ZOOLOGY. 241 



life ; though they all have a share la supporting the 

 numerous other tribes of Animals ; likewise, by their 

 various perforations in the earth, they add to its fertility, 

 by giving free access to the air and water. 



Linnaes divided them into five orders. 



ORDER I. 



lyTESTiN A,— INTESTINE WORMS. 



The Animals of this Order, are of the most simple con- 

 struction ; they are destitute of limbs, and are divisible 

 into intestinal, or such as inhabit the bodies of other 

 Animals ; and ^J^arth-Worms, or such as are usually met with 

 on the ground, this latter tribe are further separated into 

 those with and without lateral pores. 



* Intestinal i eyes zoanting. 



1. Ascaris. Body round, tapering at both extremities • 



head with three vesicles. 



2. Trichocephalus. Body round, tapering towards the tail ; 



Aearf furnished with a proboscis. 



3. Uncinaria. Body filiform, elastic ; head with membra- 



nous angular lips ; tail of the female, needle shaped ; 

 of the male, armed with two hooks encased in a pelucid 



vesicle. 



