a= 
BATOCRINID.2. 387 
second pentangular, their sloping upper faces placed at right angles. Dis- 
tichals two, the axillary considerably wider. Palmars three, shorter than the 
distichals, in contact laterally, and so arranged that the salient angle of one 
plate rests within the retreating angle formed by the two adjoining picces. 
Arm openings directed horizontally, arranged in groups, the interspaces 
between the rays being wider than the others. Arms twenty, exceptionally 
twenty-two, when there are five in the two posterior rays. According to 
Lyon and Casseday, the arms are four inches long, subcylindrical to one 
third their length, when they flatten and expand upwards, reaching at 
midway a width of half an inch, and a depth of one sixteenth, but higher 
up their width is reduced to one half, and they end in a rounded edge. 
The arms are biserial above the first or second free plate. The plates are 
short near the calyx, but increase in length upward. Interradials two to 
three; the first rising to one half the height of the first distichals. The 
anal interradius has six plates above the anal, arranged in two rows. 
Ventral disk high-conical, surmounted by a small, almost central anal tube; 
the plates large and tumid. 
Horizon and Locality. — Keokuk group; Clear Creek, Hardin Co., Ky.; 
New Ross, Montgomery Co., Ind.; Pilot Knob, near Louisville, Ky.; and 
White’s Creek Springs, near Nashville, Tenn. 
Type in the collection of the late S. A. Casseday. 
Eretmocrinus ramulosus (Hatt). 
Plate XX XVII, Figs. 4a, b, and 5 a, b, e, d. 
1858. Actinocrinus ramulosus — Hatt; Geol. Rep. Iowa, Vol. I., Part IL., p. 615, Plate 15, Fig. 7. 
1881. Hretmocrinus ramulosus —W. and Sp.; Revision Paleocr., Part IL, p. 173. 
Not Hretmocrinus ramulosus W. and Sr. ; 1878, Proceed. Acad. Nat. Sci. Phila., p. 236 = Hretmocrinus 
remibrachiatus, var. expansus. 
The largest species of this genus. In its general aspect closely resem- 
bling L’. magnificus, but more rugose; the ridges and nodes more prominent ; 
the base narrower; the ventral disk larger, and hemispherical instead of 
conical; the anal tube much smaller, being reduced to the minimum. 
Dorsal cup short, rapidly spreading, truncate at the base. Plates elevated 
and covered with sharp central tubercles; those upon the radials and 
brachials confluent, forming undulating angular ridges, which branch upon 
the axillaries and pass into the arms, producing deep depressions between 
the various divisions of the rays. The radials and brachials have two addi- 
