54 
THE SPECIES OF BLASTOIDEA 
Pentremites subcylindricus, J. Hall & E. P. Whitfield, 1875 r 
v. Metablastus ? subcylindricus. 
Pentremites subtruncatus, J. Hall, 1858 : v. Codaster ? subtrun- 
catus. 
Pentremites sulcatus. Pentatrematites sulcatus, C. F. Eoemer, 1851, 
Arch. Haturges. xvii (i), p. 354, pi. vi, ff. 10 ci-c. Pentremites sulcatus , 
Eoemer: E. F. Shumard, 1886, Trans. Acad. Sci. St. Louis, ii, p. 385. 
Said by J. Hall & B. F. Shumard to include Pentremites cheroleeus (q. v.). 
Pentremites sulcatus , Eoemer: E. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. p. 165. Perhaps includes Pentremites 
missouriensis, Swallow (q. v.). 
Pentremites sulcatus, C. F. Eoemer: E. Etheridge fil. & P. H. Carpenter,. 
1886, Cat. Blastoidea Brit. Mus. pp. 61, 101, 165, pi. i, ff. 9, 10. 
Lower Carboniferous, Chester Group : Chester, Illinois, U.S.A. [E., 
8098.] A theca. 
Pentremites sulcatus, C. F. Eoemer : E. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 41, 94,165, pi. xvi, f. 20, & 
pi. xviii, f. 5. Lower Carboniferous, Chester Group : Illinois, U.S.A. 
[E. 8099.] Micro-section, and the two halves of the theca from 
which it was cut. 
-. Lower Carboniferous, Chester Group : Chester, Illinois, U.S.A. 
[E. 757.] A large theca, and a rather weathered theca. 
[E. 8155.] T. A. Worthen Coll. A very perfect theca. 
[E. 8158.] T. A. Worthen Coll. Two well-preserved thecas, one 
rather crushed. 
-. Lower Carboniferous, Chester Group: Franklin Co., Tennessee, 
U.S.A. [E. 8144.] T. A. Worthen Coll. A perfect theca, with 
peristomial covering-plates. 
-. Lower Carboniferous, Chester Group : Evansville, Illinois,. 
U.S.A. [E. 8156.] T. A. Worthen Coll. Three thecas. 
Pentremites sulcatus* K. A. Zittel, 1879, Handb. d. Palaeont. i, 
p. 432, f. 305 a (non Eoemer): v. Pentremites conoideus. 
Pentremites symmetrieus, J. Hall, 1858 : v. Pentremites piri¬ 
formis and var. symmetrieus. 
Pentremites tennessese* G. Troost, nom. nud., 1849, Amer. Journ. 
Sci. (2) viii, p. 419; and 1850, Proc. Amer. Assoc. Adv. Sci. for 1849, 
p. 60. Quoted by B. F. Shumard, 1866, Trans. Acad. Sci. St. Louis, 
ii, p. 386; and by E. Etheridge fil. & P. H. Carpenter, 1886, Cat. 
Blastoidea Brit. Mus. p. 145. 
Pentremites troosti. Pentremites globosus, G. Troost MS., quoted by 
J. Hall, 1858, Eep. Geol. Surv. Iowa, i (2) p. 695, pi. xxv, f. 17 (non 
P. globosa, Say). Pentremites troosti, B. F. Shumard, 1866, Trans. Aca 
Sci. St. Louis, ii, p. 386. u Pentremites globosus (Troost), Hall E. Eth 
ridge fil. & P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. p. 144. 
