100 
THE SCiENTlST. 
above. InteiT;i(li:il and aiinl pieces half 
the height of the body, flat below but 
becoming concave above and forming 
slight ridges about the ambulacra. Am- 
bnlaci-a uarrow and extending the en- 
tire length of the body (down to the bas- 
al cavity); side pieces numerous. The 
ambulaci-a extend beyond the general 
surface of the body and on a plane with 
the ridge-like edges of the interradials 
nnd the immediate mnrgins of the i-adial 
pieces, giving at the top of tlie body and 
the lower ends of the ambuhicra a sub- 
pentngonnl outline with five flat topped 
ridges. Anal opening round: spij-acles 
small, hardly discei-nible, eight in num- 
ber. Surface of interradials covered 
with longitudinal rows of rather coarse 
granules while the radials are ornament- 
ed by much smaller and crowded ones. 
The specimen figured was picked up in 
the gravel at Louisiana, Mo., and, doubt- 
less is from the Burlington Limestone. 
GRANATOCRINUS EXIGUUS, U.sp. 
Plate 11. Figs, 13 and 14 side and 
summit views . 
Body globose, base small and i-ather 
deeply concave. Radial pieces nearly 
equalling the entire length of the bod}^, 
divided nearly their entire length by the 
ambulacra. Interradial and anal plates 
very noticeable as they are flattened and 
liavea diff'erent ornamentation from those 
on the radials. Ambulacra moderately 
broad, tapering slightly downward, with 
thirty or more side plates to each half 
ambulacrum. Between the sides of the 
interradials, the ambulacra extend as 
convex ridges above surface of the plates 
but downward they are hardly as prom- 
inent as the slightly raised margins of the 
radial pieces, either side of them. The 
lower ends of the ambulacra are received 
into projecting angles that give the ap- 
pt^arance of five little feet, slightly di- 
rected outward. Between these project- 
ing points the surface of the radials is 
concave. A cross section about tlie 
middle of the body of the fossil gives 
almost a circular outline. 
The ornamentation of the interradials 
are fine cross lines, following the direc- 
tion of the triangular suture or union of 
the interradials with the radials. The 
radials are set with small granular prom- 
inences, and, begimiing with the down- 
ward angles of the radio-inter-radial 
sutura, an elongate triangle extends and 
widens till its basal angles reach the 
ambulacra just above their extremities 
below, appearing as a median, slight y 
raised field. This field is not noticeable 
on small specimens. Anal opening under 
a small pi-ominence. Spiracles not ob- 
served. 
This fossil may posnbly be Meek and 
Worthen's G. j^isum, but it is from an 
entirely ditferent )»orizon, iiaving been 
collected from the base of the Lower 
Burlington limestone at Louisiana, Mo. 
Ci^DONITES INOPINATUS, U. sp. 
Flate 11. Figs. 11 and 12, side and 
summit views. 
Body sub-oval; length greater than 
width, the widest part being near the 
summit. Base sliglitly convex, the 
plates being tumid, giving a tri-node 
appearance around the base of the col- 
umn. 
Radial plates more than two-thirds the 
height of the entire body. The interra- 
dials meet the radials below in a slightly 
triangular suture. The anal plate sup- 
ports at the summit a tri -pointed spine- 
like projection, overshadowing the anal 
opening. 
Ambulacra rather narrow, widest above 
and slightly tapering downward, termi- 
nating in little pointed projections, di- 
rected out horizontally- In length the 
ambulacra are about seven-eighths of the 
entire body, with about fifty side pieces 
to the field. Between the lower extrem- 
ities of the ambulacra, the radials are 
