266 THE OCEAN WORLD. 



of this stem are usually very numerous, cylindrical, and present a series 

 of rays striated upon their articulated faces. In Pentacrinus they are 



Fig. 107. Pentacrinus europseus (Thompson). 



prismatic and pentagonal; that is, they present five projecting angles, 

 and on their articulated face * *tar with five branches, or, better still, 



