36 F. G. HEATHCOTE. 



Fig. 10. — Longitudinal section through a segment of the heart, art. 

 Artery, ost. Osteum. 



Fig. 11. — Transverse section through heart, exi. cut. External cuticle. 

 ext. 10. ht. External wall of heart, int. Internal lining of heart, m. w. hi. 

 Muscular wall of heart, muse. Muscle-fibres from the heart to the fat- 

 bodies, forming a sort of pericardium, susp. muse. Suspensory muscle of the 

 heart. 



Fig. 12. — Section through the nerve-cord. gnc. Ganglionic part. fnc. 

 Fibrous part. 



Fig. 13. — Section through region of eye, showing two eye-spots and the 

 lens of another, r. c. Retinal cells, inner pgt. Pigment round the base of 

 the crystalline cones. /. Lens. h. c. Cells of the hypodermis. pgt. Pigment 

 around the base of the retinal cells. 



Fig. 14. — Section through the region of the eyes, showing one spot cut 

 horizontally and one longitudinally. A. An eye-spot cut longitudinally. B. 

 An eye-spot cut transversely. /. Lens. pgt. Pigment, c. Crystalline cones. 



