BY T. HARVEY JOHNSTON. 69 



H armor hynchus moniliformis Br. 



This echinorhjaich was found in six out of 119 

 specimens of Epimys rattus (percentage = 5 ) ; 2 out of 100 

 Epimys alexandrinus (2%), and 2 out of 121 Epimys 

 norvegicus (1.65%) collected and carefully examined in 

 Sydney during the period August, 1909 to February, 1910. 



The greatest number obtained from any one host was 

 244 — ^from Epimys rattus — no other parasites being present. 

 The lumen of the intestine was filled with them. Their 

 length ranged from about half an inch to seven and a-half 

 inches, most of the females being exceptionally long. In 

 October, 1909, I obtained approximately 200 from a broA\'n 

 rat {E. norvegicus), one being eight inches long and another 

 female seven and a-quarter (J. 1909a, p. 219). The next 

 greatest numbers obtained in one animal were 25 (from E. 

 rattus), 21 (from E. norvegicus), and 19 (from^. alexandrinus). 

 The usual number appears to be from two to four. 



My record of this parasite from the mouse is an error 

 (J. 19096, p. 583). 



Heavy Multiple injections found in Sydney. 



Under the heading of Trichuris muris reference has 

 been made to a good example of multiple infection, but it 

 was not heavy. In E. norvegicus I found on one occasion 

 (Feb. 1910) the liver riddled with Hepaticola hepatica, 

 the stomach contained 51 Protospirura muris ; the intestine 

 held several hundred Heterakis spumosa, hundreds of 

 Heligmosomum braziliense, six Hymenolepis diminuta and 

 four Hym. nana ; while in the bladder were two Trichoso- 

 moides crassicauda. 



In an E. norvegicus, examined in March 1909, were 43 

 Protospirura muris, 21 Horrnorhynchus moniliformis, a few 

 Oxyuris obvelata and some Heterakis spumosa, while the liver 

 contained abundant Hepaticola hepatica. An example of 

 E. rattus (Sept. 1909) yielded 276 Oxyuris obvelata and 40 

 Hymenolejns nana. In one specimen of E. norvegicus I 

 counted six large Hymenolepis diminuta and six H. nana ; 

 in another, three of the former and thirteen of the latter ; 

 and in a third, five of the former and nine of the latter. 

 In some cases other ]^.arasites were present as well. 



