DESCRIPTIONS OF GENERA AND SPECIES 543 



(19) Acanthodrilus macleayi, FLETCHER. 

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



Definition. Length, 27 mm. ; diameter, Z mm,; number of segments, 90. Prostomium 

 prolonged over less than half the buccal segment. Clitettum, XII XVI (XVII]. Setae 

 strictly paired. Papillae large, median swellings on XVI, 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.' Hob. 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 

 Acanthodrilus. 



(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. Prostomium 

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

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

 XII/X1II, XVIII/XIX, between ventral 'and lateral pairs of setae. Gizzard in segment VI. 

 Nepfiridiopores 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. Penial setae particularly long, 2'4 mm., not ornamented. 

 Hub. Cape York, Australia. 



(21) Acanthodrilus schmardae, BEDDAKD. 



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



Definition. Length, 60 mm.; diameter, $ mm. Clitellum, XII-XVII, incomplete. Dorsal pores 

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

 much larger than those which f Mow. Penial setae with ornamentation. Spermathecae with 

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

 in the neighbourhood of the Spermathecae ; one pair of these glands behind lust pair of 

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

 Setae not ornamented. Hob. RocMamptott, Queensland (fresh water). 



