(120° '9 
CLASS XI. INTESTINA. 
Remarks. This class does not include those 
animals which enter the bodies of other animals 
in maturity. Itincludes those only which reside 
and propagate in the alimentary canals, glands, 
cellular membranes and parenchymous coverings 
of other animals. As they have no respiratory 
organs, it is evident that the influence of oxygen, 
necessary to animal life, is, in some unexplained 
manner, transmitted to them through the animals 
which they inhabit. Their deficiency, in respira- 
tory organs and in nerves, induce many natural- 
ists to consider them as morbid excrescences, not 
entitled to the rank of animals. 
ORDER 1. CAVITORIA. 
Having internal cavities for the reception of food, 
and mouths. 
_ Fivartia, (negro-eater,) body round, filiform, 
equal and quite smooth ; mons dilated with a 
roundish concave lip. In negro’s feet. 3 
TricHocreruaLus, (hair-head,) body round, 
elastic, and variously twisted ; head or forepart 
much thicker and furnished with a slender exser- 
tile proboscis ; ‘sil or lower part long, capillary, 
and tapering toe point. In men, horses, &c. 
CucuLianus, (hooded worm,) body sharp, 
pointed behind, and obtuse before ; mouth orbi- 
cular with a straight hood. In moles, buzzards, 
frogs, fish. 
Ascaris, (spindle-worm,) body round, elastic, 
and tapering towards each extremity ; head with 
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