WITH LIST OF SPECIMENS. 
69 
(Troost): R. Etheridge fil. & P. H. Carpenter, 1886, Cat. Blastoidea 
Brit. Mns. p. 194, Text-fig. vii, pi. xii, ff. 11, 12, pi. xvii, f. 17. 
Troostocrinus reinwardti (G. Troost) : R. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mns. pp. 36,194, pi. xii, f. 11. Silurian, 
Niagara Group: Decatur Co., W. Tennessee, TJ.S.A. [E. 8094.] 
A theca. 
Troostocrinus reinwardti (G. Troost) : R. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 93, 194, pi. xii, f. 12 : Silurian, 
Niagara Group: Decatur Co., W. Tennessee, U.S.A. [E. 8095.] 
A theca. 
Troostocrinus reinwardti (G. Troost) : R. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 94,194, pi. xvii, f. 17: Silurian, 
Niagara Group: Decatur Co., W. Tennessee, tJ.S.A. [E. 8096.] 
A micro-section and the theca from which it was cut. 
-. Silurian, Niagara Group : Decatur Co., W. Tennessee, TJ.S.A. 
[E. 825.] A theca. 
Troostocrinus subcylindricus (Hall & Worthen) : S. A. Miller, 
1889 : v. Metablastus ? subcylindricus. 
Troostocrinus subtruncatus (J. Hall) : R. Etheridge fil. & P. H. 
Carpenter, 1882 : v. Codaster ? subtruncatus. 
Troostocrinus wacksmuthi, W. F. E. Gurley, 1884 : v. Meta¬ 
blastus wacksmuthi. 
Troostocrinus ? woodmani, E. B. Meek & A. H. Worthen, 1868 : 
y. Tricoelocrinus woodmani. 
Troostocrinus wortkeni (J. Hall): B. E. Shumard, 1866: v. Meta¬ 
blastus wortkeni. 
ZYGOCRIBIUS. Astracrinites, T. & T. Austin, 1842, Ann. Mag. 
Nat. Hist. (1) x, p. 110 (nom. nud.). Astrocrinites , T. & T. Austin, 
March 1843, Ann. Mag. Nat. Hist. (1) xi, p. 206. Zygocrinus , H. G. 
Bronn, 1848, Index Pal., Nomenclator, p. 1381. Zygocrinus , C. E. 
Roemer, 1851, Arch. Naturges. xvii (i), p. 390. Astrocrinus, emend., 
R. Etheridge fil. & P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. 
p. 297. Type-species— Z. tetragonus. 
Zygocrinus benniei. Astrocrinites benniei, R. Etheridge fil., 1876, 
Quart. Journ. Geol. Soc. xxxii, p. 103. Astrocrinus benniei , R. Etheridge 
fil.: R. Etheridge fil. & P. H. Carpenter, 1883, Ann. Mag. Nat. Hist. 
(5) xi, p. 237; and 1886, Cat. Blastoidea Brit. Mus. p. 301, pi. xix, 
f. 1, pi. xx, ff. 3-20. 
-. Lower Carboniferous, Carboniferous Limestone, Shale over No. 2 
Limestone : E. Salton, Haddingtonshire, Scotland. 
|~E. 667.] Presented by P. H. Carpenter. Ten specimens. 
[E. 1113.] Presented by J. Bennie. Eight specimens. 
