ENTOZO A — NEM ATOIDE A . 
299 
is very incomplete, when contrasted with Mayer’s copious work on the 
same subject (Jahresb. 1842). 
De la Harpe (Gurlt und Hertwig’s Mag. f. Thierheilk. 1842, p. 14) 
found, in the fatty degenerations of sheep’s lungs, a complication of very 
small worms and clusters of eggs, which, he could not doubt, proceeded 
from Strongylus jfilaria, a parasite, that, at the same time, covered the 
lungs in great number. 
Kayer has published an excellent paper on Worm-aneurism and the 
Strongylus armatus minor, Rud. (Archiv. de Med. Comp, par Rayer, 
Paris, No. 1, Oct. 1842, p. 1 ; Recherches Critiques et nouvelles obser- 
vations sur I’Aneurysme Vermineux, et sur le Strongylus armatus 
minor, Rud., par Rayer ; and Froriep’s Neue Notiz. Bd. 28, p. 223). 
According to Rayer’s investigations, the worm-aneurism almost always 
developes itself, in Solidimgulous animals, in the arteria mesenterica 
anterior, and generally in adult and old individuals. He found the cavi- 
ties of the aneurismal dilatations sometimes narrowed, or quite filled up by 
a growth of fibrous layers ; in the smaller depositions of these layers only 
few Strongyli were present, but in those of larger size, they were found 
in greater number ; they were often also met with in the ossified arterial 
walls of the aneurism. Rayer has never seen the internal arterial coat of 
such worm-aneurisms perforated or ulcerated ; the worms remain between 
the layers of the fibrous deposition, never between the coats of the artery. 
Worm-aneurisms, it is believed, do not burst, as they are always accom- 
panied by hypertrophy of the arterial walls ; but Rayer, in opposition to 
this opinion, asserts, that the Strongyli pierce the walls of the arteries 
and so get into the cavities. He also objects to the assumption of Mor- 
gagni, Rudolphi, Laennec, Otto, and others, that the tubercles in the 
walls of arteries, containing Strongyli, cause the formation of aneurism, 
as such tubercles are only found in dogs and without aneurisms. The 
most of the Strongyli are found in the fibrous deposits, and project 
sometimes with the head, sometimes with the tail ; only a few lie free in 
the aneurismal cavities. The red colour of these worms does not proceed 
from the blood sucked in, but from resting upon it and being washed 
with it. The description of the worms themselves contains nothing new. 
A case of aneurism has been given by Gruby, in the coeliac trunk of a 
horse, in the cavity of which fibrous deposits and Entozoa, resembling 
Ascarides, were found ; certainly, however, they could have been nothing 
else than individuals of Strongylus armatus minor. 
Leuckart found a Strongylus in the small intestine of Myoxus glis 
(Zool. Bruchst. iii. Helminthol. Beitr. 1842, p. 38), which he has charac- 
terized as St. gracilis in the following way : — Capite exiguo, elongate, 
obtusiusculo, alato ; ore orbicular! ; bursa maris ampla, costulata, 
margine leniter incisa ; feminae parte corporis posticas crassiore, in 
mucronem (caudam) tenuiorem depressum exeunte. The colour is 
343 
