Wachsmuth and Springer—Paleocrinoidea. 375 
radials. However, it is scarcely probable that the division of 
the plate actually took place; it is more likely that the right. 
upper corner of the azygous plate was gradually absorbed by the 
radial. This view is corroborated by the small size and pecul- 
the right posterior radial to be a fixed character. 
however, that in the Erras specimen this plate, exceptionally, 
Plates of the azygous side in the principal genera of the Cya- 
thocrinidse. 
q 2 oe , 
po 8 Be 
Re a cee cae 
ocrinus ; fig. 2, Hoplocrinus; fig. 3, Hybocrinus ; fig. 4, Jocrinus ; fig. 6, 
basals; a, azygous plate; 7, posterior ra , 
Plate of the pads) ‘ibe. more generally known as third anal plate. 
