168 MR. F. E. BEDDARD ON WORMS [Feb. 16, 



should conclude that this species is one whose characters are not 

 yet definitely fixed ; it is evidently on the way to entirely losing the 

 setse upon the clitelluui. 



The genital papillce, as has been already remarked, differ in the 

 three individuals. 



In a there is, in the first place, a median sucker-Uke papilla upon 

 segment vii., just in front of the circle of setse ; and in the second 

 place, a single median papilla occupying an exactly corresponding 

 position upon segment xviii. 



In b there is no anterior papilla or papillae ; on segment xviii". are 

 two papilla? placed on the inner side of each atrial pore and lying 

 below the circle of setse ; the innermost papilla on each side is below 

 as well as to the inside of the outermost, which occupies a corre- 

 sponding position with regard to the male pore. 



In c the arrangement is by far the most compUcated, and yet 

 this individual is the one whicii has the most setae upon the clitellum. 

 There are no anterior papillae; on the eighteenth segment a small 

 circular papilla lies above each atrial pore and another lies exactly 

 below it, on the boundary-line between segments xviii./xix. In the 

 middle of segment xviii. are two papillae lying side by side and above 

 the setae of that segment. On the right-hand side of the body is 

 another papilla, which lies just above one of these two. There are 

 thus seven papillae in all. 



In all three individuals the atrial pores are lateral in position, 

 being separated by the entire diameter of the body, which is here a 

 trifle wider than either anteriorly or posteriorly. 



With regard to the internal anatomy, all three specimens showed 

 the foiiowuig characters in common : — 



The gizzard occu])ies the usual position, and there are a pair of 

 intestinal cceca. 



The intestine has a small typhlosole. 



The atria have an extensively developed glandular portion, which 

 extends from segments xvii.-xxi. in b and from xviii.-xxii. in a ; it is 

 rather smaller in c, but then the worm itself is smaller ^. 



1 found two pairs of egg-sacs attached to the posterior face of the 

 septa dividing segments xii./xiii. and xiii./xiv. ; they are pear-shaped 

 with a long stalk, and not very wide at the widest end. 



The position and number of the spermatheccB differ in the three 

 individuals : in a there were two pairs somewhat unsymmetrically 

 disposed ; they open, however, in the intersegmental grooves v./vi. 

 and vi./vii. In segment vi. lie a pair, of which one was very small 

 and immature; the fully developed spermatheca consists of an oval 

 pouch terminating iu a narrow duct, from which arises a long 

 cylindrical appendix. In segment vii. the spermatheca of the right 

 side of the body had the same characters ; on the left side the duct 

 of the spermatheca, although opening in the normal position, is 

 greatly elongated, traversing septum vii./viii. and expanding in the 

 viiith segment into the large oval pouch. The diverticulum of this 

 spermatheca lies in segment vi. 



^ It raeasui-es 84 ram. ancl consists of 64 segineuts. 



