INTRODUCTION. 
19 
mens and useful suggestions ; and to Professor Macbride, of Iowa, 
and Mr. Morgan, of Ohio, for a line series of the Mycetozoa from 
their respective districts ; also to Dr. Ilaviland for specimens of 
great interest from Borneo. Mr. Camm, of Smethwick, and Mr. 
Saunders, of Liiton, have supplied me with many scarce British 
species ; and to Mr. Phillips and Mr. Massee I am obliged for 
kindly entrusting me with their collections for examination. 
The Plates in this work are collotype reproductions of water- 
colour drawings made under the camera-lucida and reduced to 
half the originals ; the descriptions of the spore sculpture in the 
text must therefore be understood as giving the appearance when 
magnified 1200 diam., Zeiss y^th obj. 
I have further to mention that throughout my studies of the 
Mycetozoa, and in the preparation of the drawings illustrating 
this work, I have had the assistance of my daughter, Gulielma 
Lister. 
