367 
THE LIFE-CYCLE OF HERPETOMONAS JAGULUM (LEGER), 
PARASITIC IN THE ALIMENTARY TRACT OF NEPA 
CINEREA. 
By ANNIE PORTER, B.Sc. Bond. 
University College, London. 
(With Plate V and 1 
Text-figure.) 
CONTENTS. 
PAGE 
Introduction ..... 
367 
Material and Methods 
368 
General Description .... 
369 
Movements ...... 
370 
Morphology:. 
371 
The Pre-flagellate Stage 
372 
The Flagellate Stage 
372 
The Post-flagellate Stage 
375 
Division ...... 
376 
Sexuality ...... 
378 
Mode of Infection .... 
380 
The Evolution of Hereditary Infection 
381 
Environmental Effects 
381 
General Remarks .... 
382 
Summary ...... 
386 
References ...... 
388 
Explanation of Plate .... 
389 
Introduction. 
Among the flagellates to which much attention has been directed 
recently, the genera Trypanosoma, Critliidia and Herpetomonas are 
prominent, on account not only of their intrinsic interest, but because of 
the connexion of various members of these genera with well-known 
diseases, some of which may affect man. The genus Herpetomonas, with 
