66o journal of Comparative Neurology and Psychology. 



Fig. 7. Part of a transverse section through the ventral lobes, showing the eleventh ventral com- 

 missure. Obj. AA, DC. 4, tube length 160 mm. cs, cellular sheath; jc, fibrous core; len, left oesophageal 

 nerve; ren, right oesophageal nerve; II, eleventh ventral commissure. 



Fig. 8. Part of a transverse section, two sections posterior to that shown in Fig. 7, showing some 

 of the central portion and the right root of the eleventh commissure. Obj. AA, oc. 4, tube length 160 mm. 



Fig. 9. Part of a transverse section, two sections posterior to that shown in Fig. 8. Obj. AA, oc. 

 4, tube length 160 mm. 12, twelfth ventral commissure; II, root of the eleventh ventral commissure. 



Fig. 10. Part of a transverse section, one section posterior to that shown in Fig. 9, showing parts 

 of three commissures. Obj. AA, oc. 4, tube length 160 mm. 11, eleventh ventral commissure; 12, 

 twelfth ventral commissure; 13, thirteenth vfentral commissure. 



Fig. II. Part of a transverse section, one section posterior to that shown in Fig. 10. Obj. AA, 

 oc. 4, tube length 160 mm. 



Fig. 12. Part of a transverse section, one section posterior to that shown in Fig. 11, showing the 

 broadest part of the thirteenth commissure, the left root of the twelfth, and the beginning of the four- 

 teenth commissure. Obj. AA, oc. 4, tube length 160 mm. 



Fig. 13. Part of a transverse section, one section posterior to that shown in Fig. 12, showing the 

 thin posterior part of the thirteenth commissure. Obj. A,\, oc. 4, tube length 160 mm. 13, thirteenth 

 ventral commissure, 14, fourteenth ventral commissure, re, root of the thirteenth commissure. 



