TEOOST'S CRINOIDS OF TENNESSEE — E. WOOD. 21 



ORBITREMITES GRANULATUS (Roemer.) 



Plate 4, figs. 12, 13, 14, 15, 16, 17. 



Granatocrinites cidariformis Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 



1850, p. 62 (nomen nudum); MSS. 1850. 

 Granatocrinites globosus Troost, MSS. 1850. 



Pentatrematites granulatus Roemer, Arch. Naturg., XVII, (1), 1851, pp. 363, 364. 



Granatocrinus granulatus Hall, 15th Rep. N. Y. State Cab. Nat. Hist., 1862, 

 p. 146. — Shumard, Trans. Acad. Sci. St. Louis, II, 1866, p. 375 (catalogue 

 name). — Etheridge and Carpenter, Cat. Blastoidea, 1886, p. 244. — Miller, 

 North Amer. Geol. and Pal., 1889, p. 250 (catalogue name). — Weller, Bull. 

 No. 153, IT. S. Geol. Survey, 1898, p. 299 (catalogue name). 



Orbitremites? granulatus Bather, List Blastoidea Brit. Mus. (Nat. Hist.), 1899, 

 p. 29. 



Cidaroblastus granulatus Hambach, Trans. Acad. Sci. St. Louis, XIII, 1903, 

 pp. 27-32, 45. 



The following is the original description of Granatocrinites cidar- 

 iformis by Troost: 



Globular, slightly elongated. 



Pelvis [base] more or less stellated or pentagonal, composed of small plates, forming 

 a small concave dome without any marks of insertion of a column [?] or of an appear- 

 ance of an alimentary aperture [lumen]. 



The five plates which surround the pelvis are elongated, sub-pentagonal approach- 

 ing in form similar plates in the Pentremites, their superior margin being circular 

 and having a longitudinal incision which terminates near the base, where they form 

 the margin of the pelvic cavity, and thence rising they enclose partly the double 

 rows of pores which descend from the summit and terminate near the lower margin. 



These five plates combined form a cup with five circular elevations at the rim, in 

 the re-entering angles of which are placed five isosceles triangular plates being beveled 

 at the base so as to fit the rounded margin of the inferior plates. 



Five double rows of pores proceed from the very summit, running along the tri- 

 angular plates above mentioned, and entering into the incision of lower series of plates 

 first mentioned, terminate near the lower margin of them. 



The whole surface is granulated — these grains have a tendency to run parallel to the 

 sides of the plates. 



No ovary or oral aperture, is visible on the surface; they may nevertheless have 

 existed in the live state, and have been obliterated during fossilification, because 

 judging from siliceous internal casts of the same, I think I perceive traces of such 

 apertures. 



They occur near Shelby vi lie, Bedford County, Devonian [Tullahoma formation] — ■ 

 and in Allen County, Kentucky. 



The following is the original description of Granatocrinites globosus 

 by Troost: 



It differs from G. cidariformis in being globular, having at the base a circular cavity, 

 the junction of the lower series of plates with those of the superior being curvilinear, 

 and its surface being very irregularly granulated, whereas the 0. cidariformis is oval, 

 has a pentagonal basal cavity, the junction of the above mentioned place is rectilinear 

 and its surface regularly granulated. 



Bedford County, Tennessee. 



Observations. — Doctor Hambach regards Granatocrinites globosus 

 Troost as a synonym of G. cidariformis. In reference to Troost's 



