VIII. Cyathocrinus. 221 



Cyathocrinus val/atus, sp. n. 

 (PI. XIII. figs. 14-18.) 



This species is based on three specinaens, viz. : — 

 In tlic British Museum : 



(a) E 6005, a soinewliat worn cup in matrix. Gray collec- 



tion. (PI. Xlir. %. 18.) 



(b) E 6006, a cup still more worn, especially in the distal 



region, and ground down at the sides ; in matrix; 

 seen from the right side. Gray collection. 

 (PI. XIII. fig. 15.) 



In the Museum of Mason College, Birmingham : 



(c) 170, a better preserved cup, showing articular facets for 



stem and arms; in matrix. (PI. XIII. figs. 14, 

 16, 17.) 



These specimens all come from the Wenlock Limestone of 

 Dudley, but the exact horizons and localities are uncertain. 

 They are all in a rather yellowish shale, on the top of a 

 limestone ; it is therefore probable that they come from the 

 Upper Wenlock Limestone. 



For permission to figure the specimens in the British 

 Museum I am indebted to Dr. Henry Woodward, F.R.S. ; 

 while for the loan of specimen c Prof. C. Lapworth deserves 

 my best thanks. 



The trivial name vallatus^ which means encircled by a 

 ,'idge^ refers to the characteristic ornament of the cup-plates. 



Specific Diagnosis, 



Dorsal cup rather elongate, with convexly rounded sides ; 

 plates plane, with a strong concentric ridge at a short distance 

 from the suture, and with irregular concentric or slightly 

 radiating ornament on the inner part. Axial canal not sepa- 

 rate. Stem with a large quinquelobate lumen. Arms, 

 ventral sac, tegmen, and stem unknown. 



Eemarks on the Species. 



Dorsal Cup has a somewhat ovoid curve, bulging more in 

 the region of the basals. Tlie measurements of the speci- 

 mens are as follows : — 



Aim. di Mag. X. Hist, Ser. 6. Vol. ix. 16 



