13 
Systematic Arrangement of the Crinotdea, 


* The &tymology of the names adopted will be found in the description of each genus and species, 

I. Diviston. ARTICULATA. Joints forming the supe- 
rior cup-like body of the animal articulating to 
each other. 
A Pelvis formed of five joints. 
‘A Supporting five costal joints. 
a Column enlarging at the summit. / 
a Fingers formed of a single series of joints. Y. Gen. APIOCRINITES.. 
* Column round 


o Alimentary-canal round. 
S Articulating surface of columnar joints radiated. 1 Sp. rotundus. 
3* Column elliptic. i 
ro Alimentary canal round. 
§§ Articulating surface of columnar joints trans- 
; owersely ridged. 2 Sp. ellipticus. 
» Column not enlarging at the summit. 
a Fingers formed of a single series of joints. 
፳ሯቾ Column pentangular. ። 
o Alimentary canal-round. 
$$$ Articulating surface of columnar joints petal- 
shaped. ۳ Jil GEN. PENTACRINITES. 
+ Auxiliary side arms round. 
t In single series. 
|| Column smooth. 
1 Columnarjoints generally alternately 




smaller and larger. 4 1 Sp. Caput Meduse. 
2 Columnar joints generally.of more i 
uniform thickness. 4 Sp. Basaltiformis. 
‘|| || Column tuberculated. . 5 Sp. tuberculatus. 
$i Auxiliary side arms in double series. 
‘|| Column smooth. ١ 3 Sp. subangularis, 
++ Auxiliary side arms angular. 
+ Auxiliary side arms in single series. ۱ 
‘|| Column smooth. 2 Sp. Briareus. 




