34 
That it inhabits the stomach as the two former species there is 
little doubt; and I have taken considerable pains to search for it 
at the slaughter-houses, and have found a species in the stomach 
which widely differs from the Equi and Hasmorrhoidalis, and which 
I presume may be the Larva of this. I have given a figuie of it 
at PL I. fig. 24 ; though it is possible there may be a fourth spe¬ 
cies inhabiting the stomach of the Horse, in which case it may 
be still doubtful, that I do not positively assert it to be this 
Larva belonging to the Veterinus. 
This Larva, if it is the Veterinus, may be known from the 
two preceding species, being smaller, of a more tapering or 
oblong figure, and the segments more detached and rounded, 
shining, smooth, and of a pellucid red or ruby colour, more par¬ 
ticularly at the tail or obtuse end. Although its coat appears 
smooth to the naked eye, the microscope detects small spines or 
points in double rows, the two lines alternating ; and these points 
occur less frequently in approaching the large end, the two last 
segments being destitute of them. In its very young state there 
appears to be but a single row of these points, the second row, 
or that nearest to the middle of the segment being wanting. 
Two short vesicular palpi appear at the very extremity of the 
targe end, situated upon the lips which cover the air plate. 
Through the thin transparent skin of this Larva when very 
young may be seen the beautiful silvery tubes of respiration, 
with their numerous ramifications, diverging, closing, bending, 
and playing among the soft matters within, and accommodating 
themselves to every movement of the animal. 
I have also seen, as I apprehend, another species in the stomach, 
which I take to be different to any of the before enumerated spe¬ 
cies, and which is much whiter than the three preceding, being 
almost perfectly white. I found them forming a cluster in the 
stomach of a Horse early in the sixth month, or June, and there¬ 
fore presume they were near their full growth ; their whiteness 
