466 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Dorycrinus subturbinatus (M. and W.). 
Plate XLII. Figs. 10a, b. 
1860. <Actinocrinus (Amphoracrinus) subturbinatus — Munk and WortHen; Proceed. Acad. Nat. Sci. 
Phila., p. 388. 
1866. Amphoracrinus subturbinatus —M. and W.; Geol. Rep. Illinois, Vol. IL., p- 212, Plate 15, Figs. 
4a, b. 
1873. Dorycrinus subturbinatus —M. and W.; ibid., Vol. V., p. 380. 
1881. Dorycrinus subturbinatus —W. and Sp. ; Revision Paleoer., Part II., p. 179. 
A small species, in the form of the calyx resembling D. mississippiensis. 
Dorsal cup broadly obconical; the sides straight from the column to the 
arm bases, with a shallow depression at the interradial spaces; the rays not 
so distinctly lobed as usual in this genus; plates flat, and devoid of orna- 
mentation or other markings. 
Basals small, forming an obconical cup, rounded at the lower end; the 
column facet narrow, occupying the full width of the lower face. Radials 
a little wider than long, fully twice as wide as both costals together, the 
upper face concave. First costals quadrangular, as wide again as long. 
Second costals wider than the first, generally quadrangular, exceptionally 
hexangular or heptangular. They support in the anterior and posterior 
rays an axillary distichal, and this, in turn, a small palmar from each side; 
while the antero-lateral rays have two distichals and no palmars. Inter- 
brachials one and two; the first large, as wide as long, the ‘two others as 
long but one half narrower. Anal side very wide, a little bulging at the 
arm regions, incurving above, and elevated at the median line. It consists 
of three hexagonal anal plates, the first as large as the radials but somewhat 
longer and narrower; the other two decrease in size upward, and are fol- 
lowed by a number of smaller plates arranged around the anus. The.anals 
from the second plate up sustain at each side an interbrachial, the lower 
pair of which being nearly as large as the corresponding single plate of 
the regular sides, the upper ones being much smaller. Ventral disk de- 
pressed-convex, somewhat inflated along the sides, flattened on top. The 
surface 1s covered with six spines, which are short, coming rapidly to a point. 
The middle spine occupies nearly the centre of the upper face, the lateral 
ones are placed almost vertically to the arm bases. Arrangement of orals 
and radial plates as in the preceding species. Anus at midway between the 
posterior oral and the base of the arms, directed laterally. 
