iQoS.] J. Stephenson : The Anatomy of some Aquatic Oligochœta. 281 



septal gland; d.b.v., dorsal blood-vessel; d.s., dorsal setse: ; d.s^., j&rst dorsal setal 

 biindle ; d.s'^\, d.s^., etc., the dorsal setse of the second, the sixth segment, etc.; e., 

 eye; f.b., foreign bodies; gg., the ganglia of the ventral chain; int., intestine; int. 

 cil., ciliated wall of intestine; m., mouth; mor., sperm-mornlse ; m.s., muscle of 

 the setal sac; muc., mucoid coating; n^. — n\, the four pairs of nephridia; nau., 

 " Nebenaugen" ; W.C., nerve-commissure; 0., oil-drops; a.b., ''opaque body " ; oes., 

 oesophagus; ov., ova; par., parasite; pg., pigment-bodies; ph., pharynx; ph.cil., 

 the specially ciliated region of the pharynx; pr., prostomium; pr'\, prostomium of 

 second animal; r., rim of buccal funnel; r. sem., receptaculum seminis; s., spaces of 

 peri-intestinal sinuses; s.gl., septal glands; s.h., sensory hairs; sp., septum; sp.g., 

 subpharyngeal ganglion ; s.S., setal sac; s^., stomach; sz., spermatozoa; ^ßs., testis; 

 v.n.c, ventral nerve cord; v.s., ventral setae; v.s^., first ventral setal bundle; v.s^., 

 v.s^., etc., the ventral setae of the second, third segments, etc.; v. sem., vesicula 

 seminalis ; v. v., ventral blood-vessel. 



