16 
* Colunm elliptic. 
o Alimentary canal round. 
§§ Articulating surface of columnar joints 
transversely ridged. 
+ Auxiliary side arms round. 
t Auxiliary side arms placed irregular, 
1 The five scapule smooth, having 
each four fingers. 1 Sp. levis. 
2 The five scapule rugose, having each 
six fingers. 2 Sp. rugosus. 
€** Column pentangular. 
ooo Alimentary canal pentangulare 
& Articulating surface of columnar joints ra- 
diated. 
+ Auxiliary side arms round, 
{ Auxiliary side arms irregular. 
1 The five scapule smooth 6 Sp. pentangularis. 
*** Column not known. 
1 The five scapule tuberculated. 3 Sp. tuberculatus. 
2 The five scapule granulated. 4 Sp. granulatus. 
3 The five scapule striated. 3 Sp. striatus. 
error eros rr eraser rrercerpoese ' 
TV. Division. Coapunata. The joints of the pelvis 
anchylose to the first columnar joint. 
A Pelvis formed of five joints. 
@ Column enlarged at the summit. IX, Gen. Eugentacrinites. 
o Alimentary canal round. 1 Sp. quingu angularis. 
