TRANSLATIONS FROM CONTINENTAL JOURNALS. 553 
organization of which has just been described, is evidently the 
hematoid, which M. Dujardin has described in his f Histoire 
Naturelle des Helminth.es/ p. 277. But according to the 
learned professor of Rennes, whose recent loss to science is 
deeply to be regretted, it is doubtful whether this is the para¬ 
site, which Rudolphi has named Strongylus trigonocephalies. 
Rudolphi attributes to his Strongylus a length of from 13 to 
27 millimetres; and moreover, he assigns the situation of the 
vulva as only a short distance from the end of the tail. Now 
these characters do not agree with the Dachmius trigono- 
cephalus , which is only from 6 to 13 millimetres in length, and 
the vulva of which opens at from 3 to 5 millimetres from the 
caudal extremity. Neither do we believe that the difference 
between Dujardin and Rudolphi results from the latter having 
confounded the Spiroptera sanguinolenta with the Dachmius 
trigonocephalies. The former is from 40 to 80 millmetres in 
length, and the vulva of which is from 2 to 3 millimetres from 
the mouth. It appears probable that Rudolphi had another 
parasite in view, in his description, than the one after¬ 
wards described by Dujardin; and this might have been the 
helminthia, which has been found in the pulmonary artery 
and the right cavities of the heart. By his dimension, the 
worm found in the blood-vessels and the heart of the dog does 
really resemble that described by Rudolphi; and moreover, it 
has, like the latter, the vulva placed close to the end of the 
tail. We have, therefore, provisionally designated it as the 
Strongylus trigonocephalies , Rudolphi, not Dujardin. There is, 
however, one circumstance which makes us hesitate in con¬ 
sidering it as identical with the one described by that cele¬ 
brated helminthologist. Rudolphi states that he found his 
Strongylus in the intestines of the dog, while that collected 
at Toulouse has been found four times since 1824, either in 
the heart or the pulmonary vessels, and never in the intestines 
of the dog, although, from the great number of dogs which 
have been sacrificed for divers experiments, or have died in 
the infirmary of the school, there have been ample oppor¬ 
tunities for researches, as they have all been subjected to 
post-mortem examinations for that purpose. But we must 
add, that the different habitat is not a sufficient reason for 
considering them as of different species; for many zoologists, 
have considered as constituting only one species, the scleros- 
toinae of the intestines of the horse, and the parasite found in 
aneurism of some of the arteries in the solipedes. It is there¬ 
fore not impossible that the worm which we have described 
may inhabit the vessels and the heart of the dog, and, at the 
same time the intestines of the same animal. Whatever the 
