'612 NOTES ON AUSTRALIAN EARTHWORMS, 



Prostomiiim broad, slightly depressed, only partially dividing the 

 buccal ring (about half). Segments ll-iv biannulate, after which 

 they are tri-annulate, the anterior annular groove for a few seg- 

 ments less conspicuous. 



Setfe in eight longitudinal rows, forming four series of couples ; 

 the two innermost rows about 3 mm. apart ; the second row on each 

 side slightly less than 1 mm. from the first ; the third about 2 mm. 

 from the second ; the fourth about 1 mm. from the third, the 

 distance between these slightly greater than that between the 

 setae of the first couple. 



Clitellum (in one case) commences with xiii, (the anterior 

 or even this and the median annuli not included in all of 

 them) and includes the first and second annuli of xviil (pro- 

 bably the whole of this segment when the worms are breed- 

 ing), thick and complete all round except for the fossae on 

 its posterior ventral portion ; absent altogether in some of the 

 specimens, and among some of the others in various stages of 

 development as regards thickness, and the amount of xiii included 

 in it. In specimens in which the girdle is not fully developed on 

 the ventral surface of the anterior annuli of segments xvii-xxii 

 there is a dumb-bell-shaped fossa extending outwards a little 

 beyond the inner couple of setfe on each side ; in worms in which 

 the girdle is better developed these areas come to occupy nearly 

 the whole breadth (from before backwards) of the segments, their 

 rims are thickened and in each of the large extremities there is a 

 papilla probably with a pore ; the second and third of these fossae 

 do not extend so far outwards as the others and their extremi 

 ties become confluent, leaving a central eminence. 



Male pores on two slight papillae on the middle annulus of xviil, 

 not conspicuous (in my specimens), about in line with the intervals 

 between the inner couples of setae. Oviduct pores two, in front 

 and ventrad of the first seta on each side. 



Spermathecal pores two pairs, close to the posterior borders of the 

 anterior annuli of viii and ix, just dorsad and in front of the fii'st 

 seta on each side. 



