ON THE STRUCTURE OF TWO FISH TAPEWORMS 



FROM THE GENUS PROTEOCEPHALUS 



WEINLAND 1858.1 



HARRIS M. BENEDICT. 



This paper consists of an anatomical and histological study 

 of a little-known native species of Proteocephaliis and an inves- 

 tigation of P. filicollis, a well-known species first described by 

 Rudolphi, in which some additional points are elucidated. 



The investigations were carried on in the years 1895-97, and 

 the paper has been accepted as the thesis for the Master's 

 degree at the University of Nebraska. 



To Dr. Ward my sincerest thanks are due, not only for the 

 material with which I worked and the use of his private library, 

 but also for the valuable assistance which in other ways he has 

 given me. I am also indebted to the kindness of Prof. Dr. 

 Zschokke, of Basel, in sending to Dr. Ward, specimens of 

 P. filicollis. 



In the study of the genus of fish taeniae, to which Lonnberg 

 {'94) has given the name Ichthyotaenia, the paper by Weinland 

 ('58) has evidently been overlooked. In this paper, which was 

 brought to my notice by Dr. Charles W. Stiles in private cor- 

 respondence, the following occurs : 



" Gen. 2. Proteocephaliis, Weinl. (The name is derived 

 from '7rp(OTev<;,' the ever-changing principle in the old Greek 

 mythology, and ' Ke(f)a\'^,' head.) The shape of the head of 

 this genus is extremely changeable. There is no proboscis nor 

 booklets. The eggs are provided with two shells, the outer 

 shell being mucilaginous. These taeniods live in reptiles and 

 fishes. The type of this genus is Taenia ambigiia Dujardin. 

 Here belong Taenia filicollis and Taenia dispar" 



1 Studies from the Zoological Laboratory, The University of Nebraska, under 

 the direction of Henry B. Ward, No. ^t,. 



337 



