WITH LIST OF SPECIMENS. 
51 
Pentremites pentangularis, “ Gilb.”: J. Phillips, 1836 : v. Oro- 
phocriims pentangularis. 
Pentremites piriformis ?, y. Pentremites godoni, yar. No. 2 
[75963]. 
Pentremites piriformis. Pentremite pyriformis , T. Say, 1825, 
Journ. Acad. Nat. Sci. Philadelphia (1) iv, p. 294; and Zool. Journ. 
ii, p. 314. Pentatrematites pyriformis , Say: C. E. Eoemer, 1851, 
Arch. Haturges. xyii (i), p. 354, pi. v, ff. 9 a-c. Pentremites pyri¬ 
formis , Say : E. Etheridge fil. & P. H. Carpenter, 1886, Cat. Blastoidea 
Erit. Mus. p. 167 ; they include Pentremites symmetricus, J. Hall, 1858, 
Eep. Geol. Sury. Iowa, i (2), p. 694, pi. xxy, f. 14. 
Pentremites pyriformis, T. Say: E. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 60, 167, pi. i, f. 1. Lower 
Carboniferous, Chester Group : Kentucky, U.S.A. [E. 8097.] W. 
Cunnington Coll. A theca. 
Pentremites pyriformis , T. Say: E. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 12, 168, pi. ii, f. 25. Lower 
Carboniferous, Chester Group : (? Huntsville, Alabama) U.S.A. 
[E. 8105.] A. thefca, handed oyer by the authors as the figured 
specimen. 
Pentremites pyriformis, T. Say: E. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 12, 168, pi. ii, f. 28. Lower 
Carboniferous, Chester Group : (? Huntsville, Alabama) U.S.A. 
[E. 8108.] A theca, handed oyer by the authors as the figured 
specimen. 
Pentremites pyriformis , T. Say: E. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 12, 168, pi. ii, f. 30. Lower 
Carboniferous, Chester Group: (? Huntsville, Alabama) U.S.A. 
[E. 8110.] A theca handed oyer by the authors as the figured 
specimen. 
-. Lower Carboniferous, Chester Group : Huntsville, Alabama, 
U.S.A. 
[E. 764.] Two weathered thecas on matrix. 
[E. 766.] A theca. 
-. Lower Carboniferous, Chester Group : Alabama, U.S.A. 
[E. 8129.] Presented by J. H. Pearson. Two thecas, much 
weathered. 
--. Lower Carboniferous, Chester Group : Chester, Illinois, 
U.S.A. 
[E. 765.] C. Wachsmuth Coll. Seven cut and polished thecal 
fragments. 
[E. 8149.] T. A. Worthen Coll. Two thecas of typical form. 
[E. 8185.] T. A. Worthen Coll. Eour-rayed theca, imperfect 
above. 
--. Lower Carboniferous, Chester Group: Alleghanies, U.S.A. 
[E. 768.] Presented by J. F. Pearson. Three thecas on matrix. 
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