DESCRIPTIONS OF GENERA AND SPECIES 483 



(i) Trinephrus fastigatus (FLETCHEB). 

 Cryptodrilus fastigatus, FLETCHER, Proc. Linn. Soc. N. S. W.(a), iii, 1889, p. 1541. 



Definition. Length, 89 mm. ; diameter, 4 mm.; number of segments, 140. Prostomium 

 completely dividing buccal ring. Clitellum, XIV-XVII complete. Setae of outer couples 

 further apart than of inner couples. Male pores opposite frst seta ; ventral surface of 

 segment XVIII tumid. Oviduct pores in front and ventrad of seta I. Dorsal pores 

 commence between IT/V. Gizzard in V; large intestine begins in XVIII. Sperm-sacs in 

 XI, XII. Spermathecae in VIII, IX, with two caeca. Spermiducal glands four, two 

 of each side unite before opening. Last hearts in XII. Hob. Burrawang anil Illawarra, 

 N. S. Wales. 



FLETCHER describes what appear to be egg-sacs in segments xiii and xiv. The 

 spermiducal glands occupy respectively segments xviii and xix-xxi ; the ducts of 

 the two of each side unite to form a single duct which is bent upon itself; the 

 sperm-duct joins the ducts of these glands just after their union. In one specimen 

 the last pair of hearts was in segment xiii. 



(2) Trinephrus tennis (FLETCHER). 

 Cryptodrilus tenuis, FLETCHER, loc. cit., p. 1543. 



Definition. Length, 90 mm.; diameter, 4 mm.; number of segments, 190. Prostomium 



complete. Setae of outer couples further away than of inner. Male pores between setae 



of inner couples. Spermathecae with a single rather rudimentary caecum. Spermiducal 



glands single on each side and tubular. Hab. Braidwood, N. S. TV. 



This species is, owing to the immaturity of the examples, incompletely described 



by FLETCHER ; in addition to the points noticed in the above, he says that the dorsal 



pores commence further forward than in the last species ; it also has a much paler 



colour. 



(3) Trinephrus mediocris (FLETCHEK). 

 Cryptodrilus mediocris, FLETCHER, loc. cit., p. 1544. 



Definition. Length, 65 mm. ; diameter, 3-5 mm.; number of segments, 125. Prostomium does 

 not divide buccal ring. Setae of outer couple further apart than of inner. Clitellum, 

 XIII-XVII, complete. Male pores just dorsad of setae I ; between X/XI a pair 

 of papillae; similar pairs between XV/XVI, XVI/XVII, XIX/XX, XX/XXI ; also a pair 

 on XVII or XVIII. Dorsal pores commence XT/XII. Gizzard in V , intestine begins in 



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