THE UIJGOCH.ETA OF NATAl. AND /UJ-ULAND. 4o3 



into two ringlets, vvliicli are equal to one another'in the fourth 

 to the seventh segments, but the front ringlet is larger than 

 the hinder in the eighth segment and even more so in the 

 ninth. Segment 10 and the following are simple or indis- 

 tinctly biannulated. 



Set« are absent from the first seven or eight segments. 

 They are very small and simple, being 0'25 mm. long and 26^ 

 thick, quite straight, and have no nodules or ornamentation, 

 strictly paired, and all ventral in position. The two pairs of 

 a side approach one another; generally (hi = nhout '4 n and 

 aa = 2h he. There is no distinct converging of the lines of 

 setfein the region of the copulatory wall as is seen in f . ty picus. 

 In the specimens of var. howickianns the ventral-median 

 distances of seta? remain undiminished in the seventeenth and 

 the twenty-third segments, and there are no sette on the 

 eighteenth to the twenty-second segments. 



The inconspicuous nephridial pores were not detected in 

 this form. 



The clitellum is saddle-shaped, sharply interrupted l)etween 

 the lines of the ventral pairs of seta?. It extends over 

 segments 13-22 (= 10). 



Copulatory Organs. — There are two broad, pear-shaped 

 copulatory walls extending over three segments, 19-21, and 

 stretching as far as the borders of the clitellum and the 

 lines of seta^ a. They are separated from each other by a very 

 small median longitudinal furrow. In front and behind the 

 walls there is a transverse cushion of glandular tissue which 

 differs a little from the glandular copulatory walls. These 

 two cushions occupy the whole length of the eighteenth and 

 twenty-second segments and reach laterally as far as the 

 borders of the clitellum. Towards the copulatory walls the 

 cushions cling closely to the obtuse angles formed by the 

 fore- and hind-margins of the walls. In the first specimen 

 examined the middle portions of the copulatory walls are 

 constricted and somewhat irregularly wrinkled, and the 

 cushions of the eighteenth and twenty-second segments are flat. 

 In the other specimen the copulatory walls, together with the 



