THE SCIENTIST. 
99 
spf'ciinoii illustrated was the only one 
found. 
CODASTEIl GllACILLniUS, 11. Sp. 
rhite IL Fig. 6. idcXe vIp.w. Fig. 7, svm- 
mit view. 
0;ilyx,el(»ng-ate-pyrMuiid.il; btise, point- 
ed; su'.ninit, excavated alou^ tiie rays; 
the auibulacr.i f^epirated by iuteiTadial 
processes; a summit view o'ives a pen- 
ta.i^onal outline at the outer ends ot the 
am^^ulacra. Basal plates form a slender 
cup. in lenorth less than the radials. 
Rulial plates lon^ii:and arched, with limbs 
pr()ji'Ctin,i>- a little beyond the summit; no 
depression at the anal interradius. Siiuis- 
es rather wide and deep, with steep 
sloping sides. The ambulacra do not 
occupy the entire leno^th of the sinuses, 
the right and h^ft anterior rays being 
broadest and sub-petjiloid, while the re- 
maining three are elongate-triangular. 
Lancet plate not visible. Side plates 
cannot be well made out. The ambulac- 
ra are very convex, standing up as ri<1g- 
es. Hydrospire slits flue, crowded. 
Central opening not closed in the two 
specimens discovered. Anal opening 
apparently triangular. Surface orna- 
mented by dist inct straight lines parallel 
to the edges of the plates. A basal view 
of this fossil gives a triangular outline. 
The columnar scar is round, occupying 
nearly the entire bottom of the base. 
Hydrospire slits in ten groups. 
Collected in the soft cherts of the 
Lower Burlington Limestone at Louis- 
iana, Mo. From the fact that this spec- 
imen was collected in the cherts, may lead 
some one to think the specimens are 
casts, but they are not. 
CODASTER GRANDIS, n. Sp. 
Flate II. Fig. 6\ side view of the body. 
This species is described from a beau- 
tifully preserved natural cast. Calyx 
above the basal plates, an inverted fi us- 
tiumofa pyramid, strongly pentagonal. 
Two of the basal plates pentagonal and 
large, while the third is smaller and 
quadrangular; just inside of the angles 
below, there is on each plat' , a strong 
[)rominence which would give to a spec- 
imen preserving the test, a strong tri- 
lobate outline to the base. Radial plates 
longer than wide with a prominent cen- 
tral node; the limbs not as high as the 
top of the vault. Oral ildges prominent. 
A sub-ambulacral duct or canal is repre- 
sented by a strong rod on the cast. Of 
the ambulacra themselves nothing can be 
learned. 
There are ten series of hydrospire 
slits, nine to the series, making ninet}^ in 
all. 
Summit of the body, broad, slightly 
convex. Central and anal openings 
prominent. Widest part of the body at 
the extremities of the radial limbs. 
Oihei- feaiures cannot be made out. 
The ten sets of hydrospire slits pos- 
sessed by this species,as well as by Codas- 
ter gracillimus would seem to place both 
species under Etheridge and Carpenter's 
genus Ph(EnosGliisma^ but externallj'^ 
they have a strong resemhlance to Ca- 
daster, especially C.grandis^ which forci- 
bly reminds one of the British species 
C. trilohatus. 
Collected in the Burlington chert 
(upper) at Louisiana, Mo. 
Granatocrinus excavatus, n. sp. 
Plate IL Figs. 9 and 10, side and 
summit views. 
Body oval; base deeply concave; rad- 
ial plates abruptly bent inward and up- 
ward at the lower extremities of the 
ambulacral areas, to meet the upper 
edges of the basal plates; the radials in 
length equaling half the height of the 
body and separated by well marked sut- 
ures. Between the lower extremities of 
the ambulacra the surface of the radials 
becomes concave while it is merely flat 
