THE OLIGOCH.ETA OF NATAL AND ZULULAND. 419 



are provided with one simple diverticulum. In the specimen 

 from Natal, carefully examined by myself, each of the four 

 spermatheca? was provided with two divei'ticula, and one of 

 these in three of the four spermatheca? was even doubled. Each 

 diverticulum carried a completely separated globular seminal 

 chamber. The diverticula seem to be rather fragile and easily 

 torn off, and perhaps in Eisen's specimen one of the diverticula 

 had been overlooked through being broken away accidentally. 



Further, Eisen's statement with regard to the larger of the 

 two penial seise requires modification. Eisen^ describes it as 

 being "strongly wavy" in outline, "but with no other ornamen- 

 tation," and it may appear thus in a balsam preparation. 

 Mounted in spirit or in water the waviness is seen to depend 

 on the presence of a number of convex longitudinal ridges, 

 which are sharply truncated distally. The ridges on one side 

 correspond to grooves on the opposite side, and when the 

 seta is viewed in profile a wavy appearance is produced. 



In all other points the penial setas of the Natal specimen 

 agree with Eisen's description. 



Dimensions : large penial seta, length 0"6 mm., diameter at 

 proximal end 10//; smaller penial seta, length 0*4 mm., 

 diameter at proximal end 7//. 



Sub-fam. Ocnerodrilin.e. 



K e r r i a g u n n i n g i Mich. 



Kerria guuniugi MichaeJsen, " Oligocliateu vom tropisclien mid 

 siidlich-subtropischen Afrika, ii," Zoologica, Heft 68, p. 1. 1912. 



Hab. — Howick, Natal ; in detritus near the Umgeni Falls, 

 W. Michaelsen, August 30th, 1911. 



Umgeni near Durban, Natal ; in the mud on the marshy 

 banks of the Umgeni River, W. Michaelsen, November 7th, 

 1911. 



Pretoria, Transvaal (Michaelsen). 



' Loc. cit., p. 229, and pi. x, fig. 87. 



