392 



Mr. F. A. Bather on 



post. B; transverse greatest diameter 5*7 mm. on basiradial 

 suture ; transverse diameter at level of radial facets 4/3 mm. 

 Stem-facet (text-fig. 3) slightly concave, with no rim ; 

 elliptical or subpentagonal, being elongate from 1. post, radius 

 to r. ant. 1R, and extended on the small IB, i. e. along 

 r, post, radius ; at the margin faint traces of crenellaj, 

 approximately 15 in all; lumen minute, circular so far as 

 can be observed. Lon<>- diameter of facet ca. 1"G mm. 



Fijy. 1. 



Fi$y. 2. 



Fisr. 3. 



Fiji'. 4. 



Cydonocrinus parvulus, the Ilolotype. 



Fig. 1. — Posterior view. 



Fig. 2. — Views from above, with the posterior basal towards the observer. 



Fig. 3. — View from below, with the posterior basal away from the 



observer. 

 Fig. 4. — View from the right side, with the probable anal structure and 



proximal parts of the arms dotted in. 



All the drawings by A. H. Searle, X 3 diam. 



Fig. 5. 



Q ©Q00 



u O^ O r -p- ™O a 



Cydonocrinus parvulus. Analysis of the cup, the plates being drawn as 

 accurately as their curvature permits, x 3 diam. 



IBB. Greatest height ca. 1*5 mm. ; height from basal 

 plane ca. 1 mm. ; plates slightly tumid and sutures distinct 

 where not weathered. 



BB. Height of r. ant. (pentagonal) 32 mm. ; of 1. ant. 

 (hexagonal) 3*5 mm. ; of post, (heptagonal) 4 '5 mm. 

 Width of normal BB, greatest above, ca. 3*3 mm. ; of 



