288 



Part III. — Thirteenth Annual Heport 



Fig. 11. Similar section through fore and mid-brain, and medulla oblongata of the 



same as tig. 10. Z. com p. oc. No 8 x apo. 16 mm. 

 Fig. 12. Oblique transverse section through fore- brain of a larva of twelve days. 



Z. comp. oc. No. 4 x apo. 8 mm. 

 Fig. 13. Similar section through same as fig. 12, but more posterior. Z. comp. oc. 



No. 4 x apo. 8 mm. 



Plate XII. 



Fig. 1. Transverse section through the mid-brain and the ventrally prolonged third 



ventricle of a larva of eighteen days. Z. com]), oc. No. 8 x apo. 16 mm. 

 Fig. 2. Similar section through same as preceding and immediately posterior to 



it. Z. comp. oc. No 8 x apo 16 mm. 

 Fig. 3. Similar section through same as preceding cutting the medulla oblongata 



and infundibulum. Z. comp. oc. No. 8. x apo. 16 mm. 

 Fig. 4. Similar section through same as preceding and immediately posterior to it. 



Z. comp. oc. No 8. x apo, 16 mm. 

 Fig. 5. Vertical longitudinal section through mid and hind-brain,to one side of 



middle line of a post-larval form of 5 mm. Z. comp. oc. No. 4 x apo. 



8 mm. 



Fig. 6. Similar sections through same as fig. 6., but more lateral. Z. comp. oc. 

 No. 4. x apo. 8 mm. 



Fig. 7. Similar section through same as figs. 5 & 6, but cutting the fore, mid, and 



hind-brain almost in the middle line. Z. comp. oc. No. 4 x apo. 8 mm. 

 Fig. 8. Similar section near the middle line of the same as the preceding. 



Z. comp, oc. No. 4 x apo. 8 mm. 

 Fig. 9. Similar section through the same as the preceding, but more lateral. 



Z. comp. oc. No. 4xapo. 8 mm. 

 Fig. 10. Transverse section through the mid and fore-brain and olfactory organs of a 



post-larval form of 5 m.m. Z. comp. oc. No. 4 x apo. 8 mm. 

 Fig. 11. Similar section through same as preceding, but slightly posterior to it. 



Z. comp. oc. No. 4 x apo. 8 mm. 



Tlate XIII. 



Fig. 1. Transverse section through hinder end of optic lobes of post-larval form of 



5 m.m. Z. comp. oc. No. 4 x apo. 8 mm. 

 Fig. 2. Similar section through same as preceding, but slightly posterior to it. 



Z. comp. oc. No. 4 x apo. 8 mm. 

 Fig. 3. Similar section through same as preceding, cutting the medulla oblongata 



and second pair of nerves. Z. comp. oc. No. 4 x apo. 8 mm. 

 Fig. 4. Transverse section through anterior of fore- brain and olfactory organ of a 



post-larval form of 12 m.m. Z. comp. oc. No. 4 x apo. 16 mm. 

 Fig. 5. Similar section through fore-brain and second pair of nerves, of the same as 



preceding. Z. comp. oc. No. 4x;ipo. 1(> mm. 

 Fig. 6. Similar section through optic lobes and ii:.umlibulum of the same as 



preceding. Z. comp. oc. No. 4 x apo. 16 mm. 

 Fig. 7. Similar section through optic lobes and cerebellum, of the same as preced- 

 ing. Z. comp. oc. No. 4 x apo. 16 mm. 

 Fig, 8. Similar section through posterior of optic lobes, and cerebellum of the same 



as preceding. Z. comp. oc. No. 4 x apo. 16 mm. 

 Fig. 9. Similar section through cerebellum and medulla oblongata of the same as 



preceding. Z. comp. oc. No. 4 x apo. 16 mm. 

 Fig. 10. Similar section through fourth ventricle, and medulla oblongata of the 



same as preceding. Z. comp. oc. No. 4 x apo. 16 mm. 

 Fig. 11. Transverse section through mid and fore-brain of a larva of eighteen days. 



Z. comp. oc. No. 8 x apo. 16 mm. 

 Fig. 12. Similar section through the same as preceding, but somewhat posterior to 



it. Z. comp. oc No. 8 x apo. 16 mm. 



