PLATE VIII. 



Page 

 Fig. 1. BOTRYLLUS 454 



Fig. 2. AMAROUCIUM. a. A single individual removed 



from its cell and magnified 455 



Tig. 3. PYROSOMA 459 



Fig. 4. ASCIDIA 445 



Fig. 5. ASCIDIA INTESTINALIS 452 



Fig. 6. SALP^;. a. Solitary individual, b. A chain 

 of aggregated Salpae. c. Chain of embryo 

 Salpse derived from a 461 



Fig. 7. PHOLAS DACTYLUS 486 



Fig. 8. SOLEN SILIQUA 480 



Fig. 9. PECTEN 466 



Fig. 10. APLYSIA 497 



Fig. 11. BUCCTNUM 500 



Fig. 12. PURPURA 500 



Fig. 13. CHITON 505 



Fig. 14. EOLIS 509 



Fig. 15. DORIS 506 



Fig. 16. EGGS OF CUTTLE-FISH 504 



Fig. 17. AMPHIOXUS 514 



Fig. 18. ECHENEIS REMORA 514 



Fig. 19. SYNGNATHUS . . . . : 519 



Fig. 20. SYNGNATHTJS HIPPOCAMPUS 519 



