DERBIO. 
141 
prostrate, and pointing forward. Two free spines a short 
distance before the anal fin. Dorsal and anal fins at first 
elevated, gradually becoming narrower, and ending opposite 
each other, not far from the tail, which is deeply forked; the 
lobes slender and pointed. Pectoral fins moderate; ventrals 
small, behind the root of the pectorals. Colour on the back 
decided blue, from which four bands stretch down the sides. 
The belly light yellow, with pink tints. Upper part of the 
origin of the dorsal and anal fins with a distinguished dark 
blotch. Iris of the eyes yellow. 
