WuHITE.] CARBONIFEROUS FOSSILS. 163 
at the sutures by the prominence of the middle portion of each basal 
piece; column-facet large; first radial pieces nearly equal in size with 
the basals, and, with that exception, they are the largest pieces in the 
body; second and third radials about equal to each other in size, and not 
more than half as large as the first radials; each third radial piece bear- 
ing two secondary rays consisting of two pieces each, both of which are 
smaller than the second and third radials; each second secondary radial 
piece bearing two brachial pieces, and each brachial piece giving origin 
to an arm, making twenty arms in all.* Arms long and slender, and 
above the first four or five brachial pieces, which are single, they are 
composed of a double series of minute pieces which meet along the 
median line of the arm, forming there a zigzag suture. Anal pieces 
eight or nine; the first one being of about the same size as the first 
radials; the next three pieces above are about half as large as the 
first, and above these the other pieces are quite small; interradial 
pieces three or four, the first one being somewhat larger than the 
second radials, and occupying about half the interradial space. Vault 
convex or subconical, more than half as high as the height of the body 
below the arms, composed of irregular pieces of moderate size, all of 
which are more or less sharply tumid in the middle, and ending at the 
summit in a long, strong proboscis, which is composed of similar sharply 
tumid pieces. All the body plates are strongly tumid, the lower ones 
bearing each a strong transverse projection. 
The specific name is given in honor of Mr. Charles Wachs cuth, whose 
excellent labors among the Crinoidea are well known. 
Position and locality—Subearboniferous strata probably equivalent 
with those of the Keokuk division, Crawfordsville, Ind., where it, was 
obtained by Mr. William Gurley. 
Genus LEPIDESTHES Meek & Worthem. 
LEPIDESTHES COLLETTI White. 
Plate 40, figs. 2 a and b. 
Lepidesthes colletti White, 1878, Proc. Acad. Nat. Sci. Philad., p. 33. 
General form apparently ovate. Interambulacral areas very narrow, 
linear, slightly convex from side to side, composed of four or five rows 
of small pieces, which rows do not apparently decrease in number, ex- 
cept perhaps near each extremity. Ambulacral areas broad, partaking 
of the convexity of the body, lance-oval in outline, and five or six times 
as broad as the interambulacral areas are. Ambulacral areas made up 
of very numerous small rhombic pieces, the transverse diameter of which 
is a little greater than the vertical; their lateral angles moderately acute, 
and interlocking so that they appear to be arranged in oblique rows; 
size of the pieces nearly uniform throughout the field, except that they 
all become a little smaller near both the upper and lower extremities. 
The number of vertical rows of pieces in each field is apparently 18 or 20. 
Each ambulacral piece has two distinct round pores near each other and 
near the upper angle of the piece; but they are sometimes obscured by 
the overlapping of adjacent pieces. Surface granules small, more dis- 
tinct upon the interambulacral than upon the ambulacral pieces. 
Two examples of this species have been discovered, both of which are 
* The example represented by fig. 1 } of plate 40 has an extra arm-base immediately 
over the center of the anal space, and it also has an extra basal piece about one-third 
as large as each of the other three basal pieces. 
