Onchocerciasis in Cattle and Associated Animals. 



27 



The contention of Dr. Gilruth and myself (1912, p. 24) that the 

 buffalo was probably not the means of introduction — since the 

 buffalo hunters of the Northern Territory (who used the brisket 

 for food and the skins for export) have never seen these nodules — is- 

 strongly supported by the fact that both in Java and in India, 

 whence buffalo have been imported into Australia, although nodules 

 are present, they are found closely attached to the skin, a fact 

 which was unknown to us at that time. 1 



The intermediate character of 0. indica in some respects between 

 0. gibsoni and 0. gutturosa suggests the possible origin of the 

 latter form from 0. indica at some earlier period in some way not 

 yet known. 



No definite evidence is forthcoming from any source as to the- 

 life-history of these forms. 



SUMMARY. 



1. Worm-nodules in the connective tissues, caused by species of 

 Onchocerca are now known to exist in cattle and associated animals 

 as follow : — 



1 See Addendum 1. 



2 The mark (?) In this column indicates that, although I have now evidence of the existence of 

 the nodules as indicated, either the material available is useless for exact Specific determination, 

 or else material for this purpose is not yet in hand. 



3 The mark — indicates that such nodules are as yet unknown in these cases. 



