2 ARKIV FÖR ZOOLOGI. BAND 5. N:0 10. 



»The Red. Duiker» (Cephalophus natalensis A. Smith) 

 is represented by four specimens which all are alike in shape, 

 but one is ricbly black-pigmented, the others not. As could 

 be expected these specimens agree with the descriptions of 

 the same organ of other species of the same genus viz. 

 G. maxwelli described by Garrod (1) and C. ^nelanorheus 

 described by the present writer (6). As the Red Duiker be- 

 longs to another group of species within the genus than 

 those described previously it was of value to state this. The 

 end of the penis is as may be seen on fig. 1 thickened and swol- 

 len so as to form a kind of cushion situated dorsally and on 

 the right side which bends down and curves somewhat to 

 the left. By this arrangement the urethra wich runs along 

 the lower side of the organ is forced downwards and some- 

 what backwards^ but then upvards again on the left side be- 

 fore it detaches itself and is produced into a long and filiform 



processus urethralis. The com- 

 plete sof tness of this process per- 

 mits it to occupy any position 

 whatever, as is proved by its 

 Fig. 1. End of penis of Cephalophus clifferent situation in^ the three 

 natalensis. specimens which all w^ere pre- 



served (in formalin) in situ 

 within the prepuce. In the specimen figured it was directed 

 straight backwards as represented in the figure. In another 

 it was directed backwards with its proximal half but then 

 doubled back on itself again with its distal half. In the 

 third specimen is was directed forward reaching beyond the 

 cushion. In the fourth it was irregulary curled up at the 

 front end of the penis. The length of this filiform processus 

 urethralis is from 28 to 31 mm. 



»The Common Duiker» (Sylvicapra grimmia (Lin.)) 

 is represented by one specimen which in a considerable degree 

 differs from the type exhibited by the true members of 

 the genus Cephalophus. The end of the organ is not so much 

 thickened and the terminal cushion does not increase the 

 diameter of the organ as may be seen on fig. 2. It occupies 

 chiefly the upper and right side of the penis-end forming on 



^ In the state of erection the condition is probably different. 



