k 
: 
FOSSIL CRINOIDEA. 287 
lying in relief, and a polished section showing the inclosed 
entrochites, are figured Wond. p. 650.* 
The receptacle which contained the viscera is extremely 
diversified in form, and in the number, shape, and arrange- 
ment of its plates: the annexed figure 2, Lign. 92, illus- 
trates the several pieces that enter into its composition. 
The genera, or subgenera, are based on the modifications of 
shape and structure of the receptacle ; and their names are 
composed of the termination crinus, or crinites (signifying 
stone-lily), with a term prefixed expressive of the generic 
character: thus we have Apiocrinus, or Apiocrinites, Pear 
Encrinite.t 
The receptacle being round and inflated, and composed of 
pieces articulated with the stems, and supporting the arms by 
similar articulations, are the generic characters of Apiocri- 
nites of Miller. When round but not inflated—Hncrinus, 
when pentagonal, Pentacrinus. When the receptacle is 
composed of angular plates united at the edges and forming 
several series or stages, it constitutes the basis of the following 
genera : v1z.— 
Platycrinus ; two series, the one of three, the other of five 
plates. 
Pateriocrinus ; three series each of five plates. 
Cyathocrinus ; three series of five plates, the last with five 
intercalated pieces. 
Actinocrinus ; several series of plates: the first composed 
of three, the second of five, and the others of many pieces. 
Rhodocrinus ; several series of plates that are covered 
externally with radiated ridges. The first course consists of 
* Upwards of 80 figures of Encrinital remains are given in Pict. 
Atlas, pl. xlvii. 
+ The termination crinus is now generally employed, instead of 
crinites ; the latter is preferable, as it indicates the fossil nature of the 
specimens. A more expressive name than Hncrinite was suggested by 
Mr. Martin, of Derbyshire; that of Stylastrite or Column-Stars. 
