624 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Cyttomimus stelgis, new species. Plate 80, Fig. 2. 
Type, a female, 91 mm. long, from Albatross station 4122, near Barbers Point, south shore of 
Oahu, depth 192 to 352 fathoms; type, No. 51622, U. S. Nat. Mus. 
Length of head 42 hundredths of total length without caudal; diameter of eye 19; interorbital 
width 15; length of snout 15; length of maxillary 24; greatest depth 53; least depth of caudal peduncle 
7; length of second (longest) dorsal spine 17.5; length of pectoral 13. D. vm, 23; A. n, 24. P. 14 (in 
both fins). V. i, 6. Pores in lateral line 53 to 56; branchiostegals 7. 
Body rhombiform, compressed, deepest below first dorsal spine, the occiput and interorbital space 
depressed and flattened; thoracic region wide and flat, without scutes or enlarged scales; base of dorsal 
and anal fins convex in profile, their outlines rapidly converging to the very slender caudal peduncle, 
the ventral curve greater than the dorsal; greatest depth of body slightly greater than J length to base 
of caudal; least depth of caudal peduncle | diameter of eye; head very large, eye large, mouth oblique, 
with wide cleft, very protractile; interorbital region deeply excavated to receive the long premaxillary 
processes, which terminate above middle of pupil; distance from tip of snout to end of maxillary equal 
to length of snout and half eye; maxillary bone deeply grooved longitudinally, its distal end very 
obliquely truncate and emarginate; a wide fold of integument, reflected backward from upper lip, 
extends well under the projecting preorbital, conceals the exposed portion of premaxillary spines, and 
covers all but the posterior ridge of maxillary bone; teeth minute, broadly conical or triangular, present 
in very narrow bands (having the width of about 3 teeth) in jaws' and on vomer and palatine bones; 
premaxillary band ceasing at a point two-thirds the distance from tip of snout to end of maxillary; pre- 
orbital wide, covering a portion of the premaxillary, the margin undulated, the surface marked with 
fine diverging ridges, which eixdatthe anterior margin in minute spinelets; the bone is excavated to 
receive 3 wide diverging canals; other bones of suborbital ring are also furnished at margin with a 
series of minute spines; mandible deeply grooved, the marginal ridges roughened for a portion of 
their length, each terminating in a strong short spine at posterior end of bone; preopercle deeply 
grooved, its lower limb and angle minutely serrulate on both the ridges bounding the groove; inter- 
opercle similarly with 2 spinous ridges; opercle with a vertical spinous ridge parallel with its anterior 
margin, but otherwise without striae or spines; interorbital space broad and flat, its width equal to 
length of snout, one-third length of head, its inedian portion soft and membranous; supraorbital rim a 
heavy, bony process, longitudinally grooved, the bounding ridges of groove rough-granular; the outer 
ridge is continuous with the posterior orbital margin, the inner ridge extending backward to base of 
occiput, where it forks to form 4 short, widely diverging branches, covering occipital region; all these 
ridges rough-granular; branchiostegal membranes widely united to form a free fold across the isthmus, 
with which they are not united; branchiostegal rays 7 in number; gill-laminae narrow, inner gill-arch 
with a single series of filaments; gill-rakers short broad plates with roughened margins, 8 in number 
on horizontal limb of anterior arch; pseudobranchiae large. 
Pectorals very small, inserted just below a horizontal line from lower edge of pupil, their longest 
rays equaling length of ventral spine; soft rays of ventral fins slightly longer than pectoral, and barely 
reaching first anal spine. Insertion of ventrals vertically below pectorals; pectoral rays like those of 
dorsal and anal fins, expanded and flattened at tip, obliquely articulated, all simple, unbranched; rays of 
ventral and caudal fins profusely forked; first dorsal composed of 8 spines, of which the second is much 
the longest and much the strongest, over twice the height of the first spine; from the second, the spines 
decrease regularly in length and thickness, giving a steeply rounded profile to the fin, the eighth not 
spine-like in appearance, resembling the rays of the second dorsal, but stiffer and not articulated; all the 
dorsal spines longitudinally grooved or fluted; rays of second dorsal increasing in length from the 
first backward to beginning of posterior third, the last rays shortened, but longer than the anterior 
rays; anal fin similar to soft dorsal, but beginning and ending more posteriorly; anal spines 2 in 
number, short, strong, curved, the first longer than the second, the 2 spines joined by membrane, the 
second spine connected by low membrane to the first soft ray; caudal with the posterior margin gently' 
convex. 
Body completely scaled, except a narrow strip along bases of dorsal and anal fins; cheeks scaled, 
head otherwise naked; scales everywhere higher than long, the exposed portions vertically linear, of 
cycloid type, having entire edges and concentric striae, but the exposed surface rendered very rough 
by numberless minute prickles, mostly arranged in vertical cross-series on each scale; the roughest scales 
