70 NOTES ON SOMK E'NTOZOA 



f6ur per cent, of specimens examined. The former larva 

 is pyi'iform, with an unarmed scolex and a fairly long tail, 

 while the Gysticercoid of H. murina is rather broad€fr 

 and shorter, has scolex armed with small hooks and 

 pfossesses a short thick tail. 



Xenopsylla cheopis is thus a new host for these two 

 larval forms, and the known geographical distribution 

 is extended from Europe to Australia. As mentioned 

 by Nicoll and Minchin, there is usually only one larva 

 present at a time, but I have met with multiple infection. 

 On one occasion there were found no less than nine Cysticer- 

 coids of H. murina (see Fig. 11) in a Ceratophyllus fasciatus 

 taken from Mas decumanus in Sydney (1909) ; on another 

 occasion three larvae belonging to the same species were 

 found in a Xenopsylla cheopis taken from Mus ratfus, also 

 in Sydney. One specimen, a H. diminuta Gysticercoid, 

 was found in one flea, C. fasciatus, out of six sent to me in 

 1910 from Melbourne for identification. 



The presence of these parasites was detected in 

 specimens of fleas after clearing the latter and mounting 

 them in long series in canada balsam. 



A record of the per centage infection was kept, but 

 it has been mislaid. It was, I believe, about the same as 

 that alread}^ recorded. 



Sparganiim, sp, 



(PI. II ; Figs. 5, 6). 



Cestode larvae (plerocercoids) occur occasionally in 

 certain parts of the body, mainly in the thigh muscles, 

 of some Australian frogs, e.g., Hyla aurea and H. ccerulea. 

 I have examined specimens from the former host from Perth, 

 West Australia, collected by Dr. J. B. Cleland, and from 

 Sydney, X.S. Wales, collected by Dr. S. J. Johnston, and 

 by myself ; and also from the latter host from Sydney, 

 and from the Burnett River, Queensland, collected by 

 Dr. Bancroft. The figures have been drawn from a specimen 

 mounted by Dr. S. J. Johnston. 



The parasite has already been described by Professor 

 Haswell (1890, p. 661), its occurrence in varir^us localities 

 having been noted by myself (19116, p. 334) Prof. J. Pi 

 Hill (1905, p. 369) also has referred to it The general 



