PoTERiocRiNiTEs. RADIATA. CRINOIDiE. 495 
5. P. Brlaereus. — Auxiliary side-arms angular, in a single series ; column 
smooth. Mill. Crin. 56. — In Lias. 
Gen. POTERIOCRINITES. — Pelvis of five joints, with five 
costals ; fingers of a single series of joints ; column not en- 
larging, round ; central canal round ; articulating surface 
of the joints radiated ; auxiliary side-arms round. 
1. P. crassus Joints of the fingers thick ; plates of the pelvis articulating 
by transverse ridge-like processes. — Mill. Crin. 68. — Carboniferous Limestone. 
2. P. tenuis Joints of the fingers slender ; plates articulating by minute 
striae. Mill. Crin. 71* — Carboniferous Limestone. 
Gen. CYATHOCRINITES. — Pelvis of five plates, with five 
costals ; the fingers of a single series of joints ; column not 
enlarged ; articulating surface of the columnar joints radia- 
ted ; auxiliary side-arms round, and placed irregularly. 
1. C. ‘planus . — Column and central canal round ; plates smooth. — Mill. Crin. 
85. — In Carboniferous Limestone. 
2. C. tuberculatus. — Column and central canal round ; costal plates tuber- 
culated. — Mill. Crin. ^^.-‘-Carboniferous Limestone. 
3. C. rugosus — Column round ; central canal petal-shaped ; costal plates 
with angular rugged stxvdd.--Mill. Crin. 89. — Cg,rboniferous Limestone. 
4. C. quinquangularis — Column and central canal pentangular ; costal plates 
smooth. — Mill. Crin. 92.— Carboniferous Limestone. 
Gen. ACTINOCRINITES. — Pelvis formed of three plates, 
with five costals and one intercostal ; fingers of two series of 
joints ; column and canal round, the articulating surfaces 
radiated ; auxiliary side-arms round and irregular. 
1. A. triacontada<:tylus.—llh\xty fingers proceeding from five scapulae.-— 
Crin. 95. — Carboniferous Limestone. 
2. Polydactylus — More than thirty fingers proceeding from five scapulae.*— 
Mill. Crin. 10'^.— Carboniferous Limestone. v 
Gen. RHODOCRINITES. — Pelvis of three plates, with five 
costals and five intercostals ; fingers of two series of joints ; 
column not enlarging, round, the canal petal-shaped. 
- 1. R. verMs.— Auxiliary side-arms round and irregular**— M*//. Crin. 106.— 
Carboniferous Limestone. 
