48 Proceedings of the Royal Society of Victoria. 



Male pores on well-marked small papilhe placed (in spirit 

 specimens) in a depression at or very slightly within the level of 

 the innermost sette of each side. 



Oviduct pores on segment 14. 



Spemiiathecal pores. Five pairs between segments 4 and 5, 

 5 and 6, 6 and 7, 7 and 8, 8 and 9, at the level of 



Accessory copulatory structures. Median ventral elliptical 

 patches on segments 9, 10, 11. 19, 20, 21 and 22. 



Dorsal pores present, the tirst between segments 4 and 5. 



Alimentary canal. Gizzard in segment 5. Three pairs of 

 calciferous glands present in 10, 11 and 12. Large intestine 

 commencing in segment 18. 



Circulatory system. Dorsal vessel single. Hearts in segments 

 6-12. In segments 10-12 they arise from the supra-intestinal 

 vessel. 



Excretory system. Plectonephric : no large nephridia present. 

 Attached to the walls of the alimentary canal in the first four 

 segments are peptonephridial (?) glands. 



Reproductive system. Testes, two pairs, in segments 10 and 11 

 with rosettes in the same segments. 



Prostates flattened and bilobed, but with a single duct in 

 segment IS. 



Sperm sacs, I'acemose in segments 9 and 12. 



Ovaries in segment 13 with oviducts opening into the same 

 segment. 



Spermathecse, five pairs, in segments 5, 6, 7, 8 and 9. Each 

 consisting of a sac with a diverticulum slightly longer than the 

 sac and with a swollen extremity. 



Habitat. Emu Bay, Tasmania, and King Island in Bass 

 Straits. 



This form is a member of the group to which belong also 

 P. rubra, P. frenchii, P. hoggii, P. sylvatica, P. steeli and P. hatli, 

 all of which are closely allied to one another and agi-ee in the 

 possession of a median ventral cleft on the peristomium, in 

 having five pairs of spermatheca?, in having three pairs of true 

 calciferous glands in segments 10, 11 and 12, in having a 

 plectonephric excretory system, and in having the prostate 

 bilobed. 



