1. CH^TODON. 



19 



length. The upper profile descends abraptly from the origin of the 

 dorsal, and is rather concave above the orbit. The lower profile also 

 IS concave beneath the angle of the mouth. The snout i^ moderatelv 

 produced as long as the diameter of the eye or a,s the distance 

 between the orbits. The angle of the prajopereulum is nearly a 

 nght one, and its lower margin is slightly denticulated. The spines 

 ot the fins a_re rather strong; those of the dorsal increase in length 

 to the fourth, which is two-thirds of the length of the head; the 

 foUo^^^ng graduaUy become shorter, and the last is not quite the 

 length of the first ray. The soft portion is not elevated and rounded 

 posteriorly The caudal is tnmcated. The second anal spine is the 

 longest and strongest ; it equals the fourth of the dorsal The soft 

 portion of the anal is very much like the corresponrhng opposite fin, 

 but rather lower. ITie pectoral reaches to the vertical from the vent 

 the ventral to that from the anal. 



The scales are large, especially those between the spinous dorsal 

 and the lateral line. One of the largest covers two-thirds of the eye 



1 may add to the description of the colours given above, that the 

 ocular band appears rather lighter below the orbit; that each scale 

 ot the trunk, ^v^thln and without the brown band, has a silvery spot • 

 that the posterior band occupies all the soft dorsal, with the exception 

 ot a light edge and a fine brownish inframarginal line, whilst it does 

 not extend on to the anal. The coloure, however, have a Uttle faded. 



m . 1 , , inches, lines, 



lotal length >- q 



Height of the body 3 9 



Length of the head . l g 



Diameter of the eye 6 



Length of the fourth dorsal and of the second 



anal spine i ^ 



30. Chaetodon humeralis. 

 ^- 1|- ^-W ^- lat- 30. L. transv. 5/17. 



The snout is very sHghtly produced ; the lower prajopereular 

 margin denticulated ; the dorsal and anal fins rounded posteriorly 

 The ocular band is much narrower than the eye, and reaches over 

 the interoperciilum. A brown vertical band from the fii-st, second 

 and third dorsal spines to and below the base of the pectoral, touching 

 the opercular margin; another fi-om the tips of the last five dorsal 

 spines across the base of the soft dorsal and across the tail to the 

 middle of the base of the soft anal. The soft dorsal and anal white 

 with a broxTO mframarginal band ; caudal with a brown band at the 

 base, a brown crescent in the middle, and a white cross-streak behind 

 the crescent. 



Sandwich Islands. 

 a, b. Half-growTi. Sandwich Islands. 

 c, d. Adult. From the Haslar Collection. 

 e. Adult. From the Haslar Collection. 



