778 THE CRINOIDEA CAIIERATA OF NORTH AMERICA. 



have two costals, as all other Dicliocrini, and Miller overlooked the syzygial 

 suture, which is often quite obscure in this genus. This form should be 

 compared with D. ficus, with which it is probably synonymous. 



Dichocrinus parvulus S. A. Miller. 



1801. S. A. MiLLEK ; 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 — accoi'ding 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. 



Horizon and Locality. — Lower part of Warsaw limestone; Boonville, Mo. 



Type in the collection of Mr. E. A. Blair, Sedalia. 



Dichocrinus Blairi S. A. Miller. 

 Plate LXXV. Fig. S. 



1891. S. A. MiLLEK ; Mt. Sheets 17tli Rep. Geol. Surr. Indiana, p. 36, Plate 8, Pig. 12. 



Calyx short, obconoidal or subturbinate ; plates thin ; surface granular. 

 Basal cup a little more than one third the length of the calj'x to the top 

 of the radials; the re-entering angles rather deep. Radials slightly ex- 

 panding, twice as long as wide, longitudinally convex, and projecting at 

 the facets, which occupy half the width of the plates, and slope downward. 

 Costals two, supporting 2X2 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. 



Horizon and Locality. — Same as last. 



Ty]}e in the collection of Mr. E. A. Blair. 



llemarks. — The calyx of the type specimen is much flattened, and it is 



