TRANSLATIONS FROM CONTINENTAL JOURNALS. 
551 
the two lateral are round and longer than the middle, which 
has a longitudinal ridge in the centre; this bifurcates, giving 
off two branches, which also bifurcate. From the upper part 
of this central ridge arises on each side a curved ridge, which 
goes to the corresponding lobe, thus forming a semicircle with 
the opposite ridge. Independent of this, the lateral lobes are 
supported by four ridges, confluent to their base, but spreading 
as they separate. These three lobes constitute a membranous 
sack, which is transparent in every part, and on which the 
ridges do not exist. The same as in the majority of the 
nematoids, they have but one testicle, which is a very simple 
organ, being formed by a tube which takes its origin at about 
two thirds of the length of the body, and a little behind the 
head. At the beginning it is very small, doubles twice on 
itself, then ascends to the anterior third of the body, where it 
again doubles, and forms a convexity; afterwards descending to 
the origin of the tail. A little beyond this convexity it insen¬ 
sibly increases in size, until it acquires three or four times its 
ordinary diameter; thus increased, this testicular tube reaches 
the place where it started from, when it suddenly contracts 
and forms a narrow, short canal, which terminates in a large 
tube with thick parietes, formed by transverse, oblique fibres. 
This tube becomes also thinner as it progresses towards the 
extremity of the tail, where it is provided on its sides with 
two spiculae, which have the power of retracting within the 
body; they are very thin and slender, beginning each by a 
sort of hollow or cavity; they are from '60 mm. to ‘70 mm. in 
length. In the worms of the vessels and the heart of the dog, 
the males are from 14 mm. to 15mm. long; they have the 
tail reflected and obtuse, terminated by a membranous, short, 
obtuse, transparent wing, which has two lobes, each of which 
is supported bv four ridges or ribs; the external one is bifid, 
the second simple, the third bifid, and the last short and 
simple. There is also only one tesucle; this organ, which 
originates a little below the termination of the oesophagus, is at 
first a very slender tube,which, however, rapidly swells out and 
descends, forming manysinuositiesthe whole length of the body, 
twisting itself in its course round the intestinal tube. It ter¬ 
minates posteriorly by two spiculae, which, at their origin, and 
when retracted, are close to the sides. The two spiculae are very 
slender, equal in size, and about *36 mm. to *40 mm. in length. 
The organs of generation in the female .—The body of the 
female JDachmius trigonocephalus is in length from 9 mm. to 
13 mm., a little fuller, and the tail terminates more suddenly 
than that of the male, in a conic point. It is provided 
with two ovaries, which are tubular, and arise about the 
