EXPLANATION OF TABLE B. 



THE PLATES OF THE RAYS IN DIFFERENT GENERA. 



1. Part of ray oi Marsupiocrinus ; costals, distichals, first and second palmars — of the latter only those of 



the two outer sides of the rays — abutting against the radials, 

 3, Scaphiocrinus. Arms uniserial ; pinnulated ; dichotomizing; the joints cuneate. 



3. Belemnocrinus typus. Arms uniserial, giving off armlets at intervals. 



4. A ray of Periechocrinus Whitfieldi. Arms biserial, branching in the free state. 



5. Proximal part of a ray of Steganocrinus sculptus. Arms biserial, given ofP alternately from opposite sides 



of tubular appendages. 



6. Proximal part of a ray of Qrotalocrinus pulcher ; the lower brachials arranged as in Pig. 1. 



7. Part of ray of Onychocrinus ramulosus. Arms uniserial ; the main branches giving off branchlets in 



clusters. 



8. Left section of a ray of Strotocrinus regalis. The arms given off from the proximal plate at alternate 



sides within the calyx. 



9. Symbathoerimis WachsmutU. Arms uniserial, composed exclusively of costals ; the joints arranged 



parallel. 

 The following symbols are used in the figures : R = radials ; I = primary brachials or costals ; II = 

 secondary brachials or distichals ; III = tertiary brachials or palmars ; IV == fourth order of brachials ; V = 

 fifth order of brachials ; and so on ; p. = pinnules ; a. = armlets. 



