PROTEOCEPHALUS GALLARDI. \Q\ 
become more or less displaced and soon atrophy, the testes being 
the first to disappear. The mature organ consists of a rather long, 
narrow, median trunk with extensive lateral cavities arranged 
more or less at right angles to it, the appearance being somewhat 
like that found in the genus Tcenia sensu stricto. The lateral 
pouches are not subdivided. Sometimes the uterus becomes so 
densely packed with eggs that one cannot recognise the presence 
of poucheis, the organ then resembling a large simple sac such as is 
found in Dilepis and allied Taeniae! genera. The eggs are spherical, 
possessing two shells, the diameter of the outer being 0.039 mm., 
that of the inner, which closely invests the embryo, being 0.0156 
mm. The embryonal booklets measure 0.0084 mm. in length. 
The only other species of Proteocephalus known from Australia 
are P. tidswelli, Johnston,* taken from the monitor lizard 
V aranus varius, Shaw, in different parts of New South Wales, and 
Proteocephalus sp. (recorded as Ichthyotcenia sp.)f from the copper- 
headed snake Denisonia superha, also from that State. Two forms 
were described from Varan us sp., f rom New Guinea, by Ratz,| 
under Ichthyotcenia — viz., P. hiroi and P. saccifera. All three 
described forms, a>s well as P. cjalhirdi, come under the subgenus 
Acanthotcenia.% 
Linstow,|| in 1907, in describing P. pigmentosa (I. pigmentata, 
Linst.), from the intestine of Psammodynastes pulverulentus^ 
Fisch., gives a list of the Ta?niad cestodes known from snakes, 
remarking that nearly all of them belong to the genus Ichthyo- 
tcenia. Schwarz^ has recently published a paper on the Ichthyo- 
taeniae of reptiles, in which he enumerates the known species, and 
offers observations on the anatomy of some of the species. The life 
history of members of the group is not known, though Barbieri*"* 
regards it as being very probable that the plerocercoid stage of the 
various species infesting Teleo'Steans occurs in certain Crustacea 
such as Leptodora and Bythotrephes. 
* Johnston, Jour. Proc. Roy. Soo. N.S.W. xliii, 1909, p. 103-116. 
f Johnston, Ibid. 1910, p. xViii. 
X Ratz, C. R. Soc. Biol. Hi, 1900, p. 980-1 ; Centr. f. Bakt. xxviii, 1900, p. 657-660. 
§ Johnston, Jour. Proo. Roy. Soc. N. S. Wales 1910, p. 114-5. 
|| Linstow, Notes fr\>m the Leyden Museum, xxix, 1907, p. 85-6. 
TT Sohwarz, Die Ichthyotaenien der Reptilien, etc. Inaug. Diss. Basel. 1908 3 
p. 1-52; Ref. in Zoolog. Zentralb. xvi, Dec. 1909, p. S01. 
** Barbieri, Centr. f. Bakt. Grig. I., xlk, 1901), p. 334-341. 
