TABLE OF CONTENTS. === 



ARTICLE I. Introduction. Pp. 16. 



Advertisement ........ 



List of Officers of the Smithsonian Institution .... 



Table of Contents ....... 



ARTICLE n. A Flora and Fauna within Living Anim.vls. By Joseph Leidy, M. D 

 Pp. 6<S, and ten plates. 

 Introduction . . . . , . 



Chapter I. Description of a Flora within Animals . 

 Chapter II. A Fauna within Animals; being descriptions of Nematoid Entozoa 



found associated with Entophjta, and others allied to them 

 Chapter III. Upon Pseudo Entophyta, &c. . 



Index of Scientific Names .... 



Explanation of the Plates and Figures ... 



ARTICLE in. Memoir upon the Extinct Species of Fossil Ox. By Joseph Leidy, M. D 

 Pp. 20, and five plates. 

 Introduction ........ 



Chapter I. General Remarks . ... 



Chapter II. Description of Extinct Species of American Oxen 

 References to the Plates ...... 



Ill 



ix 



siii 



5 

 17 



41 

 50 

 5.5 



57 



o 



5 



8 

 19 



ARTICLE IV. Anatomy of the Nervous System of Rana Pipiens. By Jeffries Wyman, 

 M. D. Pp. 52, and two plates. 

 Introduction ......... 5 



Section I. The Brain ....... 7 



Section II. Internal Structure of the Brain . . .14 



* Each article is paged separately, and on the inside of cacli page is placed, in Roman character, the number of the 

 article to which it belongs. 



