Glyptocrinus Redefined and Restricted, etc. 231 
bears twenty-four arms. The first interradial rests upon the superior 
side of a subradial, and it is followed by plates that are not disposed 
in transverse ranges. There are as many as twenty interradials be- 
low the top of the second secondary radial, from which point the calyx 
seems to rapidly contract, leaving a very narrow vault. The vault is 
not known, but indications are that it is not materially different from 
that of G. nealli. The arms are composed of cuneiform plates. They 
are large and long, and bear strong pinnules which are separated, 
showing that the ambulacral grooves are covered with plates between 
the pinnules. ; 
The calyx is strongly pentagonal, because of the prominence of the 
radial ridges. The sculpturing, if it had any, is not preserved in our 
specimens, and hence the surface markings of the plates are unknown. 
It occurs in the upper part of the Hudson River Group, in Warren 
county, Ohio. The type of the species is from the collection of J.- 
Kelly O’Neall, of Lebanon, Ohio, but Dr. D. T. D. Dyche, of the same 
place, has specimens also in his collection. 
PYCNOCRINDS, n. gen. 
[Ety.—Puknos, thick, from the dense pinnules; krinon, a lily.] 
This genus is established to receive those species referred to Glypto- 
erinus, which do not possess any secondary radials. It may be defined 
as follows : 
Calyx small, cup-shaped. Column round. Basals five, small, pen- 
tagonal, Primary radials three by five. Secondary radials, none. Regu- 
lar interradials three. Arms ten, but sometimes dividing after becom- 
ing free. Pinnules dense and strong. 
Type Pycnocrinus shaffert. 
PYCNOCRINUS SHAFFERI (S. A. Miller). 
Column round, composed near the head of alternately thinner and 
thicker plates, but lower down, three, four or more thinner plates, in- 
tervene between the thicker projecting ones, presenting the appearance 
of a string of little spools, and finally the column terminates in a point, 
The lower end is sometimes found wrapped around another object, in- 
dicating that it was used in this manner, for the purpose of attach- 
ment. ‘ 
Calyx small, cup-shaped, having an indistinct pentagonal outline, 
caused by a slight convex swelling of the radial series. Basals small, 
