1898-99.] Dr 0. Fuhrmann on Prosthecocotyle torulosa. 641 
On the Anatomy of Prosthecocotyle torulosa (Linstow) 
and Prosthecocotyle heteroclita (Dies.). By Dr O. 
Fuhrmann, University of Geneva. Communicated by Sir 
John Murray, K.C.B. (With a Plate.) 
(Read May 1, 1899.) 
In the Report on the Entozoa collected by H.M.S. “Challenger” 
Dr 0. von Linstow* described two new tapeworms, which he 
named Tetrabothrium torulosum and T. auriculatum. The resem- 
blance of the head of T. auriculatum with that of Prosthecocotyle 
Forsteri described by Monticelli f seemed to me to indicate that 
the Tetrabothrium described by Linstow probably belonged to the 
genus Prosthecocotyle. 
Through the kindness of Sir John Murray, I received from the 
British Museum the original specimens for inspection, for which I 
wish to express here my warmest thanks. The following lines 
give the results of my examination ; but before entering upon the 
description, let me say something on the systematic position of 
these two animals. As I have already remarked, Prof. Monticelli 
has rightly erected a new genus named Prosthecocotyle for the 
tapeworm Tcenia Forsteri , Krefft. To this genus belongs, besides 
P. Forsteri , other parasites of birds which have been placed in 
the genera Tcenia , Tetrabothrium , Amphoterocotyle , Bothridiotcenia , 
Bothriocephalus. According to my researches the following species 
belong to the genus Prosthecocotyle : — 
1. P. Forsteri (Krefft), (syn. Taenia Forsteri , Krefft), from 
Delphinus Forsteri (Gray) and Delphinus delphinus, L. 
2. P. Monticellii , Fuhrmann (syn. Tcenia erostris , ex parte , Both- 
* Linstow, 0. von, Report on the Entozoa collected by H.M.S. 
“ Challenger,” — Challenger Reports, Zoology, vol. xxiii., 1888, pi. ii. figs. 
16-20. 
t Monticelli, S., “ Nota intorno a due forme di Cestodi,” — Bull, dei Musei 
di Zoologia ed. Anat. comp, della R. Universita di Torina, vol. vii., 1892, 
figs. 4-13. 
eibiiA 
