WORMS. 4il 
peculiarity in the bothriocephalus consists in the shape of the head 
(see fig. 4), which has two lateral longitudinal grooves (bothria), 
while that of the true tenia is hemispherical. The following is a 
description according to Professor Owen :—“‘ The Zeenia solium 
attains the length of several feet, extending sometimes from the 
mouth to the anus. The breadth varies from one-fourth of a line 
at its anterior part to three or four lines towards the posterior part 
of the body, which then again diminishes. The head (jig. 3, a) is 
small, and generally hemispherical, broader than long, and often 
as if truncated anteriorly ; the four mouths, or oscula, are situated 
on the anterior surface, and surround the central rostellum, which 
is very short, terminated by a minute apical papilla, and surrounded 
by a double circle of small recurved hooks. The segments of the 
neck, or anterior part of the body, are represented by transverse 
tuge, the marginal angles of which scarcely project beyond 
the lateral line; the succeeding segments are subquadrate, their 
length scarcely exceeding their breadth; they then become 
sensibly longer, narrower anteriorly, thicker and broader at the 
posterior margin, which slightly overlaps the succeeding joint. 
The last series of segments are sometimes twice or three times 
as long as they are broad. ‘The generative orifices (b 6) are placed 
near the middle of one of the margins of each joint, and are gene- 
rally alternate (jig. 5,¢d@). The Tenia solium is androgynous ; that 
is to say, it produces its ova without the necessity for the contact 
of two individuals, the male and female organs being contained in 
each.” Professor Owen thus describes them—‘In each joint of 
this worm there is a large branched ovarium (jig. 5, ), from which 
a duct (h) is continued to the lateral opening; the ova are crowded 
in the ovary, and in those situated on the posterior segments of 
the body they generally present a brownish colour, which renders 
the form of their receptacle sufficiently conspicuous. In segments 
which have been expelled separately we have observed the ovary 
to be nearly empty; and it is in these that the male duct and 
gland are most easily perceived. For this purpose, it is only 
necessary to place the segment between two slips of glass, and 
view it by means of a simple lens magnifying from. 20 to 30 
diameters. A well-defined line (g), more slender and opaque than 
the oviduct, may then be traced, extending from the termination 
