TROOST *S CRINOIDS OF TENNESSEE E. WOOD. 45 



Observations. — The genus Turbinicrinites was founded upon one 

 specimen in a collection of six individuals. In this specimen the lower 

 margin of the first anal plate truncates the upper edge of the posterior 

 basal (plate 10,. fig. 6). This structure was produced by the earlier 

 introduction of the anal plate, causing it to occupy a lower position 

 in the calyx than in normal individuals. The specimen is otherwise 

 indistinguishable from undoubted specimens of Melocrinus roemeri 

 with which it is associated. This fact and the absence of other speci- 

 mens showing similar variation has led to the conclusion that the 

 lower position of the anal plate is an abnormal feature characteristic 

 of a single individual only. 



A detailed description of the plates of the calyx is given by Roemer 

 [1860, p. 56] in the original description of the species. Having only 

 imperfect specimens Roemer described the basal plates as three in 

 number, an error which was corrected by Wachsmuth and Springer 

 [1881, p. 119]. 



Formation and locality.—- Brownsport limestone. Decatur County, 

 Tennessee. Also recorded by Roemer from Beargrass Creek, Ken- 

 tucky. 



Cat. No. 39919, U.S.N.M. 



MELOCRINUS OBLONGUS Wachsmuth and Springer. 



Melocrinus oblongus Wachsmuth and Springer, North Amer. Crinoidea Camerata, 

 1897, p. 300, pi. xxii, figs. 9, 12. 



An unlabeled specimen in the Troost collection is evidently of this 

 species. It retains the basals and the plates of two rays as far as the 

 arm bases. 



Formation and locality. — Brownsport limestone. Xo locality is 

 given for the specimen, but the matrix and manner of preservation 

 indicate that it is probably the same as that of other specimens of 

 Melocrinus in the Troost collection, that is: Decatur County, Tennes- 

 see. Wachsmuth and Springer give St. Paul, Indiana, and near 

 Louisville, Kentucky, as localities for the species. 



Cat. Xo. 39981, U.S.N.M. 



Family EUCALYPTOCRIXID.E Roemer. 

 Genus EUCALYPTOCRINUS Goldfuss. 

 The original description by Troost is as follows : 



It is with pleasure that I embrace the opportunity afforded me by my situation in the 

 midst of a rich fossil region wherein circumstances have placed me, to throw some light 

 upon an interesting and beautiful fossil of which several hitherto unknown species 

 occur in the State of Tennessee, belonging to a genus which as far as I know (The works 

 that speak of this genus, known to me, are Goldfuss's Petrefacta and Phillips in Mur 

 chison's Silurian System) has been imperfectly described. Goldfuss who first described 

 it under the name of Eucalyptocrinites, having a very mutilated specimen from Eifel, 

 imagined that it had no column, and consequently gives an erroneous description of 



