552 OLIGOCHAETA 



pair were further apart than those in front. Since my original description of this 

 species (8), I worked out in greater detail its anatomical characters, and studied the 

 embryology^- In one out of a number of young worms ready for hatching but still 

 within the cocoon, I found the prostomium to be complete and the dorsal vessel to 

 be single. In other respects this specimen agreed entirely with the present species. 



(a) Octoehaetus thomasi, Beddaed. 

 O. Thomasi, Beddabd, P. Z. S., 1892, p. 671. 



Definition. Length, 144 mm.; diameter, 5 mm.; number of segments, 230^. Clitellum, 

 XIII-XIX. Dorsal pores not seen. Gizzard occupies segments V and VI ; calciferous 

 glands in XVII ; intestine commences in XIX. First septum separates segments IV/V ; 

 septa VI/VII to XII/XIII thickened. Dorsal vessel becomes double in segment VII ; 

 four pairs of hearts in X-XIII. Gonads attached to posterior walls of segments. 

 Spermathecae with numerous minute diverticula crowded round duct at pore. Hab. — 

 New Zealand. 



(3) Octoehaetus huttoni, Beddaed. 

 O. Huttoni, Beddaed, loc. cit., p. 674. 



Definition. Length, 130 mm.; breadth (at clitellum), 7 mm.; number of segments, 233. 

 Colour during life, pink ; clitellum white. Clitellum, XIII-XIX {XX). Setae in couples 

 not closely approximated. Dorsal pores commence XI/XII. Gizzard in V. In segments 

 XV, XVI, calciferous glands; intestine begins in XVIII, but typhlosole {which is very 

 prominent) does not begin before XX, ending at about sixty segments before the end of 

 the body. First septum is in front of proventriculus ; it separates III/IV. After gizzard 

 are sine stout septa, and following these are two which are rather more developed than the 

 rest, but not so strong as those which precede them. Dorsal vessel double. Three 

 pairs of dilated hearts in X, XI, XII. All the gonads are attached to the front walls 

 of their respective segments. Spermathecae {in VIII, IX) with a minute clump of 

 diverticula presenting the appearance of a solid white body of about the size of a pin's 

 head. Hab. — New Zealand. 



This species is clearly nearly allied to A. multiporus. 



' See Beddakd, No. 51. 



'^ None of the specimens examined were quite intact ; the above measurements are probably nearly right. 



