84 



BULLETIN 64, UNITED STATES NATIONAL MUSEUM. 



Formation and locality. — Kichmond group. The exact locality of 

 this specimen is not known, but precisely similar specimens are found 

 in the Richmond formation of Ohio and Indiana. 



Cat. No. 39950, U.S.N.M. 



Family BOTRYOCRINIME. 

 Genus BARYCRINUS Wachsmuth. 



BARYCRINUS STELLATUS (Hall). 



Plate 8, figs. 6, 7, 8. 



Cyathocrinites stellatus Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 1850 



(nomen nudum); MSS., 1850. 

 Cyathocrinus stellatus Hall, Rep. Geol. Surv. Iowa, I, Pt. 2, 1858, p. 623, pi. xvi, 



figs. 3, 8.— Shumard, Trans. Acad. Sci. St. Louis, II, No. 2, 1866, p. 364 



(catalogue name). 



Cyathocrinus quinquelobus Meek and Worthen, Proc. Acad. Nat. Sci. Phila., 

 1865, p. 150; Geol. Surv. Illinois, III, 1868, p. 519, pi. xx, fig. 6a, 6. 



Barycrinus stellatus Wachsmuth and Springer Rev. Palseocrinoidea, I, 1879, p. 

 103 (catalogue name). — Keyes, Missouri Geol. Surv., IV, 1894, p. 210. — Wel- 

 ler, Bull. No. 153, U. S. Geol. Surv., 1898, p. 122 (catalogue name). 



The original description by Troost is as follows : 



The cup is basin-shape. The pelvis, near the base, is beautifully carved with a 

 figure composed of a double undulated circle twisted in such a manner as to give it 

 the resemblance of a rose, in the centre of which the eolumn is inserted. The five 

 sides of this pelvis [infrabasals] support five tumid almost acute conical costals [basals] 

 giving it the form of a star — this star forms the base of the cup. In the re-entering 

 angles of it are placed five subpentagonal tumid scapulars [radials] and one inter- 

 scapular [anal plate]. The scapulars [radials] have a broad sloping superior surface 

 which supports the arms. It occurs in Stewart County, Tennessee. 



Observations. — Hall's specimen, which must now serve as the type 

 of the species, is not so well preserved as that of Troost, and the latter 

 should have been used as the type, since it is the specimen first de- 

 scribed under the name of stellatus. 



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

 tion. Stewart County, Tennessee; Warsaw, Illinois; Boonville, 

 Curry ville, Pike County, Missouri. 



Cat. No. 39942, U.S.N.M. 



BARYCRINUS PENTASPHERICUS (Troost). 



Plate 5, figs. 7, 8. 

 Cyathocrinites pentasphericus Troost, MSS., 1850. 

 The original description by Troost is as follows : 



It is a basin-shaped, transversely pentagonal cup. Pelvis [infrabasal plates] — 

 nearly entirely taken up by the circular impression of the column. The costals 

 [basals] have a pentagonal contour, but exhibit externally five hemispherical projec- 

 tions between which are placed five hemispherical scapulars [radials], truncated in 

 such manner as to show five circular planes, having a furrow running inwardly from its 

 [each] superior margin; upon this circular plane were attached five arms. 



