42 E. NOMURA : 



5). Rhizodrilus aucklandicus Benham. 



" Length, 29 mm. by 0.5 mm., with 80 segments, which are 

 triannulatecl — anteriorly, at least." " Chaetae. — Two bundles of 

 forked sigmoids on each side of each segment ; the two prongs are 

 of equal length and of comparatively large size. Dorsals, 3 or 4, 

 in the anterior part of the body ; 1 or 2 posteriorly. Ventrals, 

 anteriorly 3 or 4, occasionally 5 ; but posteriorly 2, or rarely 1. 

 The chaetae are absent in 11 and 12." " The nephridia are small, 

 and recall those of Enchytrarids in structure. . . . The first pair 

 lies in segment 7, the next in 9, the third in 13, and then they 

 occur in each of the following segments." " Genital pores. — The 

 male pores are paired on 11, . . . at the position of the absent 

 ventral cluetse. Spermathecal pores also paired at 9/10, in line 

 with ventral chsetse. Oviducal pores at 11/12, in the same line." 

 " Large wide funnels lie on the hinder septum ; each leads into a 

 short straight sperm- duct, which passes directly backwards along 

 the ventral body- wall, below the ovary, to enter the apex of a 

 penial apparatus. The wall of the duct is covered with groups of 

 gland-cells, as described and figured by Goodeich for F. jùlosus, 

 and such as are familiar in prostates. This covering commences 

 immediately behind the septum 10/11, and ceases as the duct 

 curves upwards at the hinder end of the segment to enter the 

 penial sac. The thin muscular wall of this sac is attached to the 

 dorsal body-wall of segment 12 by a group of retractor muscles 

 arising from its apex, which pushes the posterior septum of segment 

 13 backwards, the cavity of the sac, close to its proximal extremity, 

 is traversed by a few bundles of fibres of, apparently, connective 

 tissue. The sperm-duct passes through the sac, and is divisible 

 into two regions which differ structurally from each other : first it 

 dilates into an ovoid glandular bulb ; then the wall becomes thin 

 and folded to form the penis, which opens into a small penial 



