622 CONTRIBUTIONS TO COMPARATIVE PATHOLOGY. 
denticulatis. Genitale masculum spiculum simplex, ad basin 
papillis circumdatum. 
“ Sp. Gnath. spinigerum. Gnath., capite truncato, corpore 
seriebus plurimis spinulorum armato.” 
The internal anatomy of these worms presents some peculi- 
arities which had not been before detected in the class entozoa ; 
particularly a distinct salivary apparatus like that which exists 
in the holothuria and other echinodermata. This apparatus con- 
sisted of four elongated straight blind tubes, each about two 
lines in length, composed of spiral decussating fibres, their con- 
tents being semi-pellucid, placed at equal distances around the 
commencement of the alimentary canal, having their smaller 
extremities directed forward, opening into the mouth at the back 
of the lateral tridentate processes. The co-existence of these 
salivary glands, with an oral apparatus, better adapted for tritu- 
ration than any that had been yet discovered in the entozoa , is a 
highly interesting circumstance. Connected with this is the 
evident trace of a stomach, about three lines in length, contain- 
ing a milk-white substance, and separated by a well-marked 
constriction from the remaining portion, which may, therefore, 
be regarded as intestine. The internal surface of this intestine 
has something resembling valvules conniventes ; at least it has 
large, regular, obtuse, lozenge-shaped processes, arranged in 
alternate longitudinal rows. 
These tumours, which, not having seen their contents, I ima- 
gined to be strumous, w 7 ere not the immediate cause of the death 
of the animal. On opening the thorax, this was plain enough. 
An aneurism of the posterior aorta had burst within the pericar- 
dium. That sac was filled with blood — the pulsations of the 
heart could no longer be carried on, and the animal had died 
instantaneously. Thus far, however, I am still disposed to think 
that the strumous disease under which the animal had laboured 
was connected with the immediate cause of death, by the arte- 
rial debility which it would necessarily produce. The tumours 
in the stomach, I am now 7 disposed to believe, with Mr. Owen, 
were produced by the irritation of the entozoa. 
