128 MONACANTHÜS. 



isolated, simple, small filaments are on the head, the body, 

 the tail, the ventral flap and the dorsal spine. 



The colour is in spirits light-brown with small bauds and 

 lines : three silvery bands, the first from the eye downwards, 

 the second from the eye curved down- and backwards and 

 ending on the ventral flap behind the spine, the third from the 

 gill-opening going before the pectoral fin down- and back- 

 wards and ending behind the second silvery band; there is also 

 a very short one under the chin between the first silvery 

 band and the spine; the other bands are light-blue, one 

 from the posterior border of the eye curved back- and down- 

 wards and ending at the fourth ray of the anal fin,. a narrower 

 one before this from behind the pectoral fin to the anal fin ; 

 one band from the posterior border of the eye curved back- 

 and upwards and ending at the second and third dorsal ray; 

 one very narrow band from the upper border of the eye 

 going back- then upwards to the second dorsal fin, two bands 

 radiating from the anterior upper border of the eye over the 

 head, one before the dorsal spine, the other between the snout 

 and the dorsal spine; two bands from the anterior border ot 

 the eye, one of these forwards to the snout, the other obliquely 

 under the snout ; one band goiug from the dorsal fin to the 

 dorsal spine and from this forwards to the end of the snout; 

 over the hind part of the body are four cross-bands and one 

 on the tail ; the lines are between the 

 blue bauds and alternate with them; 

 the second dorsal and the anal fin are 

 colourless, the dorsal and ventral spine 

 are light-brown, the caudal fin has 

 light-brown spots. 



D 1 — 29, A 27, Pll, C 1/10/1. Length nearly 28 mM. 

 Its next relation is Monacanthus tomentosus L. It differs 

 in the scales, which in M. tomentosus have 4 or 5 spines on 

 the margin, in the coloration which is quite different and in 

 the gill-opening, which in M. tomentosus is placed somewhat 

 more anteriorly. 



Notes from tlie Leyclen Museum, "Vol. XXII. 



