THE o[jgochj:ta of natal and zululand. 431 



extends further towards the distal tip, where it is also more 

 sharply defined. 



Setal glands : each pair of sexual seta3 is provided with 

 two great glands lying medially, one in front and one behind 

 the seta^. These glands differ in shape considerably from 

 those of typicus; they have the shape of a sausage, and are 

 about three times as long as thick and project freely into the 

 body-cavity. 



Remarks. — Var. ca3menterii differs from the typical 

 form of Microcha^tus papillatus in the extent of the 

 clitellum, in the possession of distinct copulatory cushions, in 

 the position of the copulatory papillae and the sperniiithecal 

 pores, and in the shape of the sexual sette and of the setal 

 glands ; perhaps also in the number of segments, which is 

 larger even in the smallest mature specimen of the variety 

 than in the largest mature specimen of typicus. 



Microcha^tus sulcatus (Kinh.) f. typicus. 



Tritogeuia sulcata Kinberg, " Amiiilata nova [Continuatio],"' Ofv. 



Ak. Forh., 1866, nr. 4, p. 98. 1867. 

 Tritogeuia sulcata Kinh.; Michaelsen. "Revision der Kinbero-'- 



schen Oligocliaiten," Ofv. Ak. Forh.. 1899, nr. .5, p. 415. 

 Tritogenia sulcata Kinh.; Michaelsen, " Oligochseta." Tierreicli. x, 



p. 453. 1900. 

 Tritogenia morosa Cognetti, " Nuove specie dei Generi. " Phere- 



tima" e •'Tritogenia."" Atti. Ace. Torino, xli, p. 13, t.f. 14-17. 



1906. 

 Tritogenia sulcata iTmfo. = T. morosa Cogn.; Michaelsen, " Oligo- 



chseten aus deni Westlichen Kapland," Denksch. nied.-nat. Ges., 



Jena, xiii. p. 32. 1908. 



Hab. — Natal ; Port Natal (teste Kinberg) ; Durban (teste 

 Cognetti) . 



Through the kindness of Prof. Theel I have been enabled 

 to re-examine the type and confirm most of my former state- 

 ments, but the following corrections are to be made. 



The median ventral distance of the setas obviously diminishes 

 towards the segments which bear the copulatory walls, as I 

 stated; but it does not diminish so far as to vanish, as I 



