MORPHOLOGICAL STUDIES. 
153 
Morphological Studies. 
II.— The Development of the Peripheral Nervous 
System of Vertebrates. 
Part I. — ELASMOBRANCHII AND AVES. 
By 
«V. Beard, Pli.D., B.Sc., 
Assistant to the Professor of Human and Comparative Anatomy 
in the University of Freiburg i/B. 
With Plates XVI, XVII, XVIII, XIX, XX, XXI. 
TABLE OF CONTENTS. 
Introduction (pp. 155 — 163). 
I. The Peripheral Nervous System of Elasmobranchii. 
a. The Spinal Ganglia. — The Zwischenstrang of His. The neural 
ridge of Marshall. Julin’s views of the morphology of the lateral nerve. 
The permanent and only root of attachment. Mode of growth of the 
connecting fibres. The trophic properties of the ganglia as evidence 
(pp. 161—173). 
b. The Cranial Ganglia of Elasmobranchii. — The neural 
ganglia. The lateral ganglia and sense organs. The origin of the nerves 
of the sense organs. The formation of the permanent root of the nerve. 
Tlie visceral motor fibres of the head (pp. 173 — 181). 
II. The Peripheral Nervous System of the Chick. 
a. The Spinal Ganglia. — The Zwischenstrang of His (pp. 183 — 185). 
b. The Cranial Ganglia in the Chick. — Marshall’s conclusions. 
His’s results and the “ Zwischenrinne.” Ouodi’s researches, c. The 
neural ganglia. d. The rudimentary sense organs and their ganglia 
(pp. 186—192). 
