55 



joints affected, is exhibited in one instance (PL. 11. fig. 10.) precisely in the same 

 manner as was before noticed jn the Apiocrinites rotundus. 



COLUMNAR FRAGMENTS, smaller and rather neater than those of the species 

 just described, occur in the oolite at Dundry, the forest marble at Chippenham, 

 and the chalk near Lyme. It remains to be ascertained by the acquisition of per- 

 fect specimens, whether these belong to a variety of P. Caput Medusae, or pos- 

 sess peculiar characters sufficient to distinguish them as a new species. 



