BY T. HARVEY JOHNSTON, M.A., D.SC. 69* 



The female organs are duplicated and are somewhat 

 obliquely placed. The inner and anterior portion of the 

 female complex consists of the ovary, while the more 

 laterally situated posterior division consists of the vitellarium 

 Separating the two is the receptaculum seminis. The vagina 

 travels inwards behind and below the cirrus sac in a slightly 

 sinuous course, becoming widened in its progress, its inner 

 portion being the widest portion. As already mentioned^ 

 this receptaculum lies above and anterior to, the yolk 

 gland. Each uterus arises as a transverse tube from which 

 numerous processes or pouches develop anteriorly and 

 posteriorly. The two uteri extend medianly and eventu- 

 ally almost touch. I have not determined whether they 

 ultimately fuse or not. 



The above description is of a preliminary nature. 



Dibothriocepkalus felis, Creplin. 

 This cestode is met with occasionally in cats. In 

 addition to specimens from Queensland, I have others 

 collected in Melbourne, in Sydney, and near Gosford, New 

 South Wales. 



Cysticercoids of Hymenolepis diminitta and H. murina, 



(PI. Ill; Fig. 11). 



During the time that I was associated with the Govern- 

 ment Bureau of Microbiology, Sydney, 1 had opportunity of 

 examining some thousands of rat- fleas, the species repre- 

 sented being almost entirely the three common fleas infesting 

 Muridce, viz., Xenopsylla cheopis, Ceratophyllus fasciatus 

 and Ctenopsyllus muscidi. In the last-named species, 

 no parasites were found, while in the two former there 

 were met with occasionally two distinct species of 

 Cysticercoids as well as larval nematodes to be referred 

 to later. Rarely, both the nematodes and one or other 

 species of Cystercoid occurred in the one host, and alsa 

 rarely, both species of Cysticercoid in the same Ceratophyllus, 



These cestode larval are identical with those described 

 and figured by NicoU and Minchin (1910, p. 9 ; text figs, 

 1, 2, Minchin, 1909, p. 741), who proved experimentally 

 that they were the Cysticercoid stages of two common 

 rat-parasites, Hymenolepis diminuta and H. murina. They 

 were found only in Ceratophyllus fasciatus and in about 



