pp- 
158-159, pl. B., fig. 8. 
Kaskaskia limestone; Chester, Randolph County, Illinois. 
