VERMES 



ii 9 



Cat.ne 

 .ta,l vcs 



dorsves 



firob 



prob i— 



7eir.mue 



dorsves 



cert- 



Fig. 109. Young Tetrastemma obscu- 

 rum. ow.anus; ac st, accessory stylet ; 

 , r , brain; al.gr, ciliated groove; 

 dors.ves, dorsal vessel ; lat.ne, lateral 

 nerve; lat.ves, lateral vessel; >ieph, 

 nephridium ; op.neph, nephridial open- 

 ing; prob 1 , eversible part of proboscis; 

 prob' 1 , non-eversible part of proboscis ; 

 prob.ap, aperture for the protrusion of 

 the proboscis ; retr.mus, retractor muscle 

 of proboscis; st, stylet. (After M. 

 Schulze, from Parker and Haswell's 

 Manual.) 



Fig. no. Pilidium larva of one of the 

 Nemertini; lateral aspect, highly magni- 

 fied. (Drawn from life by the autho 



Fig. hi. Micrura verrilli, one of the 

 Nemertina found on the Pacific co 

 dorsal surface violet, tip of head bright 

 red, transverse bands and ventral sur- 

 face white, i, entire worm, reduced; 



2, anterior end extended, side view ; 



3, anterior end contracted. (From a 

 drawing furnished by Dr. \V. R Coe.) 



