14 
b Fingers formed of two series of joints. If. Gen. Encatnrves, 
* Colamn round. 
© Alimentary canal round. 1 Sp. moniliformis. 
Corwwrrcrrcercrecrrtccrerereree 
Wi, Division. Semrarticuzata. Plate-like joints form- 
ing the superior cup-like body of the animal, arti- 
culating imperfectly to each other. 
A Pelvis formed of five joints 
‘A Supporting five costal plates. 
a Column not enlarging. 
a Fingers formed of a single series of joints. 
* Column round. 
o Alimentary canal round. 
§ Articulating surface of columnar joints 
radiated. 
+ Auxiliary side arms round. 
} Auxiliary side arms placedirregular. IV,GEN. Poreriocrinit£s, 
1 Joints of fingers thick. 1 Sp. crassus. 
2 Joints of fingers slender. 2 Sp. tenuis. 
Q1I. Division. INARTICULATA. Plates forming the su- 
perior cup-like body of the animal, adhering by 
sutures, lined by muscular integument. 
N. B. Ina young state PorersrocniINiTESs TENUSS may be erroneously 
considered as ‘belonging to this family, on account of the 
undeveloped state of the articulations. 
A Pelvis formed of five plates. 
& Supporting five costal plates. 
a Column not enlarged. 
a Fingers formed of a single series of joints. 
* Column round 
© Alimentary canal round. 
§ Articulating surface of columnar joints ra- 
diated. 
+ Auxiliary side arms round. 
t Auxiliary side arms placed irregular. VI. Gen. CyaTuocninites, 
