IIEMARKABLE 8PECIES OF ECHIUROIDS. 



51) 



V'J-" 



IKI'- 



Pil'ih 

 ph... 



pr... 



r.m. 



r.v. 



scg. 

 s.g. 



S.1II. 



s.o. 



(yplilosolc-liku ridgi; in ics- 



o[)liaf;ii.s. 

 V vacuole-likc spucea. 



. .|)igtnen t-l)o(lies. sjt spcriDiitozi )ii. 



..pignient-lilvc luxlios in cutis. tJ trabccular layer. 



..pigment granules. /.s 



..pharynx. 



..peritoneum. 



..radial nmscles ol' ventral 



hooks. 

 ..ring vessel. 

 ..segmentel organs. 

 ..siphonal groove, 

 ..sperm-mass. 

 ..sensory organ. 



v.m. 

 v.n. 

 v.v. 



'W.C. 



,.vas deferens. 

 ..ventral mesentery, 

 .ventral nerve-cord. 

 ..ventral vessel. 

 ..Wanderin»; cells. 



w.iii wing-muscles of pharynx. 



Plate I. 



Fig. I. — Bonellia miyajimai (female). 2 x . 



Fig. 2. — Male of Bonellia viiyajimai. From a ))h()tugrai)li. IJ x . 



Fig. 3. — Thalasscma tœnioides. Drawn fnnii a small specimen in tlie 



living state. Nat. size. 

 Fig. 4. — Thalassema elegans. Anterior half of the body proper with the 



proboscis^ in tins living state. Nat. size. 



