98 THE ENDOPARASITES OF THE DINGO. 
or more probably, that it was one of the several cestodes 
known to parasitise the domestic dog in Eastern Australia. 
The most likely species would be Dipylidiwm caninum, 
or pethaps Tenia pisiformis (T. serrata). One probably 
should not take too literally his statement as to the 
agreement of the dingo tapeworm with the hydatid. Again, 
the latter helminth, when present in a canine, generally 
occurs in considerable numbers owing to its mode of 
development from the cystic stage. 
Linguatula dingophila, Johnson, 
This parasite, a female, was found and described by 
Dr. A. Johnson (1910) in the nasal cavity of a pure-bred 
dingo in South Australia. A figure showing the external 
characters was given by him, but no information was 
supplied regarding the anatomy. A comparison of this 
helminth and L. rhinaria (= L. serrata) was given in a 
tabulated form (p. 249), but the only differences of any 
importance in my opinion are those relating to the sizes 
of the adults and of the eggs, and the form of the posterior 
end of the animals. The length of ZL. serrata is given as 
8 to 13 cm.; L. dingophila, 3.1 em., i.e., only about one- 
third as long. The egg of the latter is stated to be .05 mm. 
by .025 mm., whilst that of the former is .09. by .07 mm. 
I suspect that the former egg measurements are incorrect. 
The posterior region of a fully adult female, L. serrata, 
is much more elongate than in L. dingophila, but I believe 
the latter name to be based merely on a specimen of 
L. serrata, which had not attained full size. Dr. Cleland 
and I (1910) found that the larval stage of the latter (often 
called Pentastomum denticulatum in this condition) occurs 
not uncommonly in the mesenteric glands of cattle in 
Sydney slaughter-yards and in the Illawarra district (N.S.W.) 
Dr. Ralph (1865) found it in Victoria as long ago as 1865. 
The parasite almost certainly occurs in Queensland too, 
but has not been definitely recorded as yet. These facts 
are evidence of the presence of the adult in the nasal region 
of dogs in N.S.W. and Victoria at least. I infected the 
nose of a Sydney dog with some of the larve, and later on 
a few adult female pentastomes were obtained from it 
(Johnston, 1911, a, 5). 
