6 



ARKIV FOR ZOOLOGI. BAND 7. NIO O. 



between the second and first there are two, and in front of the 

 first chaetigerous annulus there are three rings, as stated in Kin- 

 bérg's diagnosis (»segmentum buccale triannulum»), and the 

 prostomium. The ainnulation of the anterior end is as repre- 

 sented in Kinberg's figure and in the accompanying diagram. 



The difference in the sculpturing 

 of the skin of the prebranchial and 

 branchial regions is not so marked 

 and abrupt as it is shovvn in Kin- 

 berg's figure. 



The tail is strong and muscular, 

 its numerous segments (usually about 

 100 to 150) 1 are very narrow from 

 before backwards, especiahy in the 

 anterior half of the tail. The epi- 

 dermis is raised into small rounded 

 papillae; there are no elongate papil- 

 lae or other outgrowths of the body 

 wall in this region. 



The notopodia have the usual 

 bluntly conical form; a tuft of capil- 

 lary setae projects from the oval 

 aperture of the setal sac, which is 

 situated on or near the rounded 

 apex of the notopodium. 



The type specimen possesses a 

 twentieth segment bearing notopodial 

 setae (Fig. 2). Following the nine- 

 teenth chaetigerous annulus are four 

 rings and then a larger one. On 

 the right dorso-lateral region of this 

 larger annulus there is a slight elevation, from an aperture 

 in which a tuft of twelve to fifteen capillary setae projects; 

 on the left side there is a ccrresponding setal sac but setae 

 are no longer present in it. The setae remaining in this spe- 

 cimen are now very loosely held in position, several bundles 

 of notopodial setae are seen to be on the point of falling out of 

 their setal sacs and others have already done so, among the latter 

 the small tuft which was in the twentieth left notopodium. 



Arenicola loveni 



Dorsal aspect. X 1.7. 



MO. Mouth, N^ First iiotopodium, 



N. GR.Nuchal groove, Pr. Prostomium 



There are 175 septa in the tail of one of the Saldanha specimens. 



