100 



BULLETIN 64, UNITED STATES NATIONAL MUSEUM. 



Troost is correct in his observation, the basal plates being distinctly 

 visible beyond the column. 



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

 tion. White's Creek Springs, Tennessee. 



Gat. No. 54236, U.S.N.M. 



Genus CLEIOCRINUS Billings. 



Campanulites Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 1850, p. 60 

 (nomen nudum); MSS., 1850. — Shumard, Trans. Acad. Sci. St. Louis, II, 

 No. 2, 1866, p. 356 (catalogue name). — Miller, North Amer. Geol. and Pal., 

 1889, p. 230 (catalogue name). — Bather, A Treatise on Zoology, III, The 

 Echinoderma, 1900, p. 202 (catalogue name). 



Cleiocrinus Billings, Rep. Progr. Geol. Surv. Canada, 1857, p. 276.— Shumard, 

 Trans. Acad. Sci. St. Louis, II, No. 2, 1866, p. 359 (catalogue name). — Zittel, 

 Handb. d. Pal., I, 1879, p. 357. — Wachsmuth and Springer, Rev. Palseo- 

 crinoidea, I, 1879, p. 35; III, 1886, p. 152. — Miller, North Amer. Geol. and 

 Pal., 1889, p. 231. — Bather, A Treatise on Zoology, III, The Echinoderma, 

 1900, p. 191.— Springer, Mem. Mus. Comp. Zool., XXV, No. 2, 1905, p. 93. 



Doctor Troost's description of Campanulites is as follows: 



Body bell shaped or inverted conical, composed of polygonal plates. 

 Superstructure unknown. 



Supported by a column composed of joints like the crinoids with a circular (?) 

 alimentary canal [lumen]. 



Observations. — This meager description is supplemented by the 

 detailed description of the species which was, no doubt, intended by 

 the author to serve in partial definition of the genus. Cleiocrinus 

 has since been fully defined in Mr. Springer's admirable monograph 

 cited above. 



CLEIOCRINUS TESSELLATUS (Troost). 



Plate 7, fig. 11. 



Campanulites tessellatus Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 1850, 

 p. 60 (nomen nudum); MSS., 1850.— Shumard, Trans. Acad. Sci. St. Louis, 

 II, No. 2, 1866, p. 356 (catalogue name). — Miller, North Amer. Geol. and 

 Pal., 1889, p. 230 (catalogue name). 



The original description by Troost is as follows : 



This fossil resembles more or less the figure of the Echinosphxrites tessellatus, as 

 represented by Deverneuil (see Russia vol. II, plate 27, fig. 7). I am not acquainted 

 with the E. tessellatus, all my knowledge of it, is derived from the above mentioned 

 work, from which it seems that the Echinosphxrites are not supported by a column. 

 Our fossil therefore must belong to a different genus, to which I have applied the name 

 of Campanulites. Though our specimen is much mutilated, particularly near the base, 

 it shows nevertheless that it was affixed to a stem with an alimentary canal [lumen], 

 two entrochi being still attached to the body. I was not able to ascertain the con- 

 struction of the base or pelvic plates it projecting only half above the limestone and 

 this part principally is mutilated, while the other half of the fossil is entirely imbedded 

 in it, and the fossil itself being carbonate of lime, I had no means to separate it from 

 its matrix. 



The plates of which the body is composed are polygons of various forms mostly com- 

 pressed hexagonal. In proportion as the body increases in length, its diameter 



