420 WILHEL]\l MICHAELSEN. 



In the original description of this species I stated that the 

 clitellum was saddle-shaped, being interrupted ventrally 

 betAveen the lines of setas a. This statement is not quite 

 correct, or at least it is not in accord with the condition seen 

 in all the specimens of this species. In the Natal specimens 

 the clitellum is ring-shaped; but ventrally, and especially 

 between the lines of set^e a, it is less strongly developed. 

 Even in the type-specimens from the Transvaal there are no 

 distinct ventral borders to the clitellum, and it is not easy to 

 be sure that the glandular structure is entirely lacking medio - 

 ventrally. It is obvious, therefore, that such a slight 

 difference in structure does not justify a separation of the 

 Natal specimens from those of the Transvaal, 



Ocnerodrilus (Ilyogenia) africanus [Bedd.). 



Ilyogenia africana Beddard, " On some New Species of Earthworms 

 from various pai-ts of the World,'" Proc. Zool. Soc. Loncl., p. 703. 

 1892. 



Ocnerodrilus africanus (Bedd.); Michaelsen, "Die Re«'enwiirmer 

 Deutsch-Ost-Afrikas," Deutsch-Ost-Afrika, iv, p. 43. 1896. 



Ocnerodrilus (Enicmodrilus) africana (Bedd.); Eisen, "Re- 

 searches in American Oligochaeta, with especial reference to those 

 of the Pacific Coast and adjacent Islands," Proc. Cal. Ac. (3), ii. p. 

 112. 1900. 



Ocnerodrilus (Ilyogenia) africanus {Bedd.); Michaelsen, '" Oligo- 

 cha!ta," Tierreich, x, p. 380. 1900. 



Hab. — Chapel Street, Pietermaritzburg, Natal ; H. C 

 Burnup, December, 1911. 



Durban, Natal (teste Beddard). 



Five rather poorly preserved specimens, two of which are 

 mature, enable me to make some additional statements about 

 this incompletely known species. 



External Characters. — Dimensions of the two mature 

 specimens : length 25 mm. and 35 mm., maximum diameters 

 rO mm. and 1'3 nun., number of segments 78 and 82. 



Colour greyish without special pigmentation. 



