40 
W. J. Dakin 
Fig. 13. Three ganglion cells from the visceral ganglion of P. maximus. (Maceration 
preparation in Vs alcohol). x 250. 
Fig. 14. Ganglion cell in section of the visceral ganglion of P. maximus, illustrating 
Nissl's granules. Stain. modified Nissl. x 500. 
Plate 2. 
Fig. 15. Section of visceral ganglia and surrounding tissues of Mactra stuliorum, the 
section being taken in the plane of the gangha. x 20. 
Fig. 16. Visceral gangha and nerves of Area Noae, showing osphradial nerves (recon- 
structed from sections). x 15. 
Fig. 17. Sagittal section through visceral ganghon of Pedunculus filosus near base of 
branchial nerve, x 44. 
Fig. 18. Visceral ganghon of Pinna ndhilis. x 5. 
Fig. 19. Visceral ganghon of Yenm casina, from sections. x 15. 
Fig. 20. Visceral gangha of Spisula solida, from sections. x 12. 
Fig. 21. Sagittal section through visceral ganghon and osphradium of Spisula solida. 
X 50. 
Fig. 22. Sagittal section through visceral ganghon and osphradium ofM?/a^mwm^a. x 50. 
Fig. 23. Sagittal section through visceral ganghon of Ensis ensis. x 70. 
Fig. 24. Visceral gangha of Cardium edule (from sections). x 9. 
Fig. 25. Osphradium of Pholas dactylus (longitudinal section) fixed Bouin's fluid, stained 
Methyl-blue eosin. x 600. 
