250 RECORDS OF THIS AUSTRALIAN MUSEUM. 



vesicles as in Dipyliclium caninum, Linn. These pouches 

 become tilled with ova, and lose their connection with the rest of 

 the female system by the abortion of the uterus. Thus the ova 

 are seen in section in small groups lying in a small capsule in the 

 parenchyma. The testes have become atrophied long before this, 

 the cirrus sac being the only male structure still persisting. The 

 segment becomes so full of eggs tliat not only is the medulla 

 crammed with them, but the lateral fields becomes almost obliter- 

 ated, ova being present laterally beyond the excretory canals 

 close up to the cuticle. The longitudinal muscle bundles persist 

 in ripe segments. 



The eggs are spherical, excepting where crowded, and then 

 they become polygonal through mutual pressure. Two shells are 

 present and are fairly widely separated. The diameter of the 

 embryo is eighteen /x, that of the outer shell being twenty-six p. 

 The arrangement of the booklets in the onchosphere is illustrated 

 on PI. lxx., tig. 8. Each hooklet is 0*017 mm long and appears 

 to possess a slightly swollen extremity. 



The Cestode belongs to the family of Dilepinidse and to the 

 sub-family Dipylidiime (Prof. Fuhrmann's 1 classification, 1908). 

 Its characters are such that they may be regarded as belonging to 

 a new generic type. I accordingly propose the name Similuncinus 

 dacelonis, gen. et. sp. nov., the generic name referring to the 

 possession of hooks all similar in shape. 



The characters of the proposed genus may he stated provision- 

 ally, as follows : — Retractile rostellum bearing a single circlet of 

 uniform hooks; four unarmed suckers; unilateral genital pores ; 

 genital papilla not prominent; single genitalia; numerous testes 

 mainly situated behind the ovary; ovary in the anterior part of the 

 segment ; uterus a reticulum surrounding the testes at first, but 

 afterwards becoming aborted so that the eggs lie in the masses 

 surrounded by the parenchyma; the genital ducts pass ventrally 

 to longitudinal nerve and excretory canals. 



This new genus would differ from Dipylidium, R. Lckt., in 

 possessing only one row of uniform hooks and single genitalia ; 

 from Monopylidium, Fuhrmann, in the structure of the rostellum 

 and the position of the sex canals in regard to the excretory 

 system ; from all genera in the sub family Dilepininse in the 

 character of the uterus. 



Type presented to the Trustees of the Australian Museum. 



■Fuhrmann— Die Cestoden der Viigel (Zool. Jahrb., x., Suppl. B<3., I, 

 I "08, p. 27). 



