TROOST 's CRICOIDS OF TENNESSEE — E. WOOD. 85 



It occurs in a siliceous stratum one mile from Woodbury on the road to MacMinn- 

 ville, Warren County, Tennessee. Devonian — was discovered by Prof. James M. 

 Safford of Lebanon. 



Observations. — Hall [1858, p. 625] has compared this species with 

 his Cyaihocrinus tumidus, from which it differs in the deeper, narrower 

 cup and the larger column. The species differs from Barycrinus sub- 

 tumidus Meek and Worthen in its small size and in having the basals 

 smaller than the radials instead of larger, as in the latter species. 

 The arm facets are also proportionally larger and are nearly vertical 

 in position. 



Barycrinus pentaspliericus bears a close superficial resemblance to 

 Barycrinus geometricus Meek and Worthen, but that species is said to 

 lack the anal plate which is well developed in B. pentasphericus. 

 The column is also proportionally smaller in the former species. 



Formation and locality. — Keokuk horizon of the Tullahoma forma- 

 tion. Locality as given above. 



Cat. No. 39947, U.S.N.M. 



BARYCRINUS HOVEYI (Hall). 



Cyathocrinites corrugatus Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 



1850, p. 60 (nomen nudum); MSS., 1850. 

 Cyaihocrinus hoveyi Hall, Descr. New Species Crin., 1861, p. 5; Journ. Boston 



Soc. Nat. Hist., VII, 1861, p. 293.— Shumard, Trans. Acad. Sci. St. Louis, 



II, 1866, p. 362 (catalogue name). 

 Scaphiocrinus hoveyi Hall, Photo. Plates of Crinoids, 1872, pi. v, fig. 11. 

 Barycrinus hoveyi Meek and Worthen, Geol. Surv. Illinois, V, 1873, p. 486, pi. 



xm, fig. 1. — Wachsmuth and Springer, Rev. Palseocrinoidea, I, 1879, p. 



102 (catalogue Dame). — Miller, North Amer. Geol. and Pal., 1889, p. 226 



(catalogue name). — Keyes, Missouri Geol. Surv., IV, 1894, p. 209. — Weller, 



Bull. No. 153, U. S. Geol. Surv., 1898, p. 120 (catalogue name). 

 Cyaihocrinus corrugatus Wachsmuth and Springer, Rev. Palseocrinoidea, I, 



1879, p. 148 (catalogue name). — Miller, North Amer. Geol. and Pal., 1889, 



p. 235 (catalogue name). 



The description by Troost is as follows : 



It is coarsely wrinkled. The wrinkles proceed in high ridges from the pentagonal 

 pelvis [infrabasal plates], they bifurcate on the costals [basals] and enter on both sides 

 into the scapulars [radials] where they join with the ridge that proceeds from the 

 opposite side, forming in this manner five subrhomboidal, elongated depressions on 

 the surface of the body. The scapulars [radials] are deeply truncated for the recep- 

 tion of arms. The whole was surrounded by a granulated integument which is still 

 partly attached to the body. 



Observations. — Troost's specimen is a young individual of this 

 species of which neither the arms nor column are preserved. 



Formation and locality .—Keokuk horizon of the Tullahoma forma- 

 tion. Harpeth Ridge, Davidson County, Tennessee; Crawfordsville, 

 Indiana; Boonville, Missouri; Keokuk, Iowa. 



Cat. No. 39945, U.S.N.M. 



