82 



BULLETIN 64, UNITED STATES NATIONAL MUSEUM. 



Observations. — The figures of Miller and Gurley correspond with 

 Doctor Troost's specimen so closely that except for a slight difference 

 in size they might have been drawn from it. 



Formation and locality. — Brownsport limestone (?) Decatur County, 

 Tennessee; Burlington (?), Sedalia, Missouri. 



The crinoids collected by Troost in Decatur County are from the 

 Brownsport limestone, while this species is recorded by Miller and 

 Gurley from the Burlington. Notwithstanding the great discrepancy 

 in horizon these fossils are too closely similar to be considered dis- 

 tinct species, yet it is unlikely .that a species would persist unchanged 

 from the Brownsport to the Burlington. There is probably an error 

 in the labelling of one or other of the specimens. The manner of 

 preservation of Troost's fossil is precisely like that of other speci- 

 mens from the Brownsport limestone of Decatur County, which would 

 favor Doctor Troost's label as being the correct one; but the point 

 could best be settled by finding other specimens of the species at 

 either locality. 



Cat. No. 39948, U.S.N.M. 



CYATHOCRINUS GLOBOSUS Troost. 



Plate 5, figs. 17, 18. 



Cyathrocrinites globosus Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 1850, 



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

 Cyaihocrinus globosus Wachsmuth and Springer, Rev. Palseocrinoidea, I, 1879, 



p. 148 (catalogue name). — Miller, North Amer. Geol. and Pal., 1889, p. 235. 



The original description by Troost is as follows : 



This and the following species, Zeacrinus depressus, are in the same category with 

 the C. crateriformis [Eupachycrinus boydi]. It differs from the preceding in being 

 more elevated, the costals [basals] being in proportion much larger. The pelvis [base] 

 does not penetrate into the body but is level with the surface of the cup — and the 

 angles of the pelvis [infrabasal plates] being more acute and running partly between 

 the costals [basals] gives it the form of a star, which is perforated by a pentagonal 

 aperture. 



It occurs in Decatur County, Tennessee. 



Observations. — The specimen representing this species is missing 

 and Troost's description and figures are published without change. 



Formation and locality. — Brownsport limestone. Decatur County, 

 Tennessee. 



CYATHOCRINUS (?) MUNICIPALIS (Troost). 



Plate 11, fig. 5. 



Poteriocrinites municipalis Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 



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

 Poteriocrinus municipalis Shumard, Trans. Acad. Sci. St. Louis, II, No. 2, 1866, 



p. 392 (catalogue name). — Wachsmuth and Springer, Rev. Palseocrinoidea, 



I, 1879, p. 152 (catalogue name). — Miller, North Amer. Geol. and Pal., 



1889, p. 274 (catalogue name). 



The original description by Troost is as follows : 



It differs only from the Poteriocrinites nobilis, represented in Phillips (Geol. of 

 Yorkshire Pt. 2, pi. 3 ; fig. 40) in the subdivision of the fingers, 



