190 Mr. F. A. Bather on British Fossil Crinoids : 



This species is founded on two specimens in tlie Wood- 

 wardian Museum, Cambridge : — 



0/435. Upper Wenlock Limestone, Dudley. Fletcher Coll. 

 (PI. XL tigs. 1 and 2). 



For permission to figure and describe these specimens I am 

 indebted to Prof. T. M'Kennj Hughes, F.R.S. 



Specific Diagnosis. 



Cup elegant, widening above. RR projecting very 

 slightly; facet about | their width. Arms about seven times 

 length of cup, two-branclied, with small armlets. (Anal 

 structures unknown.) Stem comparatively stout and 

 markedly quinquelobate, with alternate-sized ossicles. 



Description of the Specimens. 



The two specimens are figured on PI. XL, Xo. 1 being the 

 large specimen and Xo. 2 the small. They are both seen 

 from the anterior, and show no trace of anals or of the ventral 

 sac. 



Dorsal cup. — In both the plates are a little disturbed and 

 the cup is flattened, so that measurements of its height and 

 width are liable to correction. They are as follows : — 



Heifrht. Width below. "Width above. 



millim. millim. millim. 



No. 1 8-0 ? 



No. 2 Q-26 3 11-5 (squashed) 



The plates of the cup are smooth, and there is no trace of 

 axial folding. 



IBB 5, pentagonal, forming a very slight angle with the 

 stem. Measurements are : — 



Height. Width below. "Width above. 



millim. millim. millim. 



No. 1 2-4 2-8 3-a 



No. 2 2 1-5 2 



BB 5, hexagonal ; post.B not seen. Measurements 

 are : — 



Height. Width below. "Width above. 



millim. millim. millim. 



No. 1 4 .3-9 4-8 



No. 2 3 3 3-5 



