PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 257 



thick and often massive. This delicacy of structure is probably a ge- 

 neric characteristic. 



Lecythiocrinus oUiculaefonnis (si), iiov.). Plate 1, figs. 4 aud .5. 



Body small, subovoid or pot-shaped, higher than broad, broadest a 

 little below the middle, composed of thin i)ieces ; base convex ; basal 

 pieces rather small but not minute ; subradial pieces larger than any of 

 the others, higher than wide, their height equal to a little more than 

 half the full height of the body, not materially varying iu size or 

 shape ; first radial pieces smaller than the subradials but larger than 

 the basals, broader below than above, height and greatest breadth about 

 equal ; at top, on both sides of the small prominent arm-facet, the 

 border of each first radial is bent inward, constricting the already nar- 

 row interbrachial space at the top of the body, which space was prob- 

 ably covered by a dome of minute pieces. Sutures not impressed or 

 otherwise specially marked. Surface, to ordinary vivsion, apparently 

 smooth, but a good lens shows it to be very finely granular. 



Height, 9 millimeters ; breadth, 7.J millimeters. 



Position and locality. — Upper Coal Measure strata, thirty miles west of 

 Humboldt, Kansas. See introductory remarks. 



Genus Erisocrinus, Meek and Worthen. 



Erisocrinus planus (sp. iiov.). Plate 1, figs. G and 7. 



Body rather small, subcircular or obscurely pentahedral as viewed 

 from above or below, shallow convex-basiu-sliaped from the toj) of the 

 first radials downward ; base somewhat deeply impressed at the center, 

 the depression gradually rounding outward to the sides; basal pieces 

 very small, occupying the bottom of the depression of the base and al- 

 most covered by the first joint of the column ; subradial jneces mod- 

 erately large, their inner ends bent inwardly by the depression of the 

 base to meet the small basal pieces there, their outer ends extending 

 outward and upward so as to be more or less plainly visible by side 

 view of the body ; first radial pieces comparatively large, convex verti- 

 cally, their upper edges rounded inward to the suture between them and 

 the second radials, their lower angles extending downward almost to 

 the lowest portion of the body visible by side view. The otlier charac- 

 ters are those common to the genus. One minute piece remains attached 

 to the upper border of the calyx of one of the specimens, at the junction 

 of two of the first radial pieces. This is no doubt an anal piece, its 

 outer surface being in the j^lane of the outer surface of the calyx, but 

 it does not in any degree enter between the two first radials upon which 

 it rests. 



Transverse diameter of the calyx, 14 millimeters ; height of the same, 

 5 millimeters. 



Proc. Nat. Mus. 79 17 Jan. 37, 1 880. 



