PLATE II. 



Fig. 7. Longitudinal section tlivougli endostylo. 'iUO/l. 



Fig. 8- Longitudinal section througli thorax. 40/1. 



Fig. 9. Longitudinal section tliroiigh the wall of branchial siphon. 200/1. 



Fig. 10. Longitudinal section through dorsal tubercle. 200/1. 



Fig. 11. Cross-section through dorsal tubercle. 200/1. 



Fig. 12. Part of branchial sac. 200/1. 



Fig. 13. Cross-section of longitudinal vessels. 200/1. 



Fig. 14. Cross-section of endostyle. 200/1. 



