104 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
to say, however, to what extent the colours may have been altered by the spirit: 
some of the scales also may have been rubbed off. 
CHROMIS FACETUS. Jen. 
C. supra virescenti-niger, lateribus pallidioribus : dorso modice arcuato ; JSronte elevato, 
rostro summo ante oculos paululum excavato: limbo preoperculi poris quatuor con- 
spicuis impresso : squamis latis, marginibus liberis levissime ciliatis: spinis dor- 
salibus quindecim, analibus sex: pinnis ventralibus longe acuminatis, ad analem 
pertingentibus : pinnd caudali subequali. 
De 1atO> A: G85 (C. 16)"&ess PPi4e Vs: 
Lone. une. 5. lin. 9. 
Form.—Oblong-oval, very much compressed ; the back moderately elevated, and more curved than 
the abdomen. Greatest depth a little behind the insertion of the pectorals, and contained 
twice and three-quarters in the entire length: thickness about two-fifths of the depth. Fore- 
head high: profile falling very obliquely, and slightly hollowed out in front of the eyes; the 
upper and under profile meeting at the mouth at nearly a right angle. Head contained not 
quite four times in the entire length; its own length and height nearly equal. Mouth small, 
protractile: jaws about equal, the lower one, if anything, a little the longest: lips not very 
fleshy. Maxillary rather slender, retiring almost entirely, when the mouth is closed, beneath 
the sub-orbital, the anterior margin of which is slightly hollowed out, and somewhat sinuous. 
Teeth in card in both jaws, forming a narrow band; the outermost row longer and stronger 
than the others, especially the four or six middle ones in front, which are somewhat conical and 
slightly hooked. Pharyngean teeth present, but none on the vomeror palatines. Eyes rather 
small, their diameter about one-fifth the length of the head; high in the cheeks, and a little 
nearer to the snout than to the posterior margin of the opercle: the space between broad, 
equalling nearly two diameters and-a-half. Nostrils consisting of a single round orifice half-way 
between the eye and the end of the snout. Preopercle with the basal margin short, and 
forming a slightly obtuse angle with the ascending one, the margin of which is entire. Opercle 
of a triangular form, broad at top, but narrowing off towards the bottom. Subopercle and 
interopercle much developed; their outer margins, taken together, rounded off nearly in a 
semicircle. Branchial membrane quite free all round, unattached to the isthmus, and but 
slightly emarginate. Snout, suborbital, jaws, and limb of the preopercle, naked; but the 
cheeks and rest of the opercular pieces scaly: the scales on the subopercle large. Four large 
pores on the limb of the preopercle, preceded by three others beneath the lower jaw: similar 
pores beneath the eye, and extending partially round it; one on the crown of the head, and a 
few smaller ones scattered about the snout; a large one just above the opercle, and another 
higher up on each side of the nape. 
Scales on the body large; about twenty-five or twenty-six in a longitudinal row, and 
eleven or twelve in the depth; broader than long, with the free edges very minutely ciliated, 
the concealed portions with a fan of thirteen striw, and the basal margins with twelve distinct 
