ZOOLOGY. 



241 



life ; thoisgh they all have a share m 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. 



UTESTmA,-^lNTESTINE 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 Earth-Worms, or such as are usually met with 

 on the ground, this latter tribe are further separated int® 

 those with and without lateral pores. 



* Intestinal ; e^jes wanting. 



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

 head with three vesicles, 



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

 head furnished with di 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. 



