BY J. J. FLETCHER. 
1531 
three parallel modified surfaces, but -with the important difference 
that in D. armifera each of these is the ventral surface of one> 
the three segments with the tri-annulate subdivision effaced, these 
remaining independent of one another ; while in D. Perrieri the 
middle one is the middle annulus of xviii, the other two being 
intersegmental, taking in one annulus of each of the two segments 
between which they occur : the two pairs of vesiculse seminales 
are in consecutive segments xi and xii : the penial setse are of a 
different shape, the tips slightly bent inwards, but not cleft, below 
which for a short distance they are minutely serrate, but not 
swollen. 
Hah. — Springwood, Blue Mts., N.S.W. 
D. lumhricoides, Perr., has a girdle of three segments, xiv-xvi, 
and the dorsal pores commence after segment iv {vide figs. 64 and 
65, and the explanation of them, in Perrier’s monogi’aph, Nouv. 
Arch, du Mus., Paris, viii, 1872, p. 197) ; moreover, he says of it 
that the disposition of the setae is that of true Lombrics, and {l.c. 
p. 145) “ point d’appaieil copulateur.” Both D. armifera and D. 
Perrieri have at least segment xvii, [and in some recently obtained 
fine specimens of the former in addition half or two-thirds of xiii 
and about the anterior annulus of xviii except ventrally] included 
in the clitellum ; the dor.sal pores commence after about segment 
X or XI ; the setae of the outer couples are further apart than 
those of the inner ones ; and both have penial setae. 
This variation in species of the same genus, in characters which 
at the commencement of one’s investigations when dealing with a 
single or only a few species, one is apt to regard as of more than 
specific importance, is exemplified in the case of other Australian 
genera. 
Perrier (in the explanation of fig. 64, l.c. p. 197) says that in 
1\ lumbricoidea the two male pores are preceded and succeeded by 
a pair of ]>apill 0 e, as in the case of .some species of Perichoifa. In 
D. Perrieri, especially in worms without girdles, it is evident that 
the three modified surfaces aVjove-rnentioned consist of three pairs 
