DESCRIPTIONS OF GENERA AND SPECIES 543 



(19) Acanthodrilus macleayi, Fletcher. 



A. Macleayi, Fletcheb, Proc. Linn. Soc. N. S. W., iv (2), 1890, p. 999. 



Deflnition. Lengthy 27 mm. ; diameter, 3 mm. ; number of segments, 90. Frostomium 

 prolonged over less than half the buccal segment. Glitellum, XII-XVI [XVII). Setae 

 strictly paired. Papillae large, median swellings on XFI, XVII, and a few following 

 segments. Male pores ventral of the position of the first setae. Penial setae flattened 

 at free extremity, ' minutely notched distally.' Hal. — Napier Range, N. W. Australia. 



Fletcher is not quite clear as to the sperm-sacs, which, according to him, lie in 

 X, xii. The alimentary canal has a gizzard. This is the smallest species of 

 AcanthodrUus. 



(20) Acanthodrilus australis, Michaelsen. 



A. australis, Michaelsen, JB. Hamb. wiss. Anst., vi, 1889, p. 9. 



Definition. Length, 140 mm.; diameter, 6 mm.; number of segments, 443. Frostomium 

 does not divide buccal segment. Glitellum, XIII-XIX. Setae strictly paired. Dorsal 

 pores appear to commence XII/XIII. Papillae in pairs on intersegmental furrows, XI/XII, 

 Xn/XlII, XFIII/XIX, between ventral and lateral pairs of setae. Gizzard in segment VI. 

 Nephridiopores in front of dorsal setae. Male and spermathecal pores in line with 

 ventral pair of setae. Sperm-sacs in X, XI, XII. Spermathecae with minute diverticula 

 concealed in the walls of the duct. Fenial setae particularly long, 2,'4 mm., not ornamented. 

 Hah. — Gape York, Australia. 



(21) Acanthodrilus schmardae, Bbddard. 



A. Schmardae, Beddard, Ann. and Mag. Nat. Hist., Feb., 1892, p. 132. 



Definition. Length, 60 mm.; diameter, ^ mm. Glitellum, XII-XVII, incomplete. Dorsal pores 

 present. After gizzard are five thickened septa. Anterior pair of spermiducal glands are 

 much larger than those which follow. Fenial setae with ornamentation. Spermathecae with 

 an inconspicuous diverticulum ; posterior pair the larger. Gopulatory glands and setae 

 in the neighbourhood of the spermathecae ; one pair of these glands behind last pair of 

 spermathecae and a sac of copulatory setae between them ; a second pair behind these. 

 Setae not ornamented. Hab. — B,ockhampton, (Queensland (^fresh water). 



