I9I4-] J.Stephenson. Oligochaeta. 407 



The male apertures are a pair of deep pits, oval in superficial 

 outline, with one or two curved genital setae projecting from them. 

 The centre of each pit is in the line of setae 6; from this the pit 

 extends inwards as far as the line a, and outwards for an equal 

 extent. 



The female aperture (?) of the right side was possibly re- 

 presented by a shallow perfectly circular depression with a 

 clearly cut margin, in the situation of groove tt on the anterior 

 part of the clitellum. The size of the depression, which was 

 present on the right side only, was such that while its centre 

 corresponded to the middle of the mterval ah, it overlapped the 

 lines a and h by its inner and outer margins respectively. 



The spermathecal apertures are a single pair, small, in furrow 

 I, the centre of each midway between the lines h and c. 



Under the head of genital marks may be mentioned a pair of 

 small oval depressions, their long axis transverse, which occur 

 in the course of groove ttt. On the left side the depression extends 

 accurately between the lines a and h\ on the right it reaches a 

 little further outwards, passing the line h. 



Septum t is stout, ;} very stout and conical, with apex poste- 

 rior; the next septum is t, and this, rH, and f? are all stout, and 

 situated close together ; H is apparently absent, the condition 

 being the same as in E. koboensis; the rest of the septa are thin, 

 ft being especially delicate and fenestrated. The three thick septa 

 behind the gizzard (Ij-tt) are closely connected together; they 

 have their separate insertions in£o the body- wall, but are united 

 to each other by a thick muscular sheet placed longitudinally. 



Behind the buccal cavity is a slight constriction of the ali- 

 mentary canal at the insertion of septum -, ; then succeeds a dila- 

 tation (pharynx), which with a narrower but still firm and muscular 

 portion of the tube is contained within the cone of septum 5. The 

 gizzard is ovoid, in the interval between il and tt; the oesophagus 

 enters it on its upper surface; i.e. the gizzard projects forwards 

 underneath the oesophagus. The tube is narrow in segments ix, 

 X and xi ; in xii it presents a pair of lateral swellings which have a 

 lamellar structure internally. The intestine begins in xv; the 

 canal is however again narrowed between the prostates, finally 

 swelling out in segment xxi. 



The last heart is in segment xiii ; that in xi is small, and the 

 corresponding septum is represented only by a sheet of connective 

 tissue between testis sac and vesicula seminalis. 



The excretory system is micronephridial ; there is a row of 

 numerous micronephridia along the body -wall in each segment, 

 and a large tuft anteriorly on each side, by the side of the buccal 

 cavity in segment iii. 



The testis sac of each side, in segment xi, is large, and un- 

 connected with its fellow ; it bulges forwards the septum in front 

 of it (tt), which is rather thinner over the anterior end of the sac; 

 this anterior end can thus be shelled out of a recess in the sub- 

 stance of the septum. 



