BY T. HAKVEY JOHXSTOX. 61 



irongylonema sp. 



In March 11)09 1 found in the liYer of a mouse (Sydney), 

 in addition to Hepaticola hepatica, a number of Filariid 

 eggs containing well developed embryos. Similar ova were 

 found in the liver of a Avhite mouse in September 1909 ; 

 I believe that they all belonged to a Gongylonema. 



Trichosomoides crassicaiula Belli ngham . 



During the months of August, September, October and 

 Xovember 1909 autl February 1910 1 examined a large 

 number of urinary bladders taken from Muridae in Sydnej^, 

 for the j)urpose of ascertaining the frequency of this parasite. 

 Out of 163 specimens of Epimys raftus, only one was found 

 infected (Sept. 1909), six worms being found in it (% 

 infection =.6) ; out of 246 Epimys olexandrinus only one 

 contained T. crassicaudu, a single specimen being found 

 (Sept. 1909). Thus 409 specimens of the house and ship 

 rats (which are really only varieties of the one species 

 Epimys raftifs) yielded tA\'o with parasitised bladders 

 (% infection=.5) ; 83 l)ladders collected from mice were 

 all found to be free from the nematode. 



The parasite A\as found in 74 out of 205 Ep. liorregicus 

 examined (=^31.2%), the greatest number of females 

 obtained from any one host being 15 (twice), 11. 10 (twice) 

 and 9 several times. There Avere usually found from one 

 to three. 



A re-examination ^)f my material has convinced me that 

 my record of the single occurrence of this \\orm in the mouse 

 (1909fl, p. 591) is incorrect, having been based 0)i the thin 

 anterior ])ortion of a damaged Trichuris mnris A\'hich during 

 the dissection of the host had evidently been set free into 

 the ccelome and become associated with the bladder when 

 the latter was removed by my assistant for examination. 



Trichuris nutris Schr. (Syn Trichorephalus nodosus R.). 

 The whip Morm was not found in 121 Epimys norvegicus 

 collected and examined in Sydney betAveen Augu.st 1909 

 and February 1910. It occurred three times in 1 19 .specimens 

 of E. raUus and once in 100 E. alexandrinus in the same 

 period. The greatest number obtained from any one animal 

 was twenty-tMO {E. raftus). In three ca.ses no other 



