DESCRIPTIONS OF GENERA AND SPECIES 373 



(i) Megascolex stirlingi (Fletcher). 

 Perichaeta stirlingi, Fletohee, Proc. Linn. Soc. N. S. W. (a), vol. ii, 1887, p. 395. 



Definition. Length, 320 mm.; breadth, 10 mm.; number of segments, 300. CUtellum 

 XIII-XFII. Setae, zo—^o ; fewest anteriorly. Genital papillae : a pair on XFI/XVII- 

 XXIII/XXIV ; the anterior pair closer together than those further back. First dorsal pore, 

 IT IV. Calciferous glands, globular diverticula in VIII-XIV ; intestine begins in XVIII. 

 First septum, IV/V ; VI/XIV thickened. Last jpair of hearts in XIII. Sperm-sacs in 

 XI, XII. Egg-sacs in XIII, XIV, the latter smaller. Spermathecae in VII-IX, opening in 

 line with setae 4/5 or 5/6, with short, club-shaped caeciim. Spermiducal glands, ' long, 

 narrow, rather flat,' with long or short genital duct. Hab. — Adelaide, N. S. Wales. 



The oviducal pore is described as being single. See also Fletcher (6). 



(2) Megascolex raymondianus (Fletcher). 

 Perichaeta raymondiana, Fletcher, ibid., p. 398. 



Definition. Length, 2,60 mm.; breadth, 9 mm.; numJier of segments, 135. CUtellum, 

 XIII-XVII. Setae, a8, increasing posteriorly to ofi, on anterior segments twice as long 

 as in posterior. Genital papillae ellipsoidal on ventral line of XVII, XVIII. First dorsal 

 pore, V/VI. Septa VI/XV thickened. Other characters as in M. austrinus. Hab. — 

 Raymond Terrace, Hunter River, N. S. Wales. 



(3) Megascolex hamiltoni (Fletcher). 



Perichaeta hamiltoni, Fletcher, ibid., p. 399. 

 Definition. Length, 14^ mm.; breadth, ^mm.; number of segments, 148. Setae twice as long 

 anteriorly, i6 in first setigerous segment behind clitellum, 28-36. Genital papillae as 

 a swelling on ventral surface of XVII-XIX, also papillae with pores on XVII, XVIII. 

 Other characters as in M. austrinus. Hab. — Guntawang, N. S. Wales. 



(4) Megascolex exiguus (Fletcher). 

 Perichaeta exigua, Fletcher, ibid., p. 387. 

 Definition. Length, 60 mm.; breadth 3-5 mm.; number of segments, 115. Clitellum, 

 XIV-XVII. Setae, ao-30. Male pores on line with third seta. Genital papillae: 

 ventral thickenings on X, XI ; on some or all of segments XVI, XVII, XIX, XX, paired 



