WITH LIST 0E SPECIMENS. 
53 
Pentremites pyriformis, Say, 1825: v. Pentremites piriformis. 
Pentremites pyriformis, R. Etheridge fil. & P. H. Carpenter, 1886, 
pars (non Say) : v. Pentremites elegans [75972, E. 8106, 
E. 8107, E. 8109]. 
Pentremites reinwardtii, G. Troost, 1835: v. Troostocrinus 
relnwardti. 
Pentremites robustns, S. S. Lyon, 1860, Trans. Acad. Sci. St. Louis, 
i, p. 629, pi. xx, ff. 2 a-c. Pentremites rohustus , Lyon': R. Etheridge 
fil. & P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. p. 156. 
Pentremites robustus, S. S. Lyon : F. A. Bather, 1899, in Lankester’s 
Zoology, Cap. Blastoidea, f. xv, 1. Lower Carboniferous: Chester 
Group : Chester, Illinois, TJ.S.A. [E. 8145.] T. A. Worthen Coll. 
A well-preserved theca. 
-. Lower Carboniferous, Chester Group: Chester, Illinois, U.S.A. 
[E. 8153.] T. A. Worthen Coll. Four slightly weathered thecas. 
[E. 8157.] T. A. Worthen Coll. One large theca. 
-? Lower Carboniferous, Chester Group: Alleghanies, IT.S.A. 
[E. 759.] Presented by J. N. Pearson. A theca. 
Pentremites roemeri, B. F. Shumard, 1855 : v. Qrbitremites ? 
roemeri et Schizoblastus missouriensis. 
Pentremites sampsoni, G. Hambach, 1884: v. Schizoblastus 
sampsoni. 
Pentremites sayi, B. F. Shumard, 1855 : v. Schizoblastus sayi. 
Pentremites schultzii, E. J. A. d’Archiac & P. E. P. de Verneuil, 
1845 : v. Cryptoschisma schulzi. 
Pentremites sirius 9 C. A. White, 1862 : v. Orophocrinus sirius. 
Pentremites spinosns, G. Hambach, 1880, Trans. Acad. Sci. St. Louis, 
iv, p. 154, pi. B, f. 1. Pentremites spinosus , Hambach: R. Etheridge 
fil. & P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. p. 145. 
Pentremites stelliformis 9 H. D. Owen & B. F. Shumard, 1850 : 
v. Orophocrinus stelliformis. 
Pentremites ? strtatns. Pentremites striatus , J. Hall, 1858, Rep. 
Geol. Surv. Iowa, i (2), p. 485 (compared to P. subtrunccitus [=Codaster] 
& P. reinwardti [ = Troostocrinus]). “ [_Pentremites] striatus, Hall, MS./’ 
R. Etheridge fil. & P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. 
p. 138. 
Pentremites snbconoidens, F. B. Meek, 1873, 6th Ann. Rep. U.S. 
Geol. Surv. Territ. for 1872, p. 471, footnote. 
