’ 
Se eee — — 
s = = cian attains on Fe a a 
~~ - J = = Sete — SE — 9 a eek 
778 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
have two costals, as all other Dichocrini, and Miller overlooked the syzygial 
suture, which is often quite obscure in this genus. This form should be 
compared with D. jicus, with which it is probably synonymous, 
Dichocrinus parvulus 8. A. Miniter. 
1891. S,. A. Minzur; Geol. Surv. Missouri, Bull. 4, p. 27, Plate 4, Figs. 7, 8. 
Calyx small. Dorsal cup higher than wide, somewhat obconical; sutures | 
slightly depressed, giving a little convexity to the plates; surface granular. 
Basals forming a short obconical cup, twice as wide as high, pointed to the 
small column below; the re-entering angles toward the basi-radial suture 
deeper at the posterior side than at the anterior. Radials one half longer 
than wide; their width increasing upwards; the facet broad and but slightly : 
excavated. Costals one — according to Miller, but probably two —a little 
wider than long, and occupying three fourths of the width of the radials. | 
Arms ten, rounded on the back, and composed of a single series of short 
cuneate pieces. Pinnules heavy and closely packed. Anal plate a little | 
narrower than the radials. Column round. 
Se ae Se 
| florizon and Locality. — Lower part of Warsaw limestone; Boonville, Mo. | 
| Type in the collection of Mr. R. A. Blair, Sedalia. | 
Dichocrinus Blairi S. A. Mitter. 
: icone 
| ae | 
We Ey | | Plate LXXV. Fig. 3. | 
Nyy | io 
Nt | Ht 1891. S.A. Mituzr; Adv. Sheets 17th Rep. Geol. Surv. Indiana, p. 36, Plate 8, Fig. 12. 
| ie Ap a Calyx short, obconoidal or subturbinate; plates thin; surface granular. 
Basal cup a little more than one third the length of the calyx to the top 
7 Ri} of the radials; the re-entering angles rather deep. Radials slightly ex- | 
panding, twice as long as wide, longitudinally convex, and projecting at | 
k | |p l the facets, which occupy half the width of the plates, and slope downward. 
me ie Costals two, supporting 2 X 2 distichals, which apparently are free from the 
costal axillary. Arms four to the ray, large, long, and composed of a single 
series of short, cuneiform pieces. Pinnules long and heavy. Column round, 
composed of short pieces; the nodal ones somewhat projecting. 
i , | a Horizon and Locality. — Same as last. 
a Hi | | | | Type in the collection of Mr. R. A. Blair. 
= ae Ltemarks, —- The calyx of the type specimen is much flattened, and it is 
x a 
