ON DINOPHILUS GIGAS. 121 



Fig. 7. The muscular bulb of the pharynx, in transverse section. 

 Eig. 8. Section through the middle of the trunk. 

 Fig. 9. Section through junction of stomach and intestine. 

 Fig. 10. Section of ventral ectoderm. Zeiss's im., oc. 2. 

 Figs. 11 — 16. — Diagrams of various forms of pharyngeal apparatus, as 

 seen in longitudinal sections of the head. 

 Fig. 11. Dinophilus (original). 

 Fig. 12. Polygordius (schematised from Uhljanin). 

 Fig. 13. Histriobdella (schematised from Foettinger). 

 Fig. 14. Terebella larva (schematised from Saleusky). 

 Fig. 15. Navis (schematised from Vejdovsky). 

 Fig. 16. Vortex (schematised from von Graff). 



VOL. XXVII, PART 1. NEW SEU. 



