THE OLIGOCH.F.TA OF NATAL AND ZULnLAND. 429 



Setal glands : the pairs of sexual setie are provided with 

 two or four setal glands. These are sac-like and compressed 

 on the longitudinal axis so as to be much broader than long. 

 Benhara describes two glands, one in front and one behind 

 the setfe. I generally found four of these glands forming a 

 squai*e, the centre of which was occupied by the pair of 

 sexual seta?. In one specimen there was a transitional 

 arrangement ; here only two glands were obvious, and they 

 were placed laterally ; but in front and behind in the middle 

 line the body-wall was distinctly elevated on the inner 

 surface. Doubtless these elevations were due to the formation 

 of two setal g-lands which did not break through the muscular 

 layer of the body-wall. These specimens with only two setal 

 glands in connection with each pair of sexual setas come 

 nearer to the variety c^menterii described below. The 

 difference between Benham's type and the specimens that I 

 have examined must be regarded as being due to a casual 

 variation . 



Microcha3tus papillatus Bniih. comes nearest to M. 

 pentheri Rosa from the Cape Province; the principal 

 difference is that in M. pentheri there are two strongly 

 thickened septa in front of the gizzard, whilst in M. papil- 

 latus the septa in front of the gizzard are very tender. 



Microcha3tus papillatus Benham. var. ca?menterii 

 n. var. PL XXXII, fig. 11. 



Hab. — Howick, Natal; in swampy meadows, W. Michaelsen, 

 August 30th, 1911. 



St. Peter's Churchyard, Pietermaritzburg, February, 1905. 



Pietermaritzburg ; E. Warren, May, 1912. 



There were three mature specimens with several half- 

 mature ones. 



External Charactees. — Dimension of the largest : length 

 540 mm., diameter 9-11 mm., body bi'oadened in the region 

 of the copulatory walls into a breadth of 22 mm. ; number of 

 segments about 600. Dimension of the smallest mature 

 specimen: length 330 mm., diameter 7-10 mm., body 



VOL. 2, PART 4. 29 



