AUTHOR S ABSTRACT OF THIS PAPER ISSUED 

 BT THE BIBLIOGRAPHIC SERVICE, JANUARY 19 



THE HYOBRANCHIAL APPARATUS OF SPELERPES 

 BISLINEATUS 



LOUISE SMITH 



Departmejit of Zoology, Smith College, Northampton, Massachtisetts 



FORTY-SEVEN FIGURES 



CONTENTS 



Introduction 527 



1 . Purpose and scope 527 



2. Material and technique 529 



Larval condition 530 



1. Hyobranchial skeleton 530 



2. Hyobranchial muscles 533 



Adult condition 536 



1. Hyobranchial skeleton 536 



2. Hyobranchial muscles 539 



Metamorphic phenomena 542 



1. Skeleton 542 



2. Muscles 545 



Conclusions 549 



INTRODUCTION 



1 . Purpose and scope 



The study of the hyobranchial apparatus of Spelerpes bis- 

 lineatus^ was undertaken in the hope that its results might prove 

 of some significance to the broader investigation which Mrs. I. 

 W. Wilder is carrying on in regard to the metamorphosis of this 

 animal. As the whole process of metamorphosis is a series of 

 adaptations to the transition from a wholly aquatic to a semi- 

 terrestrial life, and, as especially important adaptations come in 



' In their Checklist ('17) Stejneger and Barbour have replaced the generic 

 name Spelerpes by Eurycea, a Rafinesquian name. As Spelerpes has been uni- 

 versally accepted in morphological literature for nearly seventy years, there 

 seems to be no necessity for adopting the change here. 



527 



