430 WILHELM MICHAELSEN. 



broadened in the region of the copulatory walls to a breadth 

 of 22 mm. Number of segments about 530. 



Clitellum distinctly bordered in front aud behind, extends 

 over the segments 12-24 ( = 13). Copulatory walls form 

 sharp ridges in the lateral lines, extending over segments 

 16-20, highest at the eighteenth segment. A pair of flat but 

 very distinct copulatory cushions, surrounded by a wall-like 

 rim, extend medially from the ridges of the copulatory walls 

 from the fore-border of the seventeenth segment as far as 

 the hind-border of the twentieth segment. These cushions 

 are broadest at the seventeenth segment, there reaching from 

 the lines of seta3 d nearly as far as the lines of setas h, but 

 the latter are distinctly outside the cushions, being separated 

 from them by a distance ot about 1*5 mm. 



Copulatory papilla? are of very large size and bear the 

 sexual seta3 at the twelfth, fifteenth and nineteenth segments 

 (in two mature specimens), or at the tenth, eleventh, twelfth, 

 fifteenth and nineteenth segments (in one mature specimen), 

 or at the fifteenth, sixteenth and twenty-eighth segments (in 

 one half -mature specimen). Smaller papilla occur on all 

 other segments from the tenth to the twenty-eighth segment. 

 All the papillas, both large and small, occupy the lines of the 

 ventral pairs of setae, forming a pair of regular longitudinal 

 series. 



Spermathecal pores are in groups of 3-5 on each side on 

 the furrows between segments 11-12 and 12-13. 



Inteknal Anatomy. — The sexual setee seem to be larger in 

 this variety. The larger seta of a pair was 2*5 mm. in length, 

 and proximally about 90 ju in thickness ; the smaller seta was 

 1*8 mm. long and 80 /x wide. The sexual setfe are slightly 

 sigmoid in shape. Distally they diminish in thickness. The 

 tip is generally broadened in the plane of curvature, and ends 

 in two thick and short teeth which are joined by a web-like 

 membrane nearly as thick as the teeth. The tip is thus wedge- 

 shaped. Sometimes, apparently through wear, the typical 

 shape is not visible. The ornamentation of the distal end 

 resembles that seen in the sexual sette of typicus; but it 



