F. B. Meek on new Silurian Crinoids and Sheils. 297 
Recumbent arms short, or confined mainly to the upper side, 
one extending down nearly to the opening on the anal side, another 
to the two rhombs to the right of the opening, a third to that 
on the left, and the fourth to the anterior side, the direction of all 
being thus nearly or quite at right angles to each other. Column 
thick at the base of the body, but tapering rapidly below; as usual, 
Cc y 
composed of very thin pieces. Surface of body plates marked b 
e 
Shell ovate, rather compressed or only moderately convex, the 
greatest convexity being a little above and slightly in advance of 
the middle, extremities more or less 
beaks only moderately prominent, somewhat obtuse, and not very 
convex, & fo more fice one-third the length of the valves from 
Le 
959 inch ; convexity, 0°30 to 33 inch. 
Am. Jour. Sc1.—Tuirp Series, VoL. II, No. 10.—Ocr., 1871. 
20 
