l!54 HMCORDS OF THK AUSTKALIAX MUSIiUM. 



;dthough I liad seen it aiul sketclied it in glycerine mounts,' I am 

 totally unable to detect it in an individual stained and mounted 

 in Canada balsam, although the worm is mature. In sections 

 the chaita is seen to be solid and without a grocjve, such as exists 

 in some species. 



Tlie Clitelhim covers the segments x., xi., xii. The male pores 

 and spermatliecal pores occupy the usual position in segments xi. 

 and X. respectively : the spermathecal pore is situated just 

 ■posterior to tlie "copulatory clueta. " 



lNTf:KXAL Ax ATOM V : 



Rpprodnctivt' Sijsti'iu. — Tlie testes and ovaries occupy the usual 

 segments, and the sperm sacs occur in segments x. to xiii. The 

 male-apparatus is constructed as follows : — The Hat sperm funnel, 

 lying in the tenth segment, against the anterior face of its 

 posterior septum, leads into a delicate sperm duct, which after 

 entering the eleventh segment, is somewhat coiled, or at least un- 

 <lulating, and passes upwards to enter the "atrium" near the 

 dorsal sui'face of this segment. The atrium has the usual retort- 

 shape of Tubificids generally, with its wider end upwards, into 

 which there open the sperm duct and the moderate sized prostate 

 (PI. xlvi., fig. 5). The atrial duct then passes almost straight 

 downwards to the \entral surface, piercing a small penis, which 

 projects into a small penial sac or chamber, opening to the 

 exterior by the male pore. There is no chitinous sheath to this 

 penis, and the entire apparatus is confined to the segmerit xi. 



The spermatheca, on either side of segment x., consists of an 

 ovoid or cylindrical "ampulla"' with very muscular wall, and a 

 narrow duct about lialf tlie length of the ampulla (PL xlvi., fig. 6). 

 The circular muscles of the ampulla are very strongly developed 

 to form distinct rings. As above mentioned, the spermathecal 

 pore is just behind the copulatory clipeta of each side. 



T find no spermatoj^hores, but that is not to say that these are 

 not formed by this species. As a matter of fact, I could not 

 <letect any spermatzoa in any of the mature individuals studied, 

 and unfortunately, the .specimen sectionised turned out tO be in- 

 completely developed. The sexual organs are present, but not 

 fully formed, and still more unfortunately I cannot find any other 

 niatui'e individual suitable for sectionising. 



^ Tlie quantity of sand-grains in tlie intestine, and the soft condition of the 

 body, rendered the investigation of llie clia'tjt rather difficidt. As 

 compression caused the intestine to burst, and the sand-grains by their 

 ret'riii<ienev interfered Avith the stiidv of these structures. 



