694 DR. F. E. BEDDARD OK' 



These characteristics ai^e collectively different from anything 

 met with among the Tetracotylea that is known to me. They 

 are not, however, inconsistent with the conditions known to occur 

 among the Tetraphyllidea, if we may admit the grooves upon the 

 scolex to represent the bothria of such tapeworms. The suckers 

 would then correspond with the small accessory suckers so 

 frequently possessed by these latter worms, and their small size 

 relatively to the scolex would be thus intelligible. The apparently 

 numerous bothria not reducible (by me) to symmetry is suggestive 

 of a type like PhijUobothrium* slightly modified, or perhaps 

 Peltidocotyle t. We cannot, however, place Dasyurotcenia among 

 these Tetraphyllidea on account of the Tetracotylean character of 

 its yolk-gland. But with reference to this gland it may be borne 

 in mind that it is in structure much more diffuse than is usual 

 with the generally solid vitelline gland of the Tetracotylea. 



The genus may be thus defined : — 



Dasyurotsenia, gen. nov. 



Stoutly built worms ivith large scolex hearing four small suckers, 

 of which the inner two bear hooks. No rostellum, hut anterior end 

 of scolex, including hooked stickers, retractile. Segments very 

 short. Inner layer of (longitudinal) muscles very thick, consisting 

 of four to six rows of bundles of fibres. Ventral excretory tubes 

 large, with numerous valves not communicating with each other in 

 the strobila. Dorsal vessels minute, not always visible. Genital 

 pores ttnilateral. Testes mtmerous, chiefly lateral, anterior, and 

 dorsal. Vas deferens with a large coil in middle of segment sur- 

 rounded by prostatic cells ; cirrus sac large, cirrus vnth spinelets. 

 Ovaries with two wings, mediant and posterior and ventral in 

 position, in front of vitelline gland, which is also symmetrical. 

 Shell-gland median, dorsal. Eeceptacuhcm seminis 2}resent, nearly 

 median, ventral. Utertts sac-like, persistent, fills nearly lohole of 

 rip)e proglottid. Eggs ihin-shelled. 



Hab. Marsupials. 



The species I term " robusta" on account of its very stout build. 

 It is, however, quite impossible for me to venture upon an 

 enumeration of the peculiar specific characteristics for the present. 



This genus and species cannot, as I think, be identified with 

 any other form that has been described from an Australian 

 Marsupial. From the present genus we only know a species 

 described by myself § a little time since as A noplotcenia dasyuri. 

 Nor can I identify it with any of the genera enumerated at the 

 beginning of this paper in other Marsupials. In fact, Bertiella is 



* Bronn's ' Thierreicli,' Bd. iv. Cestoiden, pi. xli. fig. 10. 



t Ihid. pi. xliii. fig. 1. 



X Middle line of female apparatus only slightly displaced towards pore side. 



§ P. Z. S. 1911, p. 1003. 



