Fhascoloftoma oki/iosecmum. 



rig. 34. — A pa]nlla from the posterior body end. Zeiss Oc. 2 and Obj. 



Innn. 7)2 • 

 Fig. 3~). — Papillfe from the introvert basis. 180 x . 

 Fig. .'>G. — A sac-hke respiratory organ on the skin. 65 x . 

 Fig. .'^7. — Basal part of the same. Zeiss Oc. 2 and Obj. 1mm. '/i-- 

 Fig. 38. — A specimen dissected. 



F/i ascolosoma owstoni. 



Fig. 39. — A papilla from the posterior body region. 180 x . 



F^'ig. 40, — A jiapilla from the introvert basis. 180 x . 



Fig. 41. — A papilla from the introvert. 180 x . 



F'ig. 42. — A hook from the introvert. 180 x . " 



F'ig. 43. — A specimen dissected. 



F'ig. 44. — Magnified surface-vit^w of the pecnliar reticular structure on the 

 inside of the body-wall. Zeiss Oc. 3 and Obj. a,_,. 



Fhascolion rectus. 



Fig. 4;"). — The whole worm-body. 2 x . 



Fig. 46. — Papillte from the middle |)arts of tiie introvert. 330 x . 

 Fig. 47. — Papillaî and chitinous thickenings of the skin at the introvert- 

 basis. 200 X. 

 F'ig. 48. — Pa])ill;\^ from the posterior end of body. .')30 x . 

 Fig. 49. — Specimen dissected. 



Flidscolion (irtijiciosus. 



Fig. :"30. — Gastropod shell containing the worm. 2 x . 



Fig. .")1. — Large papilUe seen from above. 200 x . 



Fig. r)2. — Small ])apilUe from the middle region of the intr.)vert. 330 x . 



