DESCRIPTIONS OF GENERA AND SPECIES 551 



It will be observed from this table that 0. huttoni agrees with 0. multiporus 

 in one (possibly two or three is the position of first dorsal pore and penial setae), 

 with 0. antarcticus in two characters also, while it differs from both in two characters, 

 to which should be perhaps added a third, for the male pores are borne at the top 

 of very unusually pronounced papillae. These papillae are more developed in those 

 Acanthodrilidae which have no penial setae, but they seem to be most conspicuous in 

 0. huttoni. 



The genus is absolutely confined to New Zealand. 



(i) Octochaetus multiporus, BEDDAKD. 



Acanthodrilus multiporus, BEDDAKD, P. Z. S., 1885, p. 813. 

 O. multiporus, BEDDAKD, P. Z. S., 1892, p. 674. 



Definition. Length, up to \A,\ inches; breadth (at clitelluni), 13 mm. ; number of 

 segments, 238. Colour during life, pink; clitellum, white. Clitellum, XIII-XX. 

 Dorsal pores present. Gizzard in V and VI or VI alone. Caleiferous glands (one 

 pair) in XVII (or sometimes in XVIII) ; intestine begins in XIX, typhlosole commencing 

 four or Jive segments further back, a very prominent fold, terminating some segments before 

 the end of the body. Seven much thickened septa ; round the middle of the gizzard is 

 inserted a very delicate septum, (V/VI) ; in front of this are two recognizable septa, the 

 anterior of the two corresponding to the first septum of A. huttoni, but they do not 

 approximate in position to the boundary-line between segments HI/IF and IV/V. In 

 posterior segments of the body the nephridia are particularly well developed and open into 

 tubular diverticula of the gut. The dorsal vessel is double, commencing to be so in 

 segment VI, and there are four pairs of dilated hearts in X-XIII. The testes are attached 

 to hinder walls of their respective segments. The oraries also are attached to the posterior 

 wall of segment XIII, close to, and in contact with, the funnels of the oviduct. The 

 spermalhecae (in VIII, IX), with diverticula, imbedded in the body-wall, exist. Penial 

 setae present, though small. Hob. Neighbourhood, of Dunedin and of Ashburton, New 

 Zealand. 



There are a number of sensory papillae on the anterior segments, a description of 

 which is not included in the above, as they vary somewhat in number and arrangement. 

 In one specimen there were seven pairs in front of the male pores, intersegmentally 

 placed, commencing before viii/ix, and omitting xiii/xiv ; the first pair were the 

 smallest; there was another pair between xx/xxi ; the three last pairs of the anterior 

 series were fused to form single papillae. In another there was the same number 

 of pairs, but the two last were distinctly paired ; the two papillae of the very last 



