Figs. 55-^0. — Barbels and tactile sense organs. (After Goodf: in U. S. F. C.) 

 55. Cusk, Ophidiut)i. 56. Drum-fish, Pogo7iias. 57. Sea-raven, Hemitripterus. 

 58. Catfish, Amiurus. 59. Spoon-bill sturgeon, Polyodon (ventral view of snout). 

 60. Sea-robin (Gurnard) , Prionotus. 



47 



