vin ECHINODERMATA SYSTEMATIC REVIEW 311 



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



P 



: 



-co 



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

 of the stem broken off. p, PimmUe ; ci, cirri : ng, node. 



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

 Jjouryiieticrinus. 



