THE MUSHROOM BODIES OF THE CRAYFISH AND 
THEIR HISTOLOGICAL ENVIRONMENT. 
A Stupy IN CoMPARATIVE NEUROLOGY. 
By ‘C) H.: TURNER; 
Professor of Biology in Clark University, Atlanta, Ga. 
With Plates XXI—XXIY. 
TABLE OF CONTENTS. 
INTRODUCTION 
HisTORICAL RESUME 
Emil Yung 
W. Vignal 
K. Richard Krieger 
G. Retzius 
Jules Richard 
Paul Samassa 
H. Viallanes 
C. H. Turner 
Edgar J. Allen 
Edwin S. Goodrich 
J. J. Hamaker 
MATERIAL ; 
METHODS 
GENERAL TOPOGRAPHY . 
CEREBRAL NERVES OF THE CRAYFISH 
Optic Nerve 
Oculomotor Nerve 
Antennulary Nerve 
Tegumentary Nerve 
Antennary Nerve 
CRANIAL NERVES OF DECAPODS (esieparative Table) 
CELL NIDI 
Dorsal Niduet 
Outer and Inner Naseem Nidi 
Latero-ventral Nidus 2 : : 2 : 
Ventral Nidus “ : : - : . 
