iv 
In preparing this first part I have received very valuable 
assistance from Dr. Hartog, Demonstrator of Biology in the 
College, and from my friend and pupil Mr. C. H. Hurst. I am 
also much indebted to Prof. Gamgee and to Mr. Waters for the 
important help they have given me in the Histological portions. 
OWENS COLLEGE, 
August, 1882. 
PREFACE TO THE SECOND EDITION. 
In preparing the present edition I have again received valuable 
help from Mr. C. H. Hurst, Assistant Lecturer in Zoology 
in the College. 
The illustrations are, with the exception of figs. 1, 11, 12, 
and 14, original; and will, I hope, add to the usefulness 
of the book. They have been carefully selected in order to aid 
the student in his work without in any way replacing the 
drawings he must make from his own dissections. 
The second instalment of the work, containing directions for 
the examination and dissection of a number of animals chosen 
as types of the principal zoological groups, is in active prepara- 
tion, and will be published shortly. 
OwENS COLLEGE, 
July, 1885. 
