ot swine. The egg of Arduenna strongylina (Fig. 20) is elliptical, 
34 to 39 microns long by 20 microns wide, thick-shelled, the shell sur¬ 
rounded by a thin irregular membrane, and contains a well developed 
embryo when deposited. The egg of Physocephalus sexalatus (Fig. 
21) is elliptical, 34 to 39 microns long by 15 to 17 microns wide, thick- 
shelled, the shell surrounded by a thin irregular membrane, and con¬ 
tains a well developed embryo when deposited. 
The eggs of the swine whipworm, Trichuris suis, are 52 to 56 microns 
long, brown, and lemon-shaped, as in the case of other species of the 
genus Trichuris, such as Tr. depressiuscula, which was figured (Fig. 11) 
on page 20. In the case of a closely related 'and highly important 
worm, Trichinella spiralis, which occurs in swine, eggs and larvae are 
not found in the feces, as the eggs, which have a delicate vitelline 
membrane but no true egg shell, hatch in the maternal uterus and 
Fig. 22. Crassiosoma urosubulatum. Eggs. Enlarged. From Alessandrini, 1909. 
the larvae migrate through the tissues of the host, the parasite being 
transmitted by new hosts eating meat infested with these larvae and 
not through the medium of the feces. 
Swine in this country and elsewhere are infested occasionally by 
a worm belonging in the group of hookworms. This swine hookworm 
is known as Globocephalus longemucronatus or Crassiosoma urosubu¬ 
latum. The description applied to the worm under the first of these 
names does not appear to conform to the description given for the 
worm described under the second name, but the points of agreement 
are such that it is possible that they are identical. The eggs (Fig. 22) 
of this worm are elliptical and 52 microns long by 35 to 36 microns wide. 
In this connection it is of interest to note that the Old World hook¬ 
worm of man, Ancylostotna duodenale, has been reported from swine 
in the Ellice Islands by O’Connor and that Legg and Reuben state that 
they find it relatively common in swine in Queensland, Australia. Ran¬ 
som has recently reported the occurrence of three specimens of the dog 
29 
