GKNKKAL CATHOnOGY. 
165 
As far us the hedgehog is concerned, 1 am convinced that 
trichina has been mistaken for another worm of the Spiroptera 
gender, probably the encysted larvae of the Spiroptera clausa , 
very common in the intestines of the hedgehog. I beg to show 
the Society preparations and enlarged drawings of an encysted 
nematode which was in the sheets of the omentum of a hedge¬ 
hog, and which, at first, sight, can be mistaken for the larvae of 
the trichina spiralis, but by attentive observation it can be seen 
that if the dimensions of the cysts and of the worms they contain 
have a great analogy, they differ in their details. This worm of 
the hedgehog is more cylindrical, its mouth has a papilla, its 
pharynx is well-defined, its oesophagus long and in club shape, 
is not surrounded by the so characteristic cells of the trichinae; 
the caudal extremity ends as an elongated cone, at the base of 
which is the anus, while this is terminal in the trichina, whose 
posterior extremity is wide, truncated and tailless. All these 
details, therefore, of the worm of the hedgehog are characteristic 
of the gender spiroptera, and not of the trichinae; and, again, 
the interior of the cyst of the worm of the hedgehog is filled 
with a brown, granular matter, which does not exist in the tri¬ 
chinae. I have not yet seen the cysts found by Siebold in the 
grey lizard, but, thanks to Mr. Blanchard, I have been able to 
study similar ones in the green lizards of Spain. These cysts tire 
numerous not only in the muscles but also in the intra-visceral and 
subcutaneous cellular tissue. Here, also, we have no trichina, 
but larvae of the Spiroptera abbreviata It., whose adults are found 
in abundance in the intestines of the same lizard. These larvae 
have all the characteristics of the gender spiroptera ; and, besides, 
are, ais well as their cysts, twice and a half larger than the tri¬ 
china and their cysts. 
I have had lately the occasion to study a small encysted hel¬ 
minth found in the muscles of the frog which has more resem¬ 
blance to trichina than the one described above ; like that of the 
hedgehog, it has the same dimensions, but it is also a spiroptera 
which is almost cylindrical instead of being flattened forward as 
the trichime; which has the oesophageal region deprived of the 
characteristic cells of the trichinas, and again which has a blunt 
