Volume XVIII. April, igoj. Nos. i and 2, 



JOURNAL 



OF 



MORPHOLOGY. 



ON THE HABITS AND STRUCTURE OF COTYLASPIS 



INSIGNIS LEIDY, FROM LAKE CHAUTAUQUA, 



NEW YORK. 



HENRY LESLIE OSBORN, 

 Saint Paul, ^Minnesota. 



TABLE OF CONTENTS. 



a. Introduction I 



h. Distribution 3 



c. Habits 7 



d. External anatomy ; 9 



e. The Cuticle 12 



f. The ^lusculature 12 



g. The Parenchyma 14 



h. The Alimentary System 15 



i. The Excretory System 17 



k. The Nervous System 21 



/. The ^larginal Organs 24 



m. The Reproductive System 26 



J. general statement 26 



a. the male organs 27 



in. the female organs 31 



a. Introduction. 



The genus Cotylaspis was founded in 1857 by Dr. Joseph 

 Leidy, of Philadelphia, for the reception of a fluke worm which 



