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784 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
of four or five moderate sized plates, followed by a very large number 
of small pieces, forming an elongate, convex area, which rises from the 
large anal plate, and extends to the posterior oral, being surrounded on all 
sides by a shallow groove. The plates of the area, although irregular in 
form, are arranged with a certain regularity, and the lower ones are con- 
siderably larger than those surrounding the anal opening, which are very 
minute. The anus is located in the upper part of the area, and opens out 
laterally. Column small and round. | 
Horizon and Locality.— Upper part of St. Louis group; Franklin Co., 
Ala., and Tateville, Pulaski Co., Ky. 
Type in the Shumard collection at the Museum of Washington University, 
St. Louis. | 
Talarocrinus sexlobatus (Suvum.). 
Plate LXXVIILT. Figs. 1a, b, c. 
1856. Dichocrinus sexlobutus —Suvmarpd; Trans. St. Louis Acad. Sci, Vol. I, p. 73, Figs. 8, 3a-e. 
1865. Pterotocrinus sexlobatus —SuumMaRD; Catal. Paleeoz. Foss. N. Amer. p. 394. 
1867. Pterotocrinus serlobatus —S. A. Minter; Catal. Amer. Paleoz. Foss. (1st Edit.), p. 89. 
1881. Talarocrinus sexlobatus —W. and Sr.; Revision Paleoer., Part II., p. 87. 
1883. Talarocrinus sexlobatus —S. A. Mittur; Catal. Amer. Paleeoz. Foss. (2d Hdit.), p. 288. 
Calyx a little higher than wide, constricted at the arm regions, and 
surmounted by five short heavy spines. Dorsal cup more depressed than 
in the preceding species, the plates more rapidly spreading and more tumid, 
making the outline of the cup, as seen from below, quite distinctly six-lobed. 
The plates devoid of ornamentation. 
Basal cup shallow, its height from a side view less than one fourth the 
length of the radials; the salient angles at the upper margin very obtuse, 
as are also the re-entering angles toward the anal plate and anterior radial ; 
the centre slightly excavated for the reception of the column. Radials about 
as wide as long, widest at two thirds their height, very thick and tumid in 
the middle; their greatest convexity is near the upper end, whence they 
slope rapidly to the arm bases, forming a rounded, transverse node. The 
lower faces in four of the radials are straight, or nearly so, in the anterior 
one obtusely angular; all the superior faces are deeply excavated, and their 
outer ends project somewhat like the limbs of the radials in Blastoids. The 
anal plate is longer than the radials, and, like them, tumid near the top and 
widest across the middle. Costals very small, not visible externally, being 
perfectly covered by the distichals. Distichals comparatively large, resting 
