ENTOZOA. 219 



APIS UNICOLOR, Lafr.— Almost black, shining, the 

 abdomen without spots or coloured bands. — Inhabits 

 the Isle of France. — Nouv. Did. i. 47. 



APIS INDICA, Fabr. — Black, with a grey cinereous 

 down, the first two segments of the abdomen and the 

 base of the third reddish-brown. — Inhabits Bengal, &c. 

 — Nouv. Diet. i. 47. 



Class XII.— ENTOZOA. 



Body soft, elongated., naked, smooth, without head, 

 properly so called, eyes, or feet ; mouth formed of one 

 or many suckers, and furnished in the greater number 

 with minute teeth, by which they attach themselves to 

 and pierce through the bodies of animals ; no tentacula 

 or distinct organs of respiration; intestinal canal without 

 cceca or convolutions, and in some scarcely perceptible ; 

 sexes distinct. 



The animals of this class are parasitic, or live and propagate only 

 in the bodies of other animals. It seems to be a law of nature 

 that all animals have other animals still smaller which reside within 

 them, and derive their nourishment from their various textures. 

 Of these, some are common to several classes of animals, while 

 others, again, are peculiar to, and are only found in particular spe- 

 cies. They occur not only in the alimentary canal and in the 

 vessels which communicate with it, but in the cellular tissue, in 

 the liver and gall-bladder, in the cornea of the eye, the bronchiee, 

 the fauces, the kidneys, in the parenchyma of all the internal organs, 

 and even in the brain itself. Goeze says, that worms have been 

 found in the intestines of the human embryo. Some of these 

 are evidently taken in with the food and drink, and are called 



