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 Avhich four bands stretch clown 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. 



