296 THE MEDALS OF CREATION. Cuap. VIII, 
forated joints, articulating by radiated surfaces ; pentagonal — 
near the summit. The re- 
ceptacle is composed of five 
pieces, succeeded by two suc- — 
} cessive series of five plates, 
i, With intervening plates, and — 
i supports five bifurcating, radi- 
li ated arms. 
The Encrinites of this genus — 
i have a light and elegant ap- 
M pearance : the forms of the 
| plates composing the pelvis, 
and of the ossicula of the 
| arms, are shown in Lign. 92, 
ill 7ig. 2; which represents a spe- 
i] cimen of C. planus, from the 
| magnesianlimestone of Somer- 
| sctshire ; a beautiful example 
| of the same species is figured 
in Lign. 95. The receptacle 
resembles in shape a depressed 
vase ; its upper part was pro- 
bably covered by a plated in- 
tegument, having an aperture 
in the centre as in the Actinocrinites. - Cyathocrinites occur 
in the Silurian, Devonian, and Carboniferous formations.* 
Lien. 95. 
CYATHOCRINITES PLANUS; nat. 
Mountain Limestone, Clevedon, 
* A figure of Cyathocrinus rugosus is given in Pict. Atlas, pl. xlix. 
fig. 4. The same work contains coloured figures of Pentacrinus sca- 
jaris (Goldfuss), pl. xlvii. figs. 57, 64, 66; Pentacrinus basaltiformis, 
pl. xlvii. fig. 47. 
A remarkable receptacle, with the tentacula partially introverted, 
is figured Pict. Atlas, pl. xlvi. fig. 2, from Gloucestershire ; and several 
beautiful examples of the arms, tentacula, &c. of Pentacrinites in Lias 
limestone and shale, in pl. li. figs. 9, 15, 16, and pl. lii. figs. 1, 2, 3, from 
Charmouth, 
