WI CONTENTS OF VOL. XXXI. 
Suctoria. 
Page 
Pygiopsylla Robinsoni (Rothschild) /. By Dr. A. C. OupEmans. (With 
etext-figare) pe i. eas ee EN 
List of the Suctoria (Retzius 1783), (Aphaniptera Kirby & Spence 1823) 
in the Leyden Museum. By Dr. A. C. OUDEMANS. . . ... . 201. 
VERMES. 
Three overlooked Chrysopetalidae. By Dr. R. Horst. . . . . . . 170. 
Vol. XXXI was issued in parts in the following order. 
N°, 1. — 25 January 1909, Note I. 
N°. 2. — 6 April 1909, Note II—IV. 
N°, 3 and 4. — 20 December 1909, Note V—XVI. 
