•68 NOTES ON SOME ENTOZOA 



and form of the rostellar hooks, but it is often a difficult 

 matter to figure these quite accurately, and the differences 

 are small. The general anatomy is similar to that of 

 D. proglottina. 



Citfotcenia hancrofti, n. sp. 



(PL V ; Figs. 42, 45). 

 This large cestode parasitises one of the small wallabies, 

 Onychogale jrenata, specimens having been collected for 

 me by Dr. Bancroft (Burnett River District). The 

 length is about 15 cm. and the maximum breadth 14 mm. 

 The unarmed scolex is large, being 1-9 in diameter, and 

 bears four powerful suckers, each about -72 mm. in 

 diameter. There is no unsegmented neck region, the 

 strobila consisting of very numerous narrow leaf-like 

 segments, which graduall}^ increase in length and breadth 

 as they pass backwards. The genital papilla lies in the 

 posterior half of each margin. 



The longitudinal musculature is .very powerful, con- 

 sisting of a broad zone of bundles lying in the inner portion 

 of the cortex, the outer portion being free from them. The 

 bundles on the outer edge of the zone are smaller than 

 those lying nearer the well- developed transverse muscles. 

 Dorso- ventral fibres are abundant. The dorsal excretory 

 vessel is a small tube situated laterally from the larger 

 ventral canal. The nerve lies just above, or at times 

 dorso- laterally to, the dorsal vessel. The sex canals pass 

 above both the excretory canals and the nerve, the male duct 

 lying above the vagina. Both sex canals terminate in a 

 common genital chamber which communicates with the 

 exterior through the genital pore. 



Testes were not distinguishable in the specimens. 

 There is a large cirrus sac in each half of the segment. Its 

 length when the cirrus is at rest, is from -8 to 1 mm., and 

 the breadth -019 mm. It possesses relatively thick muscular 

 walls. The vas deferens forms a small closely- coiled mass 

 near the inner end of sac, and after entering the latter, 

 enlarges to form a vesicula seminahs. The cirrus may be 

 everted to a distance of '30 mm. beyond the genital pore. 

 It then appears as a wide organ (-14 mm. in width), covered 

 with very numerous tiny spines so closely set as to give 

 a stippled appearance. 



