742 J. H. ASHWORTH. 



the tail whicli were stretched at the inoment of death. The 

 space between two of the larger aniiuli is sn])diviiled at the 

 anterior end of the tail into two or three rings, but further 

 back into from four to ten. These smaller annuli also bear 

 epidermal papillas, but in the anterior tail region the}' are 

 distinctly smaller than the papillae found on the larger annuli. 

 Proceeding backwards along the tail, the difference in the 

 size of the annuli and of the papilla? they bear may be 

 clearly recognised until the middle of the tail has been passed; 

 then the papillae become almost equal in size, and near the 

 anus it is impossible to distinguish any difference between 

 those of the various annuli. There are about twenty-eight 

 segments in the tail of each of the complete specimens. 



SetfB. — The capillary sette (Hgs. 1, 1a) of the notopodium 

 are very similar to those of A. marina. The}^ attain a 

 length of 4'3 mm., and on their distal fourth bear small 

 pointed processes, which, as Ehlers (1897, p. 101) remarked, 

 are not so well developed as those of A. marina. The 

 processes are usually present on both sides of the seta; they 

 are moderately obvious on one side, but on the other they are 

 very minute, and are borne on the edge of a thin border or 

 lamina. This lamina, which seldom exceeds G ^t in width, 

 extends along the seta for a distance of about one third its 

 length. In some of the seta? the lamina is not denticulate at 

 its mai-gin, and in others is only very faintly so ; but it is 

 crossed by fine oblique lines, the intervals between which 

 correspond roughly to the size of the teeth on thedentigerous 

 laminee. From an examination of the setae of A. as si mil is 

 and A. marinn, it seems ])robable that the lamina at first 

 possesses an entire margin, but later this tends to break up 

 from the edge inwards, thus giving rise to the minute teeth 

 which are usually seen on full-grown seta3. This exjilanalion 

 would account for the fact that in some seta; the mai-gin of 

 the lamina is entire, while in others it bears cither exceed- 

 ingly minute denticulations or the more obvious tooth shown 

 in fig. 1 A. These three conditions are occasionally seen at 

 diftorent points along the border of a single seta. 



