PISCES 169 
SOLENICHTHYES. 
Family MACRORHAMPHOSID Ai. 
CENTRISCOPS Gill, 1862. 
CENTRISCOPS HUMEROSUS Richardson. 
BELLOWS FIsH. 
Centriscus hwmerosus Richardson, Voy. Ereb. and Terr., 1846, 
Waso Ol xxxiy., es. 5, '6, 
Centriscops humerosus Gill, Proc. Acad. Nat. Sei. Phil., 1862. 
Dp. : 
Stations 18, 22, 29, 37, 51. 
eave y vile bos A 19): Vd: oe ees G..9) =, 12. 
Length of head 2.0, height of body, at ventral fin 2.4, length of 
caudal 5.0 in the total; diameter of eye 5.5, length of snout 1.5, 
interorbital space 7.3 in the length of the head. 
Head strongly compressed, a slight keel runs along the upper 
edge of the snout between the eyes and merges into the acute 
edge of the body; a strong horizontal ridge passes from the base 
of the snout on each side over the eyes, and backwards to the 
upper angle of the opercle, thence downwards towards the base 
of the pectoral, a similar ridge passes below the nostrils to the 
front edge of the eye thence forming its lower border; the snout 
is directed slightly upwards, and is roughened along its entire 
leneth; the nostrils are placed in a smooth area a little in 
advance of the eye and between the ridges above mentioned. 
The body is excessively compressed and elevated, the anterior 
profile is very steep and there is a more or less prominent hump 
above the opercle, thence it runs straight to the first dorsal spine ; 
the descent to the caudal peduncle is much steeper; the lower 
profile forms the even segment of a circle, drawn from a point 
on the dorsal edge, midway between the hinder edge of the eye 
and the first ray of the soft dorsal; forward of the anal fin the 
edge is acute and knife-like, and has five scutes in advance of 
the ventral fin, the hinder ones terminating in a spine. A ridge 
runs on each side of the median one and opposite to the ventral 
fin becomes spine-bearing; there are two median plates between 
the ventral and anal, each with a cluster of jagged spines. 
Fins—The first spine of the dorsal is very short and claw- 
like, the long second spine is equal to the length of the snout 
less the diameter of the eye, it is triangular in section and 
multi-grooved, each posterior angle being set with ten long 
