BLASTOIDEA. 



313 



blastus E. and C., Carboniferous Limestone. Cadaster McCoy, Silurian to 

 Carboniferous. Phaenoschisma E. and C., Devonian, Carboniferous. 

 Orophocrinus v. Seebach, Carboniferous. Eleutherocrinus Shum. and 

 Yand., Devonian. Astrocrinus Austin, Carboniferous Limestone. 



FIG. 227. Thecas of typical Blastoids (after Bather). 1 Pentremites robustm. 2 Tricoelo- 

 crinus woodmani. 3 and 4 Orbitremites (Granatocrinus) orbicularis from the side and from 

 All nat. size. 



