Plate 148. 

 1, 2. Hypselaster rotundus (A. Ag. & CI.). X 2. 



1. Apical system. 



2. Peristomial region. 



:->, 4. Hypselaster brachypetalus H. L. Clark. X 4. 



3. Apical system. 

 I. Peristomial region. 



5-8. Hypselaster fragilis (A. Ag. & CI.). X 4. 



."). Posterior view of holotype (St. 4913). 



(i. Right-side view of same. 



7. Abactinal view of same. 



8. Aetinal view of same. 



