es ets Te a 
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Mr. F. M‘Coy on some new Paleozoic Echinodermata. 247 
articulation for the arms, which are prominent, very large, 
broad, and two-thirds the depth of the plate ; interscapular 
plate large, hexagonal ; visceral plates rather small, hemisphe- 
rical. Height from pelvis to vertex 1 inch. 
The very wide, depressed, turban-like form of this species 
(which I find constant) easily distinguishes it from its congeners. 
All the plates are even and smooth. 
Not uncommon in the white decomposing encrinal beds of 
earboniferous limestone at Cleenish, co. Fermanagh, north of 
Treland. 
_ (Col. University of Cambridge and Royal Dublin Society.) 
Platycrinus megastylus (M‘Coy). 
Sp. Char. Body broad ovate, visceral portion convex, not much 
elevated ; cup rapidly expanding, conical; pelvis pentagonal, 
very small, resembling a prominent rim to the very large cir- 
cular columnar attachment, the diameter of which is three 
times greater than from its circumference to the edge of the 
pelvic plate ; scapule slightly convex, even, nearly twice as wide 
above as below, little wider than long ; excavations for the arm- 
plates large, nearly half the depth of the scapule ; capital plates 
variable in size and number, but large, few, unequal, polygonal, 
and most of them presenting a large conical protuberance in 
the centre ; entire surface smooth. Length of body 10 lines, 
width between the arms 9 lines. 
‘This species is excellently ficured by Prof. Phillips (Geol. 
Yorksh.) with a doubtful reference to the P. levis of Miller. The 
latter species is, I believe, generally admitted now to be distinct, 
but having examined specimens agreeing with the above ficure, 
I find the species to which it belongs differs both from that to 
which Goldfuss and that to which Mr. Austin have referred it, 
by the comparatively enormous size of the columnar attachment, 
and the narrow prominent rim to which the rest of the pelvic 
plate seems reduced. 
The specimens above described are from the carboniferous 
limestone of Bolland, where it occurs in company with numbers 
of the P. pileatus, Gold. (P. antheliontes, Aust.), which it much 
resembles, but from which it is easily distinguished by the above 
characters. 
(Col. University of Cambridge.) 
Actinocrinus (Amphoracrinus °) olla (M‘Coy). 
Sp. Char. Inversely pyriform, very gibbous ; arm-bases small, 
not very prominent ; cup below the arms hemispherical, visce- 
ral portion above very wide, elevated, cylindrical ; all the plates 
