376 OLIGOCHAETA 



the type in having only two pairs of spermathecae in viii, ix ; there is an additional 

 ' raised area ' on xvi. 



(10) Megascolex indissimilis (FLETCHER). 

 Perichaeta indissimilis, FLETCHER, ibid. (2), vol. iii, p. 1550. 



Definition. Length, no mm.; breadth, 3 mm.; number of segments, no. Clitellum, 

 XIV-XVI. Setae, 20-34 in front of the clitellum, 26-30 behind. Genital papillae on 

 VII-X, XVII, XIX-XXIII. First dorsal pore, IV- V. Calciferous glands, X-XII. 

 Sperm-sacs in IX, XII. Spermathecae usually two pairs in VIII, IX (one or two additional 

 pairs sometimes present^, with caeca as long as pouch, llab. Shores of Lake Alexandria, 

 South Australia. 



(n) Megascolex macleayi (FLETCHER). 

 Perichaeta macleayi, FLETCHER, ibid., p. 1556. 



Definition. Length, 90 mm. ; breadth, 4-3 mm. ; number of segments, 90. Clitellum, 

 XIII-XFII. Setae, 20-28. Genital setae, a pair on XVII, XIX ; a pair of ' sioellings ' 

 on X, XI. First dorsal pore, VVI. Two pairs of calciferons glands in XI, XII. Other 

 characters as in M. australis. Hab. Sydney. 



Besides the type specimens of which the above is a description, FLETCHER subse- 

 quently [6] received others from Mount Wilson, Lawson, Burrawang, Mount Victoria, 

 Raymond Terrace and Morpeth, Coonabarabran. 



These showed slight differences, to which, however, names have not been given. 

 The only differences concern the measurements and the arrangement of the genital 

 papillae ; there are frequently papillae upon xvi and upon xx and xxi. 



12) Megascolex dorsalis (FLETCHER). 

 Perichaeta dorsalis, FLETCHER, ibid. (2), vol. ii, p. 618. 



Definition. Length, 192 mm. ; breadth, 7 mm.; number of segments, 135. Clitellum, 

 XIV-XVII. Setae, 16-30. Dorsal pores commence, IV V. Genital papillae paired on 

 X, XVII. Gizzard in V (or VI?); from TIII-XIV ghbular calciferous glands ; intestine 

 begins in XVII. Last pair of hearts in XIII. Septa VIII-XIV thickened. Sperm-sacs 

 in IX, XI, XII. Egg-sacs in XIII, XIV. Spermathecae in VI-IX, opening in line with 

 seta 8 or 10, with caecum longer than pouch. Spermiducal glands with long f-sJiafed 

 duct (eversible). Hab. Eltham, Gippsland, Victoria. 



In this species the oviducal pore, as in M. stirlingi, is single and median. Of 



