550 TRANSLATIONS FROM CONTINENTAL JOURNALS. 
a lank, slender, cylindrical body, pointed at the extremities, 
often marked throughout its whole length by a reddish, spiral 
line, frequently interrupted, marked under the skill by the 
digestive tube. The head measures from *08mm. to *10mm., 
and is straight; generally provided with two transparent 
membranous folds (which, perhaps, are produced by endos- 
mosis, from the worm having been left in water a few seconds 
before examination), and which, uniting anteriorly, form a 
sort of narrow border more or less deeply margined. The 
integument is not striated transversely, but is marked by some 
longitudinal lines far apart. 
j Digestive apparatus .—The mouth of the DacJimius trigono- 
cepJialus is somewhat lateral, orbicular, wide open, and fur¬ 
nished with a prominent border. In continuation of the 
mouth there is a pharyngeal capsule in the form of a cupola, 
with widened resisting parietes. The oesophagus, at first 
cylindrical, swells out towards its posterior half. The intes¬ 
tine, which is a continuation of the oesophagus, is at its origin 
not so large as the latter, is slightly bosselated, and is in a straight 
line from the mouth to the anus ; before reaching the latter it 
becomes a little contracted. The anus is placed a little ante¬ 
rior to the end of the tail. To the digestive apparatus are 
annexed two organs of secretion, which seem to be analogous 
to salivary glands. These glands are situated where the organs 
of generation (the testicles or ovaries) describe their curves 
anteriorly ; one of them is placed a little more backward ; both 
are the shape of a small, elongated vesicle, bulging out in the 
middle, terminating posteriorly in a cut de sac , obtuse and 
canoi'd in form, becoming insensibly more slender anteriorly, 
until it forms a verv narrow tube, which terminates with an 
opening in the pharyngeal cavity. Each of these glands has 
in its centre a sort of opaque nucleus. The mouth of the 
nematoid of the vessels and of the heart is very small, round, 
naked, terminal, and unprovided with a pharyngeal capsule. 
The oesophagus is short, and hardly any wider at its termi¬ 
nation than at its origin. The intestine is fuller than the 
oesophagus; its course is traced under the integument by a 
reddish line, as before stated ; it is longer than the body, 
very sinuous, as if twisted with the tube of the organs of 
generation. The anus in the male is a little anterior to the 
membranous ala, and in the female a little anterior to the 
point of the tail; finally, up to the present time, no trace of a 
salivary apparatus has been discovered. 
The organs of generation in the male. —The male JDachmius tri- 
gonocephalus is from 6mm. to 8mm. in length. Its tail terminates 
by a membranous ala or wins* which is divided into three lobes ♦ 
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