PLATE V. 

 Plumaster ophiuroides, Wright. 

 From the Middle Lias. 



(t. Plumaster ophiuroides, Wright, p. 112. Ventral surface, natural size. 



t). Ambulacral and inter-ambulacral ossicula, magnified ; the long inter-ambulacral plates 



with pectinated distal borders supporting rows of spiniferous tubercles, 

 e. A pair of large angle-plates with tubercles on their surface, magnified. 



LuiDiA MuRCHisoNi, WiUicimon. 

 From the Middle Lias. 



LuiDiA MuRCHisoNi, WHliamson, p. 111. Ventral surface, natural size. 



