, 
530 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
straight line. Dorsal outline from origin of dorsal fin to caudal slightly 
sigmoid, the portion under base of second dorsal nearly straight, while 
the caudal peduncle widens at its extremity, is two and a half times as 
long as its least depth, and at its narrowest place one-third as deep as 
the greatest depth of the fish. Abdominal outline slightly curved. 
Snout twice as long as longitudinal diameter of eye, which is con- 
tained about four and a half times in the side of the head; interorbital 
width slightly less than longitudinal diameter of eye. 
Bones of head less conspicuously striated than usual in the genus. 
Preorbital, suborbital ring and stay, and operculum distinctly striated, 
the strive radiating; upper surface of head punctate, with short striz 
on the upper margins of the orbit and on the occiput. Top of head and 
interocular space almost flat, a serrated, crest-like ridge over each eye 
(hence the specificname). The interorbital space unusually broad, not at 
all concave, as broad as eye; a slight trace of a cross furrow behind the 
eye. Central ridge of operculum distinct, and continued backwards 
considerably beyond its membranous edge as a strong, sharp spine. 
A similar sharp spine on the angle of the preoperculum. A strong 
spine, smaller than those on the gill-covers, on the scapular bone, and 
a Similar one on the suprascapular region. A backward-directed pre- 
ocular spine. 
Mouth rather large, somewhat oblique, the maxillary extending to 
opposite front of eye; jaws nearly equal; entire upper edge of man- 
dible hidden by the preorbital when the mouth is closed; lower edge 
of preorbital set with small spines terminating the striz. Upper jaw 
two and one-sixth times in length of side of head. 
A band of several rows of villiform teeth along both jaws; tip of the 
upper jaw emarginate and toothless; villiform teeth on palatines and 
vomer. Tongue thick and fleshy. Eye lateral, almost circular; inter- 
orbital area flat transversely. 
Gill-openings continuous, the membrane not joined to the isthmus; 
branchiostegals seven. Gill-rakers long and SUSU about three- 
fourths as long as the diameter of the orbit. 
First dorsal arising a little anterior to the tip of the operculum ; 
the third and longest spine nearly equal to half the length of the head, 
the ninth and tenth spines very short, nearly hidden in the skin. 
First and second dorsal spines serrated anteriorly. Second dorsal with 
a nearly straight upper margin, but slightly highest in front; rays all 
once bifureate. Anal commencing and ending slightly posterior to the 
origin and termination of the second dorsal; rays all once bifureate. 
Posterior margin of caudal slightly concave when expanded; all the 
long rays except the two outer ones branched, the four central ones 
three times bifurcate. 
Pectoral pear-shaped when expanded; the membrane between the 
rays very wide; all the rays bifurcate except the uppermost and lower- 
inost; the tip of the fin reaching to the eighth or ninth anal ray when 
