Report of U. S. Natonai Museum, 1901. 



Plate 65. 



* a 



THE BRACHIA AND PINNULES. 



The Biachia or arms in their simpl 



'•'.. colored blue . which continue s:r 



brachials may be in single or alternating do 



.. The inner surface of the bra* 



laden water to the mouth and for the so 



plates called amkulacrah • yellow i, which can 



The brachia are rarely single, usually 

 definite points. The pinna i (colored black is a b 

 but position from the small end-branches of a s 

 the pinnules are regularly placed on alternate 

 branch, the arm is said to be p'ntm/aU. To these 

 of the genital rachis. 



24,193. Scytalocrinua robustus. Lower Carbonic. Brachi 



34,087. PlMycrinus agassizi. Lower Carbonic- Brachia 



double, alternjting columns. 

 24,191. Cyathocrinus munibrachiatus. Lower Carbonic. 

 24,155. Barycrinus hercules. Lower Carbonic. Pmnulale 



acral plates. 



rm consist of a series of ossicles called 

 1 v : - - 1 '-"-'■ 1 colored red.. The 



"ows, and hence are spoken of as - 

 re grooved for the transmission of food 

 ts; and these are protected by covering 

 or close as occasion demands, 

 :ating in a regular or irregular manner at 

 rachium in miniature; it differs in nothing 

 mple dichotomous arm. However, when 

 sides of successive brachials of the main 

 pinnules are restricted the fertile portions 



1 pinnulate with regular bifurcations. Brachials m 



pinnulate with regular bifurcations. Brachials in 



Brachia dichotomous, without pinnules. 



brachia showing the ambulacral groove and ambul* 



Crinoid Series— the Brachia and Pinnules. 



