[ 32 ] 
At a depth varying from .75 to 1.25 mm. from the surface a softer 
ayer is encountered. 1 his lines a small cavity consisting of loose tissue 
bathed m a minute amount of yellowish fluid. Inside this liquid the head 
ot the female worm is usually seen. It may be more or less easily traced 
out as a yellowish structure for 5 to 7 mm. After that more tearing 0 f the 
surrounding dense tissue has to be done in order to follow out its course. 
.7 he * irm adherence of the worm to the various layers of the vessel wall and 
its exceedingly wavy course make it impossible for one to dissect it out 
whote so that at 20 or 30 mm. from its mouth the worm is usually torn 
o and the full length cannot be fully ascertained. On thing is, however 
certain, and that is the fact that the worm whose head portion is enclosed 
within the round blind tumour is continuous with the vellow serpiginous 
tract running along the aorta. It is almost always at the beginning of this 
wavy line that the worm is torn off. 
Although the majority of round blind tumours are situated in the 
interior of the vessel it occasionally happens that a large round stiff projection 
is seen on the external coat of the aorta. When dissected this external 
tumour proves to be of the same structure as the smooth tumour found 
inside. I he same yellow fluid and yellow worm are harboured inside it. 
It should, however, be mentioned that in addition to the yellow female 
woim, the male element also exists in certain tumours alongside of it. The 
presence of the latter is not so frequent in bullocks as in buffaloes and it is 
larder than even the female to isolate from the surrounding fibrous mass. 
Microscopically the male worm is thinner and more delicate; its colour is 
white and opaque instead of yellow. 
The usual rule is for one male to be harboured alongside a female, but 
on rare occasions two males may be found inside one tumour. More 
frequent than not, out of the serpiginous tracts parts of both male and 
female worms may be extracted wound round one another. 
. The y ellow liquid contains granular debris and broken down tissue 
\\ith a variable number of ova and embryos, some free, some still encapsuled. 
I he free ones are usually very active, and present in the fresh state no 
marked features different in any way from those found in buffalo tumours. 
Other kinds of I umours in the Bullock’s Aorta. 
Besides the round blind tumours two other kinds have been noted in 
the bullock. One of these takes the form of a short blunt prolongation 
downwards from the centre of a smooth tumour in the aorta. This probably 
represents the remains of a worm of the same species as that commonly 
found in the buffalo. A dissection of its contents confirms this opinion, for 
within the stump may be found the calcified remains of an old worm. Five 
of these peculiarly shaped tumours have been met with altogether. 
Besides the above, one exceedingly interesting tumour in the form of a 
papilloma has been found. This papilloma is irregularly shaped, being 
more bulky below than above, and is attached to the aorta by a short 
stoutish stem springing from a swelling lying on the aorta. The projection 
and stem are no doubt the remains of the pearly tumour and worm described 
above (buffalo’s), whilst the reddish brown papilloma is no more than a lar^e 
clot of blood which has been formed gradually on the stem. 
