DESCRIPTIONS OF GENERA AND SPECIES 551 



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

 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, Beddaed. 



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

 O. multiporus, Beddaed, P. Z. S., 1893, p. 674. 



Definition. Length, up to 14 1 inches; IreaAth {at clitellwni), 13 mm.; number of 



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



Dorsal pores present. Gizzard in Y and VI or FI alone. Calciferous glands [one 



pair) in XFII {or sometimes in XVIII) ; intestine begins in XIX, typhlosole commencing 



four or five segmetits 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 {VjVI) ; 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 III/IV 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 ovaries also are attached to the posterior 



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



spermathecae {in VIII, IX), with diverticula imbedded in the body-wall, exist. Penial 



setae present, though small. Hab. — Neighbourhood of Bunedin 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 



