1914.] J.Stephenson: Oligochaeta. ^ 371 



were small, sausage-shaped, curved outwards at their hinder ends, 

 and contained altogether in segment xii. 



The spermathecal ampulla is attached to the posterior face 

 of septum ^, in the arch of the nephridium ; it is egg-shaped, and 

 almost meets its fellow, to which it is attached by a peritoneal 

 band, in the middle line above the oesophagus. The duct is thin 

 and much coiled, on the posterior face of the septum ; it makes 

 no appearance in segment vii, and on reaching the body-wall it 

 bends outwards to end in a lateral position, without any atrial 

 dilatation. 



Of the specimens from Rotung, the longest was 2^ inches, 

 but specimens i|- inches long showed the male papillae distinctly ; 

 diameter 4 mm.; segments of one of the specimens about 165, 

 very closely crowded together except the first few. The colour 

 varies considerably ; the specimen taken for dissection was pale, 

 with an olive-green tinge in its anterior half ; but in some of the 

 smaller, immature specimens the olive colour was more pronounc- 

 ed and not limited to the anterior part. The prostomium was 

 apparently zygolobous. No clitellum could be distinguished in 

 any of the specimens. 



The setae are strictly paired ; ah^='^—io aa=cd ; he is slightly 

 greater than «a ; dd=f of the circumference. Setae a and b are 

 absent on segment xi, present on ix and x. 



The male and spermathecal apertures are as in the previous 

 specimen ; the female apertures were not distinguishable. None 

 of the specim.ens showed the genital markings described in the 

 previous specimen. 



Four well-developed gizzards are present, in segments xv — 

 xviii^ that in xv being smaller than the rest ; the portion of the 

 oesophagus in xiv may be described as a rudimentary gizzard. 



In shape and position the sperm-sac shows an exact corres- 

 pondence with that of the specimen first described ; the duct 

 is also exactly comparable in its course and ending. The prostate 

 in the present example was slightly oval with its long axis 

 transverse, cushion-like, and not much elevated. 



The female organs also agree; and so too the spermathecal 

 apparatus, except that the ampulla in the present example was 

 very small, probably undeveloped. 



The feature of the Rotung specimens which leads me to 

 identify them with the Renging worm, is the characteristic shape 

 of the testicular sac ; and, in general, the close correspondence in 

 the anatomy of the genital organs. It is quite possible that some 

 of the differences are due to the Renging specimen being more 

 fully developed ; thus we may perhaps account for the absence of 

 genital marks and of all trace of a clitellum in the examples from. 

 Rotung, as well as for the small size of the spermathecal ampulla. 

 A difference of a segment in the position of the gizzards need cause 

 no hesitation. There thus remains a slight difference in the ratio 



