432 WILHELM MICHAEF-SEX. 



erroneously supposed.^ In the segments Avitli the copulatory 

 walls the setas are oblitei-ated, and in tlie neig'hbouring- 

 segments, seventeenth and twenty-second, the median ventral 

 distance has diminished so as to equal the middle lateral 

 distance, aa = he, and only the converging lines of seta?, if 

 continued over the segments 18-21, would meet each other in 

 the middle line as stated correctly in my earlier description.- 



The so-called median-ventral "papilla?" at the hinder part 

 of segments 17 and 21 are not really papilla?, but only flat glan- 

 dular patches; they are identical with the copulatory cushions 

 at the eighteenth and twenty-second segments of var. 

 howickianus {)i. var.). 



A comparison of the type of f . typicus with specimens of 

 var. howickianus makes it probable that the number of 

 segments of the type should be increased by one. From this 

 there would result a greater conformity of the two forms, and 

 since the type-specimen had been cut into pieces it is quite 

 likely that a segment had been lost. 



Var. howickianus n. var. PI. XXXII, figs. 13-15. 



Hab. — Howick, Natal ; found under large stones in the 

 rather dry clayey soil of a meadow, W. Michaelsen, August 

 30th, 1911 (two specimens). 



External Characters. — Dimensions : length 80, 85 mm., 

 diameter 6, 6*5 mm., number of segments 90, 91. 



Colour of middle paints of body light greyish with a bluish 

 tint, ends of body yellowish. Clitellum white. 



At first sight it appears unintelligible hoAv such a clumsy, 

 soft worm could burrow into the rather hard soil in which it 

 was found. But an examination of the internal anatomy 

 showed that the head-portion is provided with a strong bur- 

 rowing apparatus in the form of a muscular body-wall, 

 thickened septa and strong gizzard. 



Head prolobous. 



Segments 1-3 simple ; the fourth to the ninth are divided 



> Michaelseu, W.. " Oligochajta," ' Tierreich,' x, p. 453. 1900. 

 2 Michaelsen. W.. ' Ofv. Ak. Farh.." 189H. nr. 5. p. 417. 



