244 S. Lyon and 8. A. Casseday on new species of Crinoidea. 
Third radials, five, generally wos 2 hexagonal, thick, tuberculated, 
axillary, and support each two brachials. In three of the rays they are 
axillary, and support on each facet one or two pieces, from which proceed 
th rms, eac thus supporting four arms. In the two remaining 
jeces 
of these fields become olen? smaller, and are less regular in their 
form and disposition. All of these as well as the other pieces forming 
men; presenting much the same character as the interradials just men- 
tioned. The one resting on the base is can in size to the first radials 
which it resembles, this is succeeded by three large Fcxaded pieces, 
nearly in a line with the second radials, the remainder are smaller and 
ste dispo 
Interbrachials, Between the brachials, and in a Jine with the radials, 
are interbrachial pieces, one large and two smaller pieces. In the second 
bifurcation, in those rays having four arms, and — the last brachials, 
there is generally one other interbrachial inter |, sometimes two oF 
ree, arms are —— in number running off in pe pairs of two, 
and three om of ‘fou 
ault, The vmilic’ is covered by small ee Ss _ arranged in 
clusters of seven to ten about a central one, which is usually larger than 
the surrounding pi eces, and nail spinigerous. With the ese 8 of 
the spines, the vault is devoid of ornament. The pieces are rai n the 
centre giving this part a varicose appearance. roboscis is ee sub- 
central, com i similar to those of the vault; at or the 
base of it is a spine which i is nearly central, or somewhat larger than any 
other spine upon the summit. 
Geological position and ‘locality, This magnificent crinoid is found in 
considerable numbers in rocks of the Devonian period, a few feet beneath 
the black slate, at the quarries on Bear Creek near Louisville, Ky. 
We have referred this fossil to the genu s megistocrinus, which it resembles 
so closely in the number and arrangement of the pieces that > ane dispo- 
sition of it will hardly | 4 found in the ae rocks 
egis tocrinus latus. 
foil closely allied to this j is found in the Devonian rodks of Spain, and 
by De Verneuil as Pradocrinus Baylii,* a second species P. 
Americanus, is found on the Falls of the Ohio. 
* Bulletin de la Geol. Soc. de France, 2d Series, t. vii, p. 187, pl. 2, fig. 11. 
