BY J. J. FLETCHER, M.A., B.SC. 389 



The last pair of hearts is in segment xii, the posterior three 

 pairs much lai'ger than the others. 



Hah. — Springwood (Blue Mts.), Randwick and Manly Beach 

 (near Sydney), N.S.W. 



The specimens from these three localities agree very well except 

 in regard to the accessory copulatory structures, which by them- 

 selves are of too variable a character to be relied on for purposes 

 of classification. I therefore put them all in one species, though 

 when more specimens are examined it may be possible to separate 

 one or more varieties. 



The only other worms with a single pair of spermathecae that I 

 have seen, were sent to me by Mr. T. Gr. Sloane from Mulwala on 

 the Murray. They comprise six (spirit) specimens from 54-91 mm. 

 long, and 2-3 mm. broad, consisting of from 88-125 segments. 

 They are not sufficiently well-preserved for very satisfactory 

 determination, nevertheless I have been able to make out that they 

 are closely allied to the above-described species but may be distin- 

 guished as 



Var. MURRAYANA, 



Differing from the typical form of P. exigua in having (1) the cgeca 

 of the spermathecae very long, almost filiform but slightly dilated 

 distally, much longer than the principal pouches, (2) the testes in 

 IX and XII instead of in consecutive segments, (3) the prostates 

 narrower, less incised ; and the genital ducts shorter, thicker, and 

 less markedly bent in horse-shoe fashion. There are also 

 slight diff'erences in the details of the accessory copulatory struc- 

 tures, in regard to which however the specimens differ among 

 themselves. 



Eab.—Mulwixla, N.S.W. 



Mr. Sloane tells me that this species is common in spring about 

 the edges of lagoons and marshes after the floods in the Murray 

 subside, but is scarce at other seasons when the ground becomes 

 dry. 



