ZOOLOGY. ^43 



minal, mostly crowned with a double series of retractile 

 hooks. 



An extremely troublesome and injurious tribe, inhabiting 

 the intestines of Mankind, as also several species of Quadru- 

 peds and Birds ; they are very tenacious of life, and are 

 reproduced from parts or joints that accidentally become 

 detached. 



1 5. Furia, Body linear, ciliated on each side with reflect^ 

 ed appressed prickles, 



** JSot inhabiting other Animals. 



16. Gordius, Hair- Worm. Bod^ equalj filiform, round 



and smooth. 



17. Hirudo, Leech. Body truncate at each extremity; 

 head and tail dilated when in motion. 



*** Not inhabiting other Animals^ but furnished with a 

 lateral pore, 



18. Lumbricus, Dew, or Earth- Worm. Body round, an- 

 nulated, furnished with minute concealed prickles, 



19. Siphunculus, Tube- Worm. Body round ; mouth cylin- 

 drical, and narrower than the head, aperture on the side. 



20. Planaria, Body gelatinous, depressed, with a doubU 

 ventral pore, 



R 2 



