PLATE III. 



Figs. 11, 12. Echiurus unicinctus, von Drasche. 



Fif. 1 1. The large terminal funnels from the anal vesicles ; x 900. The pointed flagellate 

 cells of the funnel margin are figured from a fresh specimen of Echiurus 

 pallasii. 



a. The flagellate cells forming the rim of the 



funnel. 

 p. Nuclei of the peritoneum. 

 i. The internal wall of the funnel. 



k. Communication between the canal of the funnel 

 and the lumen of the anal vesicle. 



m. Branched contractile cells occupying the inter- 

 space between the inner and outer walls of 

 the funnel. 



Fisr. 12. A smaller lateral funnel. Letters as in fig. 11. 



o 



Fig. 13. Thalassema faex, n. sp. 

 Fig. 13. One of the two anal vesicles ; magnified 8 times. 



r. Opening into the cloaca. 



Figs. 14-16. Phascolosoma pudicum, n. sp. 

 Fig. 14. Hooks of the proboscis arranged in a ring ; x 140. 

 Figs. 15, 16. Papillae from the surface of the body ; x 350. 



Fig. 17. Phascolosoma flagriferum, n. sp. 



Fig. 17. The animal drawn natural size. 

 a. Anus. 



