WITH LIST OF SPECIMENS. 
43 
Pentremites conoideus, J. Hall, yar. koninckanus, J. Hall: 
R. Etheridge fil. & P. H. Carpenter, 1886 : y. Pentremites 
conoideus. 
Pentremites cornutus, E. B. Meek & A. H. Worthen, 1860: v. 
Heteroblastus ? cornutus. 
Pentremites crenulatus (C. E. Roemer) : L. G. de Koninek & 
H. Le Hon, 1854 : v. Mesoblastus crenulatus. 
Pentremites curtus ? B. E. Shumard, 1855 : v. Orbitremites ?' 
curtus. 
Pentremites ? decussatus. Pentremites decussatus , B. E. Shumard, 
1858, Trans. Acad. Sci. St. Louis, i, p. 242, pi. ix, ff. 6 a,b ; and 
1866, op. eit. ii, p. 383. “ Genus indet.”: R. Etheridge fil. & P. H. 
Carpenter, 1886, Cat. Blastoidea Brit. Mus. p. ]43. 
Pentremites derbiensis, G. B. Sowerby, 1825 : v. Orbitremites 
derbiensis. 
Pentremites dntertrii 5 errore pro Pentremites paillettei, C. E. Roemer, 
1851 : y. Pentremitidea paillettei. 
Pentremites eifeliensis, C. E. Roemer : L. Schultze, 1867: v.- 
Pentremitidea eifelensis. 
Pentremites eifeliensis (pars), L. Schultze, 1867 (non Roemer): y. 
Pentremitidea roemeri. 
Pentremites elegans, S. S. Lyon, 1860, Trans. Acad. Sci. St. Louis* 
i, p. 632, pi. xx, ff. 4 a-c. Pentremites elegans , Lyon : R. Etheridge fil. 
& P. H. Carpenter, 1886, Cat. Blastoidea Brit. Mus. p. 156, & ? pi. y* 
f. 27. 
Pentremites pyriformis , T. Say: R. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 60, 167, pi. i, f. 3. Lower 
Carboniferous, Chester Group : Alabama, TJ.S. A. [75972.] A theca. 
Pentremites pyriformis , T. Say : R. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 12, 168, pi. ii, f. 26. Lower 
Carboniferous, Chester Group: (? Huntsville, Alabama) TJ.S. A. 
[E. 8106.] A theca, handed over by the authors as the figured 
specimen. 
Pentremites pyriformis , T. Say : R. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 12, 168, pi. ii, f. 27. Lower 
Carboniferous, Chester Group : (? Huntsville, Alabama) TJ.S.A. 
[E. 8107.] A theca, handed over by the authors as the figured 
specimen. 
Pentremites pyriformis , T. Say: R. Etheridge fil. & P. H. Carpenter, 
1886, Cat. Blastoidea Brit. Mus. pp. 12, 168, pi. ii, f. 29. Lower 
Carboniferous, Chester Group : (? Huntsville, Alabama) TJ.S.A. 
