86 



BULLETIN 64, UNITED STATES NATIONAL MUSEUM. 



BARYCRINUS EXPANSUS Miller and Gurley. 



Barycrinus expansus Miller and Gurley, Bull. No. 5, Illinois State Mus. Nat. 

 Hist., 1894, p. 41, pi. iv, fig. 2.— Weller, Bull. No. 153, U. S. Geol Surv., 

 1898, p. 119 (catalogue name). 



An unlabeled specimen in the Troost collection is evidently of this 

 species. It shows the upper part of the calyx and two arm bases only. 



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

 tion. White's Creek Springs, Tennessee. 



Cat. No. 39978, U.S.N.M. 



Family SCAPHIOCRINID^ Bather. 

 Genus SC APH IOCRINUS Hail. 



SCAPHIOCRINUS HUNTSVILL^E Worthen. 



Plate 6, fig. 11. 



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

 p. 61 (nomen nudum); MSS., 1850. 



Scaphiocrinus huntsvillse Worthen, Geol. Surv. Illinois, V, 1873, p. 534, pi. xx, 

 fig. 1. — Wachsmuth and Springer, Rev. Palseocrinoidea, I, 1879, p. 113 

 (catalogue name). — Miller, North Amer. Geol. and Pal., 1889, p. 280 (cata- 

 logue name).— Weller, Bull. No. 153, U. S. Geol. Surv., 1898, p. 544 (cata- 

 logue name). 



Cyathocrinus roemeri Wachsmuth and Springer, Rev. Palseocrinoidea, I, 1879, 

 p. 149 (catalogue name). — Miller, North Amer. Geol. and Pal., 1889, p. 236 

 (catalogue name). 



The following description is by Troost : 



The characters of this delicate crinoid, for the greatest part imbedded in compact 

 limestone, can not be easily ascertained, the joints of the plates being mostly oblit- 

 erated when disengaged from its surrounding limestone. In fact those that I dis- 

 covered in the State of Tennessee were too imperfect to show its construction, and I 

 owe to the kindness of Dr. Newman, of Huntsville, Alabama, the one which has served 

 for my description, even in this, the joints of the plates forming the cup are not very 

 plain. • 



The cup is inverted conical, small and supported by a slender cylindrical column 

 composed of alternating small and large joints with rounded margins. The five arm 

 joints form the superior rim of the cup, from which proceed ten tentaculated hands, 

 which after ascending six or seven [nine or ten] joints receives a cuneiform joint where 

 they are subdivided into four tentaculated fingers. 



Occurs in Maury County, Tennessee, near Duck River, and in the vicinity of Hunts- 

 ville, Alabama, both Carboniferous limstone. 



Observations. — The difference between Troost's specimen and that 

 described by Worthen is chiefly one of size. The similarity in the 

 arrangement of the calyx plates, so far as these are preserved, the 

 mode of branching of the arms and the cuneiform arm plates have 

 led to placing them in the same species. 



The arms of Doctor Troost's specimen are broader near the base 

 and the dorsal cup larger than shown in his figure. 



