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 doM-n 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. 



