436 WfLHELM MICHAKLSP]N. 



sette, for these pairs, like the setaj of the twelfth segment, are 

 provided with setal glands. 



Setal gland s. — The sexual setae of the twelfth segment are 

 closely accompanied by a number of rather large pear-shaped 

 setal glands, seven at each side, forming with the two sexual 

 seta3 a closely crowded group on each side. The pairs of 

 ventral setge of the twenty-third segment, which have not been 

 replaced by a single seta, are provided with a group of four 

 pear-shaped setal glands which are distinctly smaller than 

 the setal glands of the twelfth segment. In the fifteenth to 

 the seventeenth segments there were no setal glands in the 

 specimen which was examined. 



Remarks. — The var. howickianus may be distinguished 

 from f.typicusofMicrochfetussulcatusby some external 

 and internal features. In var. howickianus the lines of 

 seta3 are not converging towards thei'egions of the copulatory 

 walls as in f . typicus. Other differences are to be seen in 

 the position of the female pores, in the thickness of certain 

 septa, and in the number of the setal glands ; in typicus there 

 are only four on each side of the twelfth segment, and in 

 var. howickianus there are seven. 



Our knowledge of the f. typicus of this species, based 

 upon the study of badly preserved or immature specimens, is 

 far from being complete. For this reason in the foregoing I 

 have given as complete a description as possible of the var. 

 howickianus. The main points in the external and internal 

 anatomy of the variety will presumably agree with those of 

 the typical form, and may be regarded as completing our 

 knowledge of the latter. 



Microcha^tus zuluensis I'edd. 



Micvoclia*tus zuluensis Bedd., "On two new sj)ecies of Micro. 



chsetus," Proe. Zool. Soc. Lend., 1907, i, p. 279, with figures. 

 Microchsetus znlu Michaelsen, '• Olig. v. Natal u. d. Znluland," 



Arkiv. Zool. iv, p. 6, fig. 3. 1907. 



Hab. — Eastern Zululand; E.Warren, June, 1903 (immature 



