408 The Calceocrbiidce. 



PL. xr. 



DIAGRAMS ILLUSTRATING STRUCTURE OF THE CALCEOCRINID^. 



Fig. 1. Castocrinus Ringueberg. 



Fig. 2. Proclivoerinus Ringueberg. 



Fig. 3. Calceocrinus Hall (revised by Ringueberg). 



a. Right side. b. Anterior side. c. Posterior side. d. Analysis of 



calyx. 

 Letters referring to analysis (cZ) :—b, hasals; r, radials; br, brachials; 



ax, axillary; an, anals; az, azygous. 

 The posterior side of the calyx down and the anterior side up. 

 Fig. 4. Section of Proclivoerinus, illustrating the articulation of the 

 base with the calyx and the manner of erection. 



c, column ; cb, consolidated basal piece ; ca, calyx; Z, elastic liga- 

 ment; int, integument covering ligament; m, probable situation of 

 muscles which held the calyx down. 



