120 



CLASS XL INTESTINA. 



Remarks. This class does not include those 

 animals which enter the bodies of other animals 

 in maturity It includes those only whi^h 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. CAV1TORIA. 



Having internal cavities Jbr the reception of food] 

 and mouths. 



FILARIA, (negro-eater,) body round, filiform, 

 equal and quite smooth ; mouth dilated with a 

 roundish concave lip. In negro's feet. 



TRICHOOEPHALUS, (hair-head,) body round, 

 elastic, arid variously twisted ; head or forepart 

 much thicker and furnished with a slender exser- 

 tile proboscis ; tail or lower part long, capillary, 

 and tapering to a point. In men, horses, c. 



CUCULLANUS, (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 



