. > 
~ - = v 
, SS a ‘ = 2 ‘ 
a Se 
ACTINOCRINID&. 625 
Type in the collection of Hon. Delos Arnold, Pasadena, California; other 
specimens in the collection of Wachsmuth and Springer. 
Remarks. — This species differs from C. nodobrachiatus in the smaller 
number, and the less spreading of the arms, as well as in the construction 
of the ventral disk; from C. ornatissimus in the form and proportions of the 
dorsal cup, and the ornamentation of the plates. 
Cactocrinus glans Hatt. 
Pg Vig TAGS MOC Ome 
1860. Actinoerinus glans —Hati; Suppl. Geol. Rep. Iowa, p. 16. 
1881. <Actinocrinus glans —W. and Spr.; Revision Paleocr., Part IL, p. 148. 
1893. Actinocrinus glans — WutrrretD, Mem. Am. Mus. Nat. Hist. New York, Vol. I., p. 10, Plate I., 
Figs. 11, 12. 
Syn. Actinocrinus tholus Hatt; 1860, Suppl. Geol. Rep. Lowa, p. 35. 
Syn. Actinocrinus eryx Hatt; 1861, Descrip. New Pal. Crin., p. 12. 
Syn. detinocrinus Blairi 8. A. Miuuzr; 1892, Ady. Sheets Geol. Surv. Indiana, p. 35, Plate 5, 
Figs. 27 and 28. 
A rather large species. Calyx subovate, a little longer than the width 
at the arm bases. Dorsal cup abruptly spreading above the distichals, its 
height fully twice that of the ventral disk. Plates of the dorsal cup from 
almost flat to nodose; the surface smooth, except that the radials occasion- 
ally show faint indications of strie at their lower ends. Suture lines rather 
distinct. 
Basals large, forming a cup, twice as wide as high, a little excavated at 
the lower end, its sides slightly spreading or convex. Radials twice as large 
as the costals, longer than wide, the upper sloping faces much shorter than 
the lateral ones. Costals as wide as long, the first hexagonal, the second 
heptagonal. Palmars in contact laterally, each one supporting an arm, 
which is free from the second plate. Arm facets large, directed obliquely 
upwards, and concave; the respiratory pores placed very close to the ambu- 
lacral openings, and the thin partition walls rarely intact; ambulacral open- 
ings nearly equidistant. Arms twenty, very long, moderately heavy, and 
rounded on the back, the tips not incurving, and the spines of the pinnules 
small. Regular interbrachials from eight to ten: 1, 2, 2, 2, 2, 1; gradually 
decreasing in size in ascending order. The anal plate in large specimens ifs 
followed by 2, 3, 4, 3 and 2 plates. Ventral disk regularly convex; com- 
posed of but few, comparatively large, and almost flat pieces, of so irregular 
arrangement that neither the orals nor radial dome plates can be recog- 
79 
