ACTINOCRINID &. O79 
arms from the axillary. Arms six to the ray, rounded on the back* and 
slightly tapering, biserial from the third plate up. Pinnules extremely long, 
and to nearly their full length provided with small hooks, which slightly 
overlap the adjoining pinnule above. Regular interbrachials: 1, 2, 2; the 
anal plate followed by 2, 3, and 3 plates. Structure of the ventral disk un- 
known. Anal tube long, slender in the upper part, and composed of small 
convex pieces. Column of more than average size; the nodal joints pro- 
jecting, and rounded at their outer margins. 
Horizon and Locality. — Waverly group ; Richfield, Ohio. 
Types in the New York State Cabinet at Albany, N. Y. 
Remarks. — This and the two preceding species form a little group by 
themselves, approaching in some of their characters Cactocrinus ; but they 
must be referred to Actinocrinus, as the arms of the different rays are 
arranged in groups, which are separated by a number of interbrachial 
plates, and the bifurcations above the distichals take place from the sec- 
ond plate of each order, and not from the first as in that genus. 
Actinocrinus asperrimus (M. and W.). 
Plate LX. Figs. 5 and 6. 
1869. Strotocrinus (?) asperrimus — Mrnx and WortuEn; Proceed. Acad. Nat. Sci. Phila, p. 160. Also 
Geol. Rep. Illinois, Vol. V., p. 849, Plate 8, Fig. 3. 
1881. <Actinocrinus asperrimus — W. and Sp.; Revision Paleoer., Part II., p. 142. 
Calyx of medium size, urn-shaped, its width at the arm bases equal to its 
length. Dorsal cup ‘obconical to the top of the costals; the distichals and 
the succeeding fixed brachials spreading horizontally, but without forming a 
continuous rim, there being deep interradial grooves, and smaller ones be- 
tween the main branches of the rays. Plates almost flat to strongly convex, 
their ornamentation somewhat variable, Figs. 5 and 6 representing the ex- 
tremes, and the type figured by Meek and Worthen an intermediate form. 
In all these specimens, however, there are ridges radiating from the centres 
of the plates to adjoining ones, three generally between the radials and 
basals, and one between the other plates. 
Basals three times as wide as high, deeply grooved along the sutures, 
and distinctly lobed from a dorsal aspect; the lower edges scalloped and 
* A flattening of the arms, as described by Hall, does not exist in any of our specimens. 
