ART. 15 NEW NEMATODE FROM THE RAT CRAM 7 



that the normal host ma^^ be a rodent other tlian the rat, j) resent 

 in the Park. That rats and cockroaches, pests commonly present 

 around such places, may play a part in the dissemination of parasites 

 formerly absent in a country but brought in by the animals in tlie 

 Zoological Park, is a possibility the recognition of which might have 

 a practical significance. 



EXPLANATION OF PLATES 



Plate 1. 



Protospirura columMana, new species 



Fig. 1. Head, lateral view. 



2. Head, en face view (same niagnificalion as fig. 1). 



3. Tail of male, lateral view. 



4. Tail of male, ventral view. 



5. Caudal end of male. 



6. Tail of female. 



Plate 2. 



Protospirura Columbiana, new species \ 



Fio. 7. Terminal genitalia of female. 



8. Vulva and anterior end of vagina. 



9. Male and female in copula. 



10. Egg. 



11. Tail of third stage larva, before encystment. 



12. Tail of third stage larva, after encystment. 



13. Tail of fourth stage larva. 



o 



