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606 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Cactocrinus reticulatus, var. ovatus (Hatt). 
Plate LVIL, Fig. 11. 
1861. Actinocrinus ovatus —WHaut; Descrip. New Paleoz. Crin., pe Lo; 
This form scarcely deserves the rank of variety. It differs from C. redi- 
cwlatus in the more rounded form of the dorsal cup, and the less expansion of 
the arm bases; in the more depressed form of the ventral disk, its shorter 
spines, and in the ornamentation of the dorsal cup. ‘The radials and cos- 
tals are traversed by three parallel ridges, which pass into the basals, and 
generally terminate in denticulate nodes at their lower margins; the ridges 
between the interbrachials of first and second order, and toward radials and 
costals being double, all others single. 
Horizon and Locahty. —Same-as last. 
Cactocrinus denticulatus W. and Sp. (nov. spec.). 
Plate LVIL. Figs. 5a, 6. 
Calyx of medium size, abruptly spreading above the distichals; the sur- 
face ornamented by radiating ridges and nodes similar to those of C. reticu- 
latus ; the arms covered profusely with tooth-like projections. 
Basals of moderate size, their lower margins projecting beyond the sides 
of the column. Radials as large as both costals together, wider than long, 
and covered with a conspicuous transverse node, from which the ridges pass 
out to all sides, there being three ridges to the basals and costals, and one to 
each interbrachial. First costals hexangular, smaller than the second, the 
latter heptangular. Distichals a little smaller than the costals. Palmars 
short, and narrower than the breadth of the arms; three of each ray trun- 
cated, giving off simple arms, the fourth axillary and followed by post- 
palmars. Arms crowded and their bases bending outward; normally five to 
the ray; long, very heavy, infolding, and of uniform thickness throughout, 
but flattening toward the extremities. They are composed from the second 
joint up of two series of moderately long, convex pieces, which are sur- 
mounted by two sharp elongate nodes. The nodes increase in length up- 
ward, arranged in longitudinal rows; two of them running along the sides 
of the arms, and the others along the middle, on each side of the median 
suture line, giving to the arms a somewhat angular outline. Pinnules pro- 
