The Exterior of the Fish 



7 



Fig. 7.— Porcupine-fish, Diodon hysirix (Linnaeus). Tortugas Islands. 



Fig. 8. Fic. 9. 



Fig. 8. — Thread-eel, Nemichthys avocetta Jordan and Gilbert. Vancouver Island 

 Fig. 9. — Sea-horse, Hippocampus hudsonius Dekay. Virginia. 



