WITH LIST OF SPECIMENS. 
41 
Pentremites calycinus, S. S. Lyon, 1860, Trans. Acad. Sci. St. Louis, 
i, p. 628, pi. xx, ff. 1 a-c (see under Pentremites elegans ?, E. 8159 & 
E. 8160). 
Pentremites campanulatns, E. McCoy, 1849 : v. Orbitremites 
camp amalatus. 
Pentremites carioides, D. D. Owen, 1843, Cat. Geol. Spec. Ohio 
Yalley ,ficle B. E. Shuraard, 1866, Trans. Acad. Sci. St. Louis, ii, p. 369, 
who made it syn. of Elceacrinus [ = Nucleocrinus] verneuili. 
Pentremites caryopbyllatus, L. G. de Koninck & H. Le Hon, 1854: 
v. Phsenosehisma caryophyllatnm. 
Pentremites cervinus, J. Hall, 1858, Hep. Geol. Surv. Iowa, i (2), 
p. 690, pi. xxv, ff. 11 a, b. Pentremites c.ervinus, Hall: B. Etheridge 
fil. & P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. p. 166. 
Pentremites cherokens, nom. nud., G. Troost, 1850, Proc. Amer. 
Assoc. 1849, p. 60. Considered a syn. of P. sulcatus , Boemer: J. Hall, 
1858, Bep. Geol. Surv. Iowa, i (2), p. 691, pi. xxv, ff. 12 a, b ; and B. E. 
Shumard, 1866, Trans. Acad. Sci. St. Louis, ii, p. 385 ; but correctness of 
this identification doubted by B. Etheridge fil. & P. H. Carpenter, 1886, 
Cat. Blastoidea Brit. Mus. p. 166. 
Pentremites chesterensis. Pentremites Chesteriensis, G. Hambach, 
1880, Trans. Acad. Sci. St. Louis, iv, p. 158, pi. B, f. 8. Pentremites 
chesteriensis, Hambach : B. Etheridge fil. & P. H. Carpenter, 1886, Cat. 
Blastoidea Brit. Mus. p. 144. 
Pentremites clavatus, G. Hambach, 1880, Trans. Acad. Sci. St. Louis, 
iv, p. 157, pi. B, f. 5 (non Schultze, 1867). Troostocrinus ? clavatus 
(Hambach): B. Etheridge fil. & P. H. Carpenter, 1882, Ann. Mag. 
Hat. Hist. (5) ix, p. 249. Pentremites clavatus , Hambach : B. Etheridge 
fil. & P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. p. 199. 
Pentremites clavatus, L. Schultze, 1867: v. Pentremitidea 
clavata. 
Pentremites conoideus, J. Hall, 1856, Trans. Albany Inst, iv, p. 5 ; 
and 1858, Bep. Geol. Surv. Iowa, i (2), p. 655, pi. xxii, ff. 8-10. Pentre¬ 
mites koninckana , J. Hall, 1856, Trans. Albany Inst, iv, p. 4; and 1858, 
Bep. Geol. Surv. Iowa, i (2), p. 656, pi. xxii, ff. 11 a-c. Pentremites 
sulcatus , K. A. Zittel (non Boemer), 1879, Handb. d. Palseont. i, p.432, 
f. 305 a. Pentremites conoideus , Hall (including P. koninckana ) : 
B. P. Whitfield, 1882, Bull. Amer. Mus. Hat. Hist, i (3), p. 44. 
Pentremites conoideus and var. koninckanus , Hall: B. Etheridge fil. 
& P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. p. 162. 
Pentremites conoideus , Hall: B. Etheridge fil. & P. H. Carpenter, 1886, 
Cat. Blastoidea Brit. Mus. pp. 46, 162, pi. xviii, f. 6. Lower 
