74 THE VOYAGE OP H.M.S. CHALLENGER. 



profile of the head convex ; the gill-opening extends downwards to the level of the 

 middle of the root of the pectoral. The dorsal spine is inserted above the posterior third 

 of the eye, and scarcely half as long as the head, or as its distance from the second 

 dorsal fin ; it is armed with four series of very small barbs, the two front series being- 

 very close together. The anterior half of the dorsal and anal fins elevated somewhat 

 higher than the dorsal spine ; ventral spine fixed. Uniform l^rowuish-grey ; caudal 

 blackish, with the interradial membrane whitish and without any cross bands. 

 Length of specimen, 12 inches. Inland Soa, Japan. 



Monacanthus setifer, Benn., Market at Yokohama. 



