ivz Trans. Acad. Sct. of St. Louis 
Pentremites spicatus ULRIcH, WELLER. 
1920, Illinois State Geological Survey Bulletin 41, p. 368, pl. 10, 
fig. 8. 
Upper Okaw limestone; Randolph County, Pope County, IIli- 
nois; Crittenden County, Breckenridge County, Kentucky. 
Pentremites spinosus HAMBACH. 
86, Transactions, St. Louis Academy of Science, vol. 4, pp. 
154-155, pl. B, fig. 1 
Kaskaskia limestone; Chester, Illinois. 
Pentremites springeri ULRICH. 
1917, Kentucky ick pin? ngs Formations of the Chester 
Series, p- 255, pl. 5, figs. 36-40. 
Gasper oolite; New Bethel, Kentucky. 
Pentremites stelliformis Owen and SHUMARD. 
1850, Journal, ae Academy of Natural Science, vol. 2, 
pt. 1, p. 67, pl. 7, figs. 16 a-b. 
Pentremites stelliformis OWEN and SHUMARD. 
1852, Report of a Geological Survey of Wisconsin, Iowa and 
Minnesota by David Dale Owen, Philadelphia, p. 593, pl. V, 
figs. 16 a-b. 
Mississippian, Burlington limestone; Burlington, Iowa. 
Pentremites stelliformis OWEN and SHUMARD, WHITE. 
1863, Journal, Boston Society of Natural History, vol. 3, No. 4, 
p- 486. 
Pentremites subconoideus MEEK. 
1873, Geological Survey of the Territories, 6th Annual Report, 
F. V. Hayden, p. 471 (not figured). 
Carboniferous; divide between Ross Fork and Lincoln Valley, 
Montana 
Pentremites ag var: MEEK, CLARK. 
a Pip ai Museum of Comparative Zoology, cal 61, No. 9, 
0 (me heroes =e figured). 
ROE divide between Ross Fork and Lincoln Valley, 
Montana. 
Pentremites subcylindrica HALL and WHITFIELD. 
1875, Ohio Geological Survey, Paleontology, vol. 2, pp. 129-130, 
, fig. 13. 
Niagara group; Yellow Springs, Ohio. 
