54 BULLETIN 64, UNITED STATES NATIONAL MUSEUM. 



The basals are very minute, only their outer angles projecting 

 beyond the column. The radials are traversed for about half their 

 length by a median groove which terminates in a dilation at about 

 the center of the plate. The faint ridges around these dilations form 

 the angles of the pentagonal basal excavation. 



The species recalls Eucalyptocrinus nodulosus Weller in the char- 

 acter of the base, but is distinguished from the latter by the minute 

 basals and the absence of surface ornamentation. It is also much 

 smaller than Weller's specimens. 



Formation and locality. — Brownsport limestone. Decatur County, 

 Tennessee. 



Cat. No. 39955, U.S.N.M. 



EUCALYPTOCRINUS VENTRICOSUS Wachsmuth and Springer. 



Eucalyptocrinites crenatus Troost, MSS., July, 1850. 



Eucalyptocrinus coelatus Roemer (not Hall, 1843), Sil. Fauna, d. westl. Tenn., 



1860, p. 48, pi. iv, figs. 3a-c. 

 Eucalyptocrinus ventricosus Wachsmuth and Springer, North Amer. Crinoidea 



Camerata, 1897, p. 341, pi. lxxxiii, figs. 11, 12. 



Troost's description of this species is as follows: 



I possess only the cup of this species, — its surface is prettily ornamented with 

 rosettes and rhomboidal figures slightly in relievo, by which all the points of the 

 plates are obliterated. This specimen is interesting as it shows the difference between 

 the plates that are supported by the large heptagonal [decagonal] intercostals [inter- 

 brachials] and those that proceed from the cuneiform arms; they each support a solid 

 septum, but those that proceed from the heptagonal intercostals are double, while 

 the others are single and not so broad. — This species shows also the great thickness 

 of the shell and consequently the smallness of the internal cavity. 



There seem to be no constant characters by which these speci- 

 mens can be distinguished from those found by Roemer in western 

 Tennessee. 



Formation and locality. — Brownsport limestone, Eucalyptocrinus 

 zone of the Beech River formation. Decatur County, Tennessee. 

 Cat. No. 39956, U.S.N.M. 



EUCALYPTOCRINUS GIBBOSUS Troost. 



Plate 10, figs. 3, 4. 



Eucalyptocrinites gibbosus Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 



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

 Eucalyptocrinus gibbosus Shumard, Trans. Acad. Sci. St. Louis, II, No. 2, 1866, 



p. 370 (catalogue name). — Wachsmuth and Springer, Rev. Palseocrinoidea, 



III, 1885, p. 128 (catalogue name). — Miller, North Amer. Geol. and Pal., 



1889, p. 244 (catalogue name). 



The original description by Troost is as follows : 



The form of the cup is intermediate between that of the E. splendidus and the E. 

 crenatus, and it differs in some respects from all the species in my possession. Its 

 arm plates which in all other species are incased in an almost rectangular excavation, 



