34 RECORDS OF THE AUSTKALIAN MUSEUM. 



besides, no eggs were present in them. Owing to the presence 

 of very deep intersegmental constrictions, there is considerable 

 overlapping, the proglottids being somewhat bell-like. The 

 corrugated appearance noted by Dujardin and by Ransom is 

 evident. Lying unilaterally in the posterior half of each segment, 

 is the genital pore situated on a slight projection. 



Sections were not cut, hence the relations of the muscular and 

 subcuticular structures were not followed out. Ransom gives a 

 detailed account of the nervous and excretory systems. The 

 main vessels of the latter system are to be recognised in the 

 segments, their arrangement being indicated in PI. vi., figs. 2 

 and 3. The sex ducts pass above both excretory canals and the 

 longitudinal nerve. Calcareous corpuscles are very abundant 

 in the cortical tissue. 



Male Genitalia. — The three testes lie in the posterior half of 

 the segment, one being situated on the pore bearing side and the 

 other two on the other side of the median line. Their arrange- 

 ment varies somewhat as may be seen on comparing their position 

 in PI. vi., figs. 2 and 3, their disposition in fig. 2 resembling that 

 drawn by Ransom. The vas deferens is a short thick, somewhat 

 swollen tube passing forwards to enter the cirrus sac within 

 which it becomes considerably swollen to form an elongate, rather 

 wide, thin-walled inner vesicula seminalis, occupying the major 

 portion of the inner half of the sac. Fz*om the outer end of this 

 vesicle a narrow duct passes inwards towards the inner end of 

 the cirrus sac, to bend round and again travel outwards as the 

 cirrus which may or may not lie somewhat coiled within the sac. 

 The inner wall of the cirrus carries a great number of closely 

 set bristles which in the everted organ, project backwards. The 

 cirrus can be protruded to a distance of at least 016 mm. The 

 sac is relatively very long, being from - 3 to nearly 05 mm. in 

 length, the breadth being - 04 mm. in its outer part and 006 mm. 

 in its inner portion. Its inner extremity lies postero-dorsally to 

 the ovary, the sac extending from this region postero-laterally 

 in front of the vitelline and shell glands and above the vagina to 

 terminate at the male pore. The latter opens into the narrow 

 genital cloaca just above and behind the female pore. 



Female Genitalia. — The ovary is a comparatively large, solid 

 gland lying ventrally in the extreme anterior portion of the 

 segment. It frequently possesses an irregularly bilobed shape. 

 Behind it is the small compact vitelline gland which overlies the 

 shell gland dorsally. 



