TSE OLIGOCH^TA OF NATAL AND ZULULAND. 415 



Chilota trfigardhi Mich. var. major 7^. t-a?-. PI. XXXII, 



figs. 4, 5. 



Hab. — Hilton Road, eleven miles N.W. Pietermaritzburg 

 Natal; Dr. M. A—, July 28tli, 1905 (one nearly mature 

 specimen) . 



Natal; Miss Blackmore, 1905 (several immature specimens 

 with only two showing the first signs of sexual organs, one 

 nearly mature specimen). 



External Characters. — Largest specimen, length 130 mm., 

 diameter 3"5— 4 mm., number of segments 124. 



The colour and arrangement of seta3 are as in the typical 

 form. The lines of setae a and b converge very gradu- 

 ally towards the male pores, and the setfe are distinctly 

 enlarged at the hinder end as in the typical form. In the 

 original description of typicus I omitted to record these facts. 



Internal Anatomy. — As far as the sexual development and 

 the state of preservation permitted me to see, the general 

 anatomy resembles that of typicus with the exception of the 

 shape of the penial set«. In typicus each prostate is accom- 

 panied by two penial sette of distinctly diifei'ent shape, while 

 in major these seta3 closely resemble one another and differ 

 only slightly in size. The penial setas of major are very 

 slender, being 1-1"1 mm. long and 13 fx thick at the proximal 

 end ; the seta tapers very gradually towards the distal end, 

 where the thickness is about b /x. The setas are only slightly 

 bent, and they are quite smooth and transparent without any 

 ornamentation, while in typicus one kind of the penial setse 

 has an external ornamentation, which, however, is rather faint 

 and irregular, and perhaps has no great systematic value. 



In typicus the distal tip is simple and sharp-pointed; but in 

 major it has a very characteristic shape, and in both of the 

 penial setae the distal extremity ends in two minute claws, 

 which are connected together by a membrane like that of a 

 webbed foot. In the plane of the membrane the extremity 

 is slightly widened, but in profile there is no broadening. 



