PLATE XXIV. 



Pyrina Pakuyi Hall (page 59). 



Fig. la. Upper surface of the test. • • 

 lb. Lower surface of the same. 

 Ic. Side view of the same. 

 Id. Posterior view of the siime. 

 If. Portion of an ambulacral area, enlarged. 

 1/'. The same further enlarged. 



l(f. Two interambulacral plates, magnitied three diameters. 

 l/(. Portion of single interambulacral plate, highly magnitied. 

 li. Apical disk, enlarged. 



Ifc. Portion of the madreporite, highly magnitied. 

 152 



