vin EGHINODERMATA SYSTEMATIC REVIEW 311 



with root-like processes at its base, or with irregularly arranged cirri ; its proximal 



P 



FIG. 257. Metacrinus Murray! (after P. H. Carpenter). Most of the arms and the larger part 

 of the stem broken off. p, Pinnulse ; ci, cirri : ii.gr, node. 



ossicle usually enlarged. Upper Jurassic, Chalk, Tertiary, Recent. Rhizocrinus, 

 Bourg ueticrinus. 



