14 BULLETIN 64, UNITED STATES NATIONAL MUSEUM. 



pi. xxv, fig. 16.— Billings, Geol. Surv. Canada, Dec. IV, 1859, p. 20, figs. 

 5, 7. — Dtjjardin and Hupe, Hist. Nat. Zooph. Ech., 1862, p. 91. — Shumard, 

 Trans. Acad. Sci. St. Louis, II, 1866, p. 385 (catalogue name). — Billings, 

 Amer. Journ. Sci., 3d ser., I, 1870, p. 228. — Wachsmuth and Springer, 

 Proc. Acad. Nat. Sci. Phila., 1879, pi. xvn, fig. 5. — White, 2nd Ann. Rep. 

 Dep. Stat, and Geol. Indiana, 1881, p. 511, pi. i, fig. 9. — Etheridge and 

 Carpenter, Cat. Blastoidea, 1886, p. 167, pi. i, figs. 6, 7; pi. n, figs. 24-30; 

 pi. xn, figs. 13, 15; pi. xvm, fig. 3.— Miller, North Amer. Geol. and Pal., 

 1889, p. 268 (catalogue name). — Keyes, Missouri Geol. Surv., IV, 1894, 

 p. 135.— Harris, Bull. Amer. Pal., I, No. 5, 1896, p. 352.— Weller, Bull. 

 No. 153, IT. S. Geol. Surv., 1898, p. 416 (catalogue name). — Bather, List 

 Blastoidea Brit. Mus. (Nat Hist.), 1899, p. 51 (catalogue name). — Hambach, 

 Trans. Acad. Sci. St. Louis, XIII, 1903, p. 38, pi. in, figs. 8, 9, 15, 16. 



Pentatrematites pyriformis Roemer, Archiv. f. Naturg., Jahrg. XVII, I, 1851, 

 p. 354, pi. v, fig. 9a~c. 



Pentremites subconoideus Meek, U. S. Geol. Surv. Montana, Idaho, Wyoming 

 and Utah, 1873, p. 471. 



The following is the description by Troost : 



Elongated elliptical. 



Ambulacra long, reaching to the middle of the whole body — terminating at the 

 base, acute pentagonal. 



Western declivity of the Cumberland Mountain in an oolitic limestcne. — Sequatchie 

 Valley, Tennessee. Rarely Mount Sano, Alabama, and Springfield, Kentucky. 



Observations.— Doctor Hambach does not mention the specimen 

 which Troost has referred to this species, but according to the figures 

 it appears to be correctly identified. The deltoids are longer than is 

 usual in the species, but this point is not mentioned in the original 

 description, and specimens subsequently referred to the species show 

 great variation in the length of the deltoids. 



Doctor Hambach distinguishes the species from P. Jiorealis as fol- 

 lows : 



This species differs from P. Jiorealis, its nearest relative, in having its greatest diame- 

 ter at the apex of the ambulacrum, dividing the calyx into two equal halves, i. e., 

 the distance from the articulation surface of the column equals the distance from the 

 apex of the ambulacrum to the summit. 



Cat. No. 33073, U.S.N.M. 



PENTREMITES ELEGANS Lyon. 



Plate 2, figs. 10, 11, 12. 



Pentremites tennesseex Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 1850, 

 p. 60 {nomen nudum); MSS. 1850. 



Pentremites elegans Lyon, Trans. Acad. Sci. St. Louis, I, 1858, p. 632, pi. xx, 

 figs. 4a-c. — Shumard, Trans. Acad. Sci. St. Louis, II, 1866, p. 383 (cata- 

 logue name). — Miller, North Amer. Geol. and Pal., 1889, p. 267 (catalogue 

 name). — Whitfield, Ann. N. Y. Acad. Sci., 1891, p. 577, pi. xm, fig. 4; 

 Geol. Surv. Ohio, VII, 1895, p. 466, pi. ix, fig. 4.— Weller, Bull. No. 153, 

 U. S. Geol. Surv., 1898, p. 413 (catalogue name). — Bather, List Blastoidea 

 Brit. Mus. (Nat. Hist.), 1899, p. 43.— Hambach, Trans. Acad. Sci. St. Louis, 

 XIII, 1903, p. 37. 



