S42 ZOOLOGT. 



4. Filaria. Body entirely filiform. 



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



and retractile ; with four pellucid auricles. 



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



dorsal suture. 



7. Linguatala. Body depressed, oblong ; mouth situated 



forwards, and surrounded by four passages. 



8. Strongylus. 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. Hceruca. Body round ; proboscis wanting ; head 

 crowned viii]x prickles. 



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

 tuse, with an orbicular mouth. 



12. Caryophylloeus. Body round, smooth, with a large 

 dilated mouth. 



13. Fasciola. Fluke. JBot?y depressed, ovate ; with a ter- 

 minal and lateral pore. 



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

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



