452 



Mr. II. A. Bnvlis on a 



lcn"^th nn<l 0015 mm. in thickness. Tlic portion distal to 

 the noduhir lliickcMiinp; is much shorter than the |)roximal 

 ])ortion, and only a very short piece projects beyond the 

 l)ody-w.ill. 



The dorsal pores invariably begin at v./vi. The continuity 

 of the series is always broken by the absence of one or morc 

 of the pores in front of tlie clitclhim, as has been remarked 

 in the closely allied forms I), muorei und D. johnntoni ^. The 

 puic at xi./xii. seems to be invarial)ly absent, while of those 

 at x./xi. ainl at xii /xiii, one or both may also be missing. 



Fi- 1. 



I'ig. 2. 



Fijr. 1. — Divhxjasfer jacuhitri.r. Distal end of one of llie penial setiB. 

 Fi''. 2. — Ditto. Two ordiuarv cliata?. 



There is little doubt of the normal absence of these pores, as 

 the remainder are, in nearly all cases, well-expanded and 

 easily visible. The pore at xiii./xiv. is sometimes visible, but 

 the rest of the pores belonging to the segments of the 

 clitellura, if present, are greatly obscured, until near the 

 hinder end of the thickened epitlielium. From xxi./xxii. or 

 xxii./xxiii. onwards there is a continuous series of pores. 



The apertures of the two pairs of spermatheese occupy 

 their usual positions at vii./viii. and viii./ix.; near the mid- 

 ventral line. 



* Beddard, Proc. Zool. Soc. 1001, ii. pj). 192, 109. 



