234 



t: 



lining) taking its course between the outer circular (C) and the 



inner longitadinal muscular layer (L). 



!i E. the epidernial layer. 



I Fig. 4. Portion of a ventro-dorsal nephridial duet yet more widely disten- 



ï ded. Lettering as in fig. 3. 



» 5 — 7. One of the short nephridial ducts in three sections belonging to 

 the same series. Fig. 5 just behind the nephridiopore , fig. 7 tho- 

 wing the junction between the nephridial duet Nd. and the reser- 

 j! voir R. — L , C & E as in preceding figures. 



Coe. Coelom. 



1 the cushions of longitudinal muscles situated between the l^t and 

 2nd seta. 



ms , ms' special muscles for these setae. 



nn' in fig. 6 , doii?ally and ventrally directed nervestems springing 

 from a common stem that has penetrated through the longitudinal 

 layer. The nerve n accompanies the ventro-dorsal nephridial duet , 

 if present. 



