?^^ 



THE 



Journal of Comparative Neurology. 



Page. 



Volume X — Number i. 



THE SENSE-ORGANS OF NEREIS VIRENS, SARSJ 

 By Fanny E. Langdon. 



With Plates I to III. 

 TABLE OF CONTENTS. 



I. Introduction, ...... 



II. Methods, . ...... 3 



III. External Appear.'vnce of Nereis virens, . . ,7 



IV. The Diffuse Sense-organs, ..... 8 



A. Structure, . . . . . . . 9 



(a) In the Body Epidermis, .... 9 



(b) In the Appendages, . . . . • ^5 



B. Study of the Living Diffuse Sense-organs, . . 24 



C. Course of the Central Processes to the Central Nervous 



System, ...... 27 



D. Ultimate Endings of the Central Processes, . . 30 



E. Distribution, ...... -^-^ 



F. Function, ....... 35 



G. Summary of the Literature, .... 37 



V. The Spiral Organs, ..... 44 



A. Structure. . '. . . . . .45 



B. Distribution, ...... 52 



C. Function, ....... 54 



VI. The Paired Cephalic Sense-organs, ... 60 



VII. Epidermal Anchoring Cells, ..... 65 



VIII. Summary, ....... 69 



1 Work from the Zoological Laboratory of the University of Michigan, Jj 

 cob Reighard, director. 



