THE OLIGOCH^TA OF NATAL AND ZULULAND. 427 



Hab.— Durban, Natal; T. H. Bowker, 1898, Dr. Purcell, 

 1907, E. C. Chubb, 1911. 



Pietermaritzburg ; W. G. Rump, December, 1911. 



Also, Durban (teste Benham) and Stamford Hill, near 

 Durban (teste Micliaelsen). 



Ten specimens in all were examined, and these I call 

 Microchtetus papillatus -Ben/j. f . typicus. 



External Characters. — The dimensions of the mature 

 specimens vary considerably ; length 220-350 mm., diameter 

 10-16 mm., number of segments 324-490. 



Colour yellowish-grey with sometimes a slight violet-grey 

 tint on the upper anterior surface. 



Head prolobous. Segments 1-3 simple, fourth to the ninth 

 all divided by a furrow into two ringlets of about equal size, 

 but the hinder ringlet, especially of the ninth segment, is 

 often somewhat shorter than the front one. The tenth and 

 following segments are simple or slightly biannulated. 



Setae are rather tender ; they begin on the third segment 

 and are strictly paired. The median ventral distance is equal 

 to the middle lateral {aa = he). The median dorsal distance 

 equals about one-half of the circumference of the body 

 (^dd = circa iw). 



The nephridial pores are in the lines of sette cd. 



Clitellum is saddle-shaped and extends over the segments 

 10-29 or 30 = 20 or 21 ; but it is not always sharply bordered 

 in front and behind. 



Copulate ry Organs. — A pair of copulatory walls extend 

 laterally over the five segments 16-20, being very prominent 

 in the middle segments 17-19. These walls broaden the 

 body at this region, especially in the nineteenth segment, and 

 here ventrally the body is flattened. There are no copulatory 

 cushions, or at least no distinct ones. There are generally 

 two pairs of large copulatory papillae with sexual seta3 which 

 are always in the lines of the ventral pairs of seta3. The 

 position of these papillee is rather constant. There is always 

 a pair on the tenth segment, and a second pair either on the 

 twenty-third segment (in seven specimens) or on the twenty- 



