TRANSLATION, 
On Myoryxtes WrisMANNI; @ NeW ParasitnE, inhabiting the 
Moscuius of the Froa.* 
In the course of his investigations into the termination of 
the nerves in the cutaneous thoracic muscle of the thorax of 
Rana temporaria, Prof. Koélliker observed several nematode 
worms, ‘These were sent to Prof. Eberth, who gives the 
following account of the parasite, the discovery of which was 
briefly announced in our last number. 
A portion of the muscle in question, which had been 
rendered slightly transparent by acetic acid, when examined 
by the naked eye, exhibited nothing remarkable; but under 
a magnifying power of about 60 diam., the author discovered, 
after some search, three minute nematodes. A higher power 
enabled him to ascertain that two of these worms lay partly 
extended and partly coiled up in the interior of the primitive 
fibres, and only one free in the perimysium. The former were 
themselves again included in an excessively delicate cylindri- 
cal sacculus of varying length, and either straight or curved. 
The walls of this sac were in close contact with the adjoining 
fibrille, which were compressed together by it. The walls 
of this tubular sac appeared in some places to meet, so that the 
cavity seemed to end in an acute point; but careful observa- 
tion and focussing showed that the cavity was continued beyond 
this constriction, gradually enlarging to its original diameter, 
and terminating in a well-defined, rounded opening, which 
appeared, as it were, to have been bored through the sar- 
colemma. 
A similar opening was several times noticed in fibres of 
the same muscle which contained no parasites. In the 
length of about 1smm., of three contiguous fibres, one pre- 
sented four such perforations, either disposed in a line 
parallel with the longitudinal axis or irregularly placed. In 
the former, the tube commencing at one of these orifices 
was clearly seen to open through the next one. No tube could 
be seen proceeding from the third orifice; whilst the fourth, 
* «Zeitsch, f. wiss. Zool.,’ xii, p. 580, 
