486 OLIGOCHAETA 



(4) Digaster excavata (FLETCHER). 



Perissogaster excavata, FLETCHER, loc. cit., ii. (2), 1888, p. 383. 



Definition. Length, 334 mm.; breadth, 15 mm. ; number of segments, 195. Prostomium 

 incomplete. Clitellum, XIII-XVIII, complete except for three fossae in front of behind 

 enclosing male pores. Setae in eight rows ; those of outer couple further apart than 

 inner. Oviducal pores 2 mm. apart. Dorsal pores absent. Gizzards, three in V-VII ; 

 no distinct calciferous glands ; intestine begins in XVI, arranged in a spiral. Septa, 

 VII/XIV, thickened. Last pair of hearts in XII. Sperm-sacs in IX, XII ; sperm- 

 reservoirs in X, XI. Spermathecae in VIII, IX, with bifid or trifid diverticulum, opening 

 in line with seta 1. Ilab. Morpeth, Hawkesbury river, N. S. W. 



(5) Digaster nemoralis (FLETCHER). 

 Perissogaster nemoralis, FLETCHER, loc. cit., iii (2), 1889, p. 1527. 



Definition. Length, 130 mm.; breadth, 6mm.; number of segments, 245. Prostomium incom- 

 plete. Setae in eight rows, outer couple further apart than inner. Clitellum, XIII-XVII1, 

 complete, except where papillae occupy ventral space. Male pores in line with, interval 

 between setae one and two. Genital papillae, two pairs, between XVI/XVII, XVIII/XIX. 

 Dorsal pores begin X/XI. Gizzards, three in V-VII ; calciferous glands in XXIV; 

 intestine begins in XVII ; it has a typhlosole. Last pair of hearts in XIII. Sperm-sacs 

 in IX, XI, XII. Spermathecae in VIII, IX, with short diverticulum. Penial setae 

 present. Peptonephridia in IV. Hob. Gosford, N. S. W. 



(6) Digaster armifera, FLETCHER. 

 D. armifera, FLETCHER, loc. cit. i (2), 1887, p. 947. 



Definition. Length, 125 mm. ; diameter. 5 mm.; number of segments, 205. Prostomium 

 incomplete. Clitellum, XIV-XVII. Setae of outer couples further apart titan of inner. 

 Papillae a swollen ridge on XVII, XIX and XI, XII. Dorsal pores commence XII/XIII. 

 Gizzards two in V, VI ; intestine begins in XVII. Anterior nephridia modified into 

 peptonephridia. Last hearts in XII. Anterior septa up to XII/XIII thickened. Sperm- 

 sacs in XI, XII. Spermathecae in VIII, IX, with rudimentary caecum. Penial setae, 

 extremity ornamented with circular serrated ridges. Hob. Marrickville, near Sydney, 

 Auburn, near Paramatta, N. S. W. 

 With some doubt FLETCHER refers some species from Percy Island to the same 



species. The characters of these were insufficiently defined to permit of certainty in 



the matter. 



