1898 — 99 .] Dr 0. Fuhrmann on Prosthecocotyle tornlosa. 643 
The germs Prosthecocotyle may he characterised as follows — 
The head, without rostellum and hooks, has a quadrangular shape, 
which is caused by the singular structure of the suckers. Each 
sucker shows the peculiarity of having on the outmost end a 
lateral protrusion, which has the same histological structure as 
the oval and powerful suckers themselves. The segmentation 
begins not very far behind the head, and the segments are 
always shorter than broad, except the last segments on the 
posterior end. The morphology of the genital organs also shows 
some typical characters. Male Organs. — The cirrus-pouch is 
always small, and has a globular shape. It lies at some distance 
from the margin, and is joined with the genital cloaca by a canal 
which I call ‘ male cloacal canal.’ It is rarely armed. The vas 
deferens is very long and without vesicula semin alis. The 
testicles, to the number of 8 to 60 in each segment, are confined 
to the dorsal portion of the median field. Female Organs . — The 
small vitelligenous gland lies always before the great ovary. 
The vagina passes directly from the ventral side of the cirrus to 
the ovary, showing a receptaculum seminis varying in form and 
structure in the different species. The genital cloaca is always on 
the left margin of the strobila; it is very deep and possesses a 
very complicated musculature. The eggs are enveloped by three 
shells. 
Prosthecocotyle torulosa (Linstow). ( Tetrabothrium torulosum, 
Linstow.) Eigs. 1-3. 
This Taenia was found in Diomedea brachyura. The length is, 
according to 0. von Linstow, 175 mm. The width behind the 
head is 1 mm., from there increasing gradually, and 9 cm. behind 
the scolex it attains 5 mm., which is the maximum width. The 
segmentation of the body begins immediately behind the head, 
but the segments are at first very short (O022 mm.). The 
segments, with the genital glands well developed, are very 
thick; they are 0T26 mm. long by 5 mm. wide, and have a 
vertical diameter of about 2 mm. The measurements are almost 
the same for the segments crowded with eggs. The posterior 
border of each segment overlaps— with a prominent fold — the 
