A NEW FOSSIL CRINOID GENUS—KIRK 155 
separated at their bases. This gives the crown the more open char- 
acter characteristic of the earlier species. 
The dorsal cup has an approximate diameter of 20 mm. and a 
height of approximately 7.5 mm. The sides of the cup are some- 
what convex, giving the cup a bowl-shaped contour. The plates are 
tumid. The most striking feature of the cup, and the character 
that can best be used to identify the species, is the radials. These 
are very highly convex and might readily be taken as part of the 
IBr series. This, of course, means that the interradial vertical groove 
is very deep. 
The proximal portions of the arms are widely separated as between 
adjacent rays. The brachials have highly arched backs and are 
deep. The / and //Az are smooth. One //7Aw# shows a short, blunt 
spine. In the higher orders of Br many brachials fail to reach to the 
far side of the ramus. 
Horizon and locality——Troost’s original label and manuscript give 
no information about the specimens other than “Lawrence County, 
Tennessee.” Many specimens were given to Troost, and at times 
his localities are erroneous. In this case the locality may well be 
correct. Charles Butts, who knows the general region well, says 
that beds as high as Gasper may occur in the county. The lithology 
of the rock might well be Gasper. The crinoid itself suggests a 
higher horizon than Ste. Genevieve. Until proved otherwise, we 
may accept the locality and assume a Gasper age. 
LITERATURE CITED 
TRBOOST, GERARD. 
1849. Communication. Amer. Journ. Sci. and Arts, ser. 2, vol. 8, No. 24, 
pp. 419-420. 
1850. A list of the fossil crinoids of Tennessee. Proc. Amer. Assoc. Adv. 
Sci., 1849, pp. 59-64. 
1909. A critical summary of Troost’s unpublished manuscript on the crinoids 
of Tennessee. (Edited by Elvira Wood.) U. S. Nat. Mus. Bull. 
64, xi+150 pp., 15 pls. 
WACHSMUTH, CHARLES, and SPRINGER, FRANK. 
1880. Revision of the Palaeocrinoidea: Pt. 1, pp. 1-153, pls. 1-3 (15-17). 
Proc. Acad. Nat. Sci. Philadelphia, 1879, pp. 226-376, pls. 15-17. 
WorTHEN, AMOS HENRY, in Worthen, A. H., and Meek, F. B. 
1875. Description of invertebrates. Illinois Geol. Surv., vol. 6, pt. 2, sect. 
2, pp. 489-532, pls. 23-83. 
U.S. GOVERNMENT PRINTING OFFICE: 1942 
