calcareously infiltrated parasites, none was found however, so 
that it is ver y unlikely that the larva was concerned in the cause 
of death. 
The larva was active and crawled about on the moist surface of 
the pleura, and in saline solution like the larva of the house-fly. 
Its color was white beeoming translucent and grayish when moun- 
ted in saline solution under a cover slip. The body is flattened 
and tapers to an obtuse point posteriorly. Its encircled transver- 
selv with alternate rows of pores and retrorse colorless chitinous 
spines. T here are 92 rows of spines about 0,072 mm. apart, each 
spine is about 0,036 mm. long. The first row e noircies the mouth 
and on each side is inserted 0,184 mm. from its neighbour, dip- 
ping ventrally. The fourth and fifth rows of spines are incomplète 
ventrally on a line with the mouth. The mouth is subterminal and 
elliptical in shape ; it is reinforcecl by a rim of chitin. At each an¬ 
gle formed by the anterior margin and the sides is a small stig- 
mal pore (?) which communicates with the interior by a small ca¬ 
nal. Surrounding the mouth are two pair of strong, jointed, chi¬ 
tinous hooks, the jaws of the anterior pair being on a plane trans¬ 
verse with the oral aperture. The second pair are placed a little 
posterior to and more external than the first. The anterior join¬ 
ted portion of the hooks is very sharp and may be protruded 
through invaginations in the integument of the larva. The hooks 
are 0,576 mm. long. When the anterior portion of the hooks is 
retraeted, the convexity of the sharp pointed tip fits into a short 
chitinous, protective Socket or groove. After wachting the move- 
ments of the hooks, it is seen that the anterior jointed end, with 
its very sharp point, lias a hammer-like action, and is projected 
and retraeted by a movement very much like that of a cat’s claws. 
The impression received at first is that the hooks are the termi¬ 
nais of legs, but, as Dr. Stiles had pointed out, they are to be 
regarded as homologues of mandibles and palpi. 
This is the second specimen of L. serrata (larva) seen here. In 
1905 a larva, slightly larger than the one described here, was seen 
in a.specimen of faeces from a man.who, it is believed, was either 
a native of, or long résident, in Central America. 
No specimens of the adult parasite hâve been found in any of 
the dogs, cattle or horses examined here. 
