310 



SCOTT. [Vol. I. 



PLATE XI. 



Fig. 36. Hind-bi-ain of 17 days' embrjo ; sagittal section. 



Fig. 37. Ditto, 18 days' embryo; horizontal section. 



Fig. 38. Spinal cord, ganglia, and spinal nerves, 17 days' embryo; hori- 

 zontal section. 



Figs. 39-41. Cerebral nerves and ganglia of larva, 4.8 mm. in length; 

 sagittal section. 



Figs. 42, 43. Transverse sections through the posterior part of the head 

 of newly-hatched larvie (exact size unknown). 



Figs. 44-47. Spinal cord, vertebral column, and lateral nerves of Ammo- 

 ccetes, transverse section : Fig. 44, larva of 7 mm. ; Fig. 45, of 14 mm. ; Fig. 

 46, of 30 (.?) mm. ; Fig. 47, of full-grown Ammoccete. 



