MONOGRAPH OF THE EXISTING CRINOIDS. 



139 



In Balanometra of the Zenometrinse and in flypalometra (fig. 297, p. 221) 

 of the Perometrinse Pj and P are absent. In both these genera the arm bases 



204 



TIG. UG4. LATERAL VIEW OF ESPECIALLY WELL-DEVELOPED SPECIMEN OF PTILOMETRA MtLLERi FROM SYDNEY, 



NEW SOUTH WALES. 



are very closely pressed against each other. In the outer arms arising from IIIBr 

 axillaries in Cyllometra P, and P a are absent, as also on the inner arms in 

 Epi/netra. Both of these genera belong to the Colobometridfe. 



