1524 
yOTES ON' AUSTRALIAN* EARTHWORMS, 
occasional exception further apart than the setae of the inner 
couples but not so far apart as the two couples of each side ; the 
inner couples not visible on segment xviii, for some distance both 
in front and behind which segment the setae of the inner couples 
stand a little closer to each other than elsewhere. 
Clitellum compiising eight or even nine segments, xrv-xxi or 
XXII, together with usually some portion of xiii slightly modified ; 
complete all round when well developed, but thinner, especially 
on the last few segments, and of a lighter colour on the ventral 
surface, the inter-segmental grooves here not being altogether 
obliterated as they are laterally and dorsally. The ventral surface 
of XVIII tumid, the swelling extending some way on to the segment 
immediately in front as well as on to the one behind ; a slight 
depression in the median ventral line divides the swollen surface 
into two elevations which cairy the male pores, these about 
corresponding with the intervals between the inner couples of 
setae. Spermathecal pores two pairs, on or immediately behind 
the anterior margins of segments vii and ix, a little ventrad of 
the first row of setae on each side. 
Xephridiopores not \usible. Dorsal pores commence after about 
segment xi. 
Alimentary canal pre.seuts globular dilatations with vascular 
walls in segments ix-xvi, especially in the last three or so of 
these ; but there are no calciferous pouches as in J/. Camdenensis. 
Genitalia : one pair of testes and one pair of ciliated rosettes in 
XI ; one pair of vesiculae seminales in xii ; genital ducts short and 
straight, and immediately behind each of them is a pair of small 
narrow sacs containing several — two in each sac — delicate curved 
ta|>ering penial setae, the longest about 2 mm. long j these are 
probably protruded through the male pores. Spermathecae two 
pairs, the pouches broader and the ducts shorter than in M. 
Camdenensis, each with a rudimentary rosette-like caecum placed 
anteriorly on the very short duct near its exit. 
