1550 
NOTES ON AUSTRALIAN EARTHWORMS, 
about segments xx to L, its floor presents four conspicuous longitu- 
dinal ridge-like folds, two on either side of the median line. 
Genitalia : one pair of testes and one pair of ciliated rosettes in 
segment xi ; a single pair of racemose vesiculae seminales in xii, 
attached to the posterior face of the mesentery between this and 
the preceding segment ; the prostates are in xviii and xix : two 
pairs of spermathecae in viii and ix, pouches with rather short 
duct, each with a single rather rudimentary club-shaped caecum 
placed on the inner side of the duct near its exit. 
Internally there are white swellings corresponding with the 
genital papillae. The last pair of hearts in segment xii. 
Xephridia are minute tubules attached to the coelomic wall at 
intervals forming about flve longitudinal rows on each side of the 
body. 
Mesenteries from the anterior one of vi to the anterior one of 
XII are thicker than the others. 
Hab. — Burrawang, N.S.W. 
PERICH.ETA INDISSIMILIS, n.Sp. 
Twenty-seven spirit specimens (very successfully killed in an 
almost fully extended condition) of various stages are from 
5-11 cm. long, and 2-3 mm. broad; number of segments from 
about 90-110, 
Colour purplish-red above, darkest in the anterior region ; paler 
below. 
Prostomium nearly divides (about f or a Little more) the buccal 
ring ; the latter usually grooved from V>efore backwards in the 
median ventral line. 
Setae at first 20 per segment, increasing about xiii to 24, and 
still further back to 26-30, or rarely a few more. 
Clitellum present in only one specimen and only then partially 
developed, comprising segments xiv-xvi. 
