NEMATODA 355 



Strongylus contortus, Rud. 



Dr Reakes thinks this parasite has been introduced within the 

 last 20 years. It occurs in most parts of the Dominion, especially 

 in damp, recently-fallen bushlands. He is of opinion that in con- 

 junction with S. cervicornis and S. gracilis, it causes more loss among 

 stock than all the other diseases of sheep put together. It is found 

 chiefly in the fourth stomach of sheep and lambs. Colonel Reid 

 states that it also occurs as an endo-parasite of cattle. 



It is found in the true stomach of young calves, and in some 

 countries causes heavy mortality among them, especially when they 

 are not properly fed. 



Strongylus mtcrurus, Mehlis. Lung Worm, causing Husk or Hoose 



Dr Reakes states that this worm causes great loss among calves, 

 but it is thought that it is not so serious a plague now as it used to 

 be, as farmers rear and feed their stock better. 



Strongylus ovis-pulmonalis, Ercolani 



This parasite was apparently first reported as occurring in 1897 

 among sheep at Okoroire. 



In 1902 Dr Gilruth found it encysted in the lungs of sheep. 



Strongylus pulmonaris, Ercolani 



Colonel Reid reports this species as occurring in cattle. It inhabits 

 the bronchi of calves. 



Strongylus cervicornis, McFadyean 



This species was first reported in 1897 as occurring in young 

 sheep at Okoroire. In 1899 Dr Gilruth reported parasitic gastritis in 

 calves at Orepuki, Southland, as due to this worm. Mr McFadyean 

 also found it in old cattle on the west coast of the North Island. He 

 also met with it in sheep, but in their case not burrowing into the 

 gastric glands. In the Agricultural Department's report for 1906 it 

 is recorded as having been met with in the fourth stomach of an 

 Angora goat. 



Strongylus convolutus, Ostertag 



Dr Reakes (writing in 19 16) states that this parasite has " probably 

 been introduced within the last fifteen years." It is very destructive 

 to young cattle, causing heavy mortality, especially among those 

 which have not been properly fed. The worm encysts itself in the 

 walls of the stomach. 



23 — 2 



