TROOST 's CRINOIDS OF TENNESSEE E. WOOD. 



91 



Genus COELIOCRINUS White. 



COELIOCRINUS CARINIFEROUS (Worthen). 



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



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

 Zeacrinus cariniferous Worthen, Geol. Surv. Illinois, V, 1873, p. 535, pi. xx, fig. 4. 

 Cyathocrinus inflatus Wachsmuth and Springer, Rev. Palseocrinoidea, I, 1879, p. 



148 (catalogue name). 

 Coeliocrinus cariniferous Wachsmuth and Springer, Rev. Palseocrinoidea, 1, 1879, 



p. 133 (catalogue name). — Miller, North Amer. Geol. and Pal., 1889, p. 233 



(catalogue name).— Weller, Bull. No. 153, U. S. Geol. Surv., 1898 p. 185 



(catalogue name). 



The description by Troost is as follows : 



This crinoid deviates somewhat from the genus Cyathocrinites having instead of one 

 interscapular [interbrachial], four small plates which occupy a space partly between 

 the costals [radials] and the scapulars [primaxils], and the scapulars [primaxils] rest 

 immediately upon the costals and not between them. The pelvis [base] is divided 

 into five plates, which support five subpentagonal costals [radials] and these support 

 five pentagonal scapulars [primaxils], upon which follow five arms with cuneiform 

 terminations supporting two hands, being subdivided into two feathered fingers. 



The capital integument is remarkable in this species. It does not, as in most of the 

 crinoidea, terminate in a proboscis like aperture, or in a simple dome; but it rises above 

 the cup, contracting gradually till it has about half the diameter of the cup when it 

 increases again gradually in size, surpassing the diameter of the cup and terminates 

 globular. The whole of the coronal integument resembling an elongated inflated blad- 

 der, much surpassing in length the whole cup — The cup of the specimen now before 

 me, from its base to the superior part of the costals [radials] having about 6 mil. m. 

 in height, while from the superior part of the costals [radials] to the termination of the 

 integument its height is 18 mil. m. and its greatest diameter 9 mil. m. 



Occurs very rarely in the oolitic limestone of the Cumberland Mountains, in Ten- 

 nessee, and more abundantly in the vicinity of Huntsville, Alabama. 



Observations. — The Troost collection contains four well-preserved 

 specimens of this little species. Three of them show the balloon- 

 shaped ventral sac distinctly, and one has the anal area especially 

 well preserved. 



Formation and locality. — St. Louis limestone. Near Huntsville, 

 Alabama; Cumberland Mountains, Tennessee. 

 Cat. No. 39943, U.S.N.M. 



