CHAPTER XL 



THE CRINOIDEA. 1 



CLASS III. CRINOIDEA, MILLER (1821) 



( = CRINOIDEA BRACHIATA, Audi, veterum ; EUCRINOIDEA, Zittel, 



1879). 



SUB-CLASS 1. MONOCYCLICA. 



Order 1. Inadunata. 

 2. Adunata. 

 3. Camerata. 

 Sub-Order 1. Melocrinoidea. 



2. Batocrinoidea. 



3. Actinocrinoidea. 



SUB-CLASS 2. DICYCLICA. 



Order 1. Inadunata. 



Sub-Order 1. Cyathocrinoidea. 

 2. Dendrocrinoidea. 

 Order 2. Flexibilia. 



Grade 1. Impinnata. 



2. Pinnata. 

 3. Camerata. 



PELMATOZOA in which epithecal extensions of the food-grooves, 

 ambulacrals, superficial oral nervous system, blood-vascular and 

 water-vascular systems, coelom, and genital system are continued 

 exothecally upon jointed outgrowths of the abactinal thecal plates 

 (brachia), carrying with them extensions of the abactinal nerve- 

 system. The number of these processes is primitively and norm- 

 ally five, but may become less by atrophy. The brachia rise from 

 a corresponding number of thecal plates, " radials (RR)." Below 

 these is always a circlet, or traces of a circlet, of plates alternating 

 with the radials, i.e. interradial, and called " basals (BB)." Through 



1 By F. A. Bather, M.A. 



