R. T. Leiper 
79 
ducts to the body wall. These ducts pass into the circum-oral swelling 
and by the union of adjacent ducts each pair of glands discharges by a 
single common duct that perforates the adjacent lip. The glands 
measure 1 mm. in length by OT mm. in breadth and show characteristic 
spiral markings upon their exterior. 
Genitalia. 
In the male four pairs of genital papillae surround the cloaca, two 
pairs lying pi’e-anally, two post-anally. They are large and nipple-like 
in shape, but decrease in size from before backwards. The cuticle 
overlying them seems to be detached from the body wall as a uniform 
fold, but there is no indication of the formation of anything resembling 
a bursa. 
The two spicules are of similar design but differ markedly in length. 
Both are solid chitinous rods with a slight ventral curve ending in a 
blunted tip. They are unpigmented. The larger spicule measures 
IT mm. in length, the smaller 0'4 mm. The specimen, like the 
previously recorded one, appears to be sexually immature. Owing to 
the indifferent fixation nothing can be made out of the disposition of 
the testicular tubule save that in the region of the cloaca there is 
a distinct muscular ejaculatory duct T5 mm. long. 
The characters of the female worm, as given by Levinsen, are in¬ 
corporated here for the sake of completeness. 
“Corpus robustum, in dimidio modo anteriore spinulosum, lamellulis 
antice tridentatis, dente media dentibus lateralibus haud multo longiore. 
Pars capitiformis lata et brevis, seriebus octo spinarum instructa. 
Corpus in partem caudalem trilobatum desinet. 
“ Longit. 9 mm., latit. maxima 1 mm. Exemplar unicum (feminam) 
hujus vermis, a Deuntzer, medico in Bangkok inventi, examinari e 
tumore parvo pectorali (mammali ?) feminae juvenis siamensis ex- 
haustum. Exemplaria quinque vel sex ejusdem vermis e tumore 
similis alius hominis exhausta non conservata sunt.” 
Is Man the true host of the parasite? 
The genus Gnathostoma, like its near relative Tanqua, is composed 
of species that are essentially intestinal forms. They live in the 
stomach of their host, giving rise to large fibrous thickenings at their 
site of attachment. G. siamense is the only species of the genus that 
