DESCRIPTIONS OF GENERA AND SPECIES 373 



(i) Megascolex Stirling! (FLETCHER). 

 Perichaeta stirlingi, FLETCHER, Proc. Linn. Soc. N. S.W. (2), vol. ii, 1887, p. 395. 



Definition. Length, 220 mm.; breadth, 10 mm.; number of segments, 200. Clitcllum 

 XIII-XVII. Setae, 20-40 ; fewest anteriorly. Genital papillae : a pair on XVI/XVII- 

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

 IV/V. Calciferous glands, globular divcrticula in VIII-XIV ; intestine begins in XVIII. 

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

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

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

 narrow, rather flat,' with long or short genital duct. Hal. 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, 260 mm. ; breadth, 9 mm.; number of segments, 135. Clitellum, 

 XIII-XVII. Setae, 28, increasing posteriorly to 36, 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. Hal. 

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



(3) Megascolex hamiltoni (FLETCHER). 



Perichaeta hamiltoni, FLETCHER, ibid., p. 399. 



Definition. Length, 143 mm.; breadth, ^ mm.; number of segment*, 148. Setae twice as long 

 anteriorly, 16 in first setigerous segment behind clitellum, 28-36. Genital papillae as 

 a swelling on ventral surface of XVII-X1X, also papillae with pores on XVII, XVIII. 

 Other characters as in M. austrinus. Hal. Guntatcang, N. S. Wales. 



(4) Megascolex exiguus (FLETCHER). 

 Porichaeta exigua, FLETCHER, ibid., p. 387. 



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

 XIV-XVIL Setae, 20-30. Male pores on line with third seta. Genital papillae: 

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



