— Grinnell—a new Cretaceous Crinoid. 83 
Above these are four others in pairs, and these are followed by 
the smaller ones in fours, becoming rapidly less in size, as in the 
interradial arm. 
| he specimens are found in a soft light-colored limestone, 
and a considerable mass of the rock is often made up of their 
remains, as shown in the accompanying plate, figure 2, indica- 
ting that the individuals of this species lived together in large 
numbers. To this fact the specific name refers. It is needless 
to remark at length on the great interest which attaches to this 
species, the first crinoid known from the Cretaceous of the new 
world. The fact that it lacks a stem, thus resembling the genus 
Marsupites from the English chalk, suggests the advance made 
by some of the Crinoids that survived until the Cretaceous, 
tains during the autumn of 1870. It was found associated 
