242 ZOOLOGY. 



4. Filaria, Body entirely filiform. 



5. Scolex. Body minute, gelatinous, opake ; head exertiie 



and retractile ', ■with four pellucid auricles. 



6. Ligula. Body linear, equal, long, with an impressed 



dorsal suture. 



7. Linguatala. Body depressed, oblong ; mouth situated 



forwards, and surrounded by four passages, 



8. Sirongylus, Body round, long, the fore-part globular 



and truncate, with a circular aperture fringed at the 

 margin ; hind-part of the male hooded, of the female 

 pointed. 



9. Echynorhynchus. Body round ; proboscis cylindrical, 



retractile, crowned with hooked prickles. 



10. Hoeruca. Body 'round; proboscis wanting; head 

 crowned viiilv prickles. 



11. Cuculanus. Body pointed behind; the fore part ob- 

 tuse, with an orbicular mouth. 



J 2. Caryophyllceus. Body round, smooth, with a large 

 dilated mouth. 



IS. Fasciola. Fluke. Body depressed, ovate ; with a ter- 

 minal and lateral pore. 



14. Tencea. Tape- Worm. Body flat, jointed ; head with 

 four orifices for suction, below the mouth ; mouth ter- 



