306 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



wide, with one or two series of rather large, thiu cycloid scales. These 

 scales perhaps covered the cheeks also in life. At present no other 

 scales are present on the head in the typical example. Lower jaw promi- 

 nent, projectiug in front, bnt included at the sides. Teeth in jaws only, 

 minute, sharp, closely and evenly set, much as in Icosteus cenigmaticus, 

 but rather larger and less numerous. 



Eyes large, lateral, longer than snout, their diameter contained about 

 4 times in the length of tlie head. Cheeks rather mde. Preojjercle 

 with a prominent crest, behind which are some radiating mucous cavi- 

 ties ; the bone with a broad, prolonged, flexible membranaceous edge, 

 covered with radiating striie, each of which ends in a slightly exserted 

 flexible point. Oi^ercle and subopercle rather large, extremely thin, and 

 each crossed by numerous conspicuous radiating stritC. 



Gill-openings wide, not sei^arated by an isthmus, the membranes not 

 connected. Pseudobranchia? present. Branchiostegals 7. Gill-rakers 

 long, slender, sharp, their length nearly three-fourths the diameter of 

 the eye. They are rather close-set and moderately stiff. Gills 4, a 

 slight slit behind the i^osterior gill. 



]Sro bony stay connecting suborbital and preopercle. 



Scales very small, apparently cycloid, soft and smooth to the touch, 

 covering the body evenly, but becoming smaller below. Lateral line 

 nearly straight, apparently continuous, but not conspicuous on the mid- 

 dle part of the body. It does not run up on the caudal fin. There are 

 on it no traces of the spinules, so conspicuous in Icosteus miiymaticus. 



Scales (too small to be accurately counted) in about 120 transverse 

 series. 



Dorsal tin long and low, beginning opposite a point nearly midway 

 between the vent and the base of the ventrals 5 the luimber of rays 39 

 to 40. All the rays are soft and articulated, and apparently all except 

 the first are branched. The first rays are very low, the fin gradually 

 rising posteriorly, the highest about one-third the length of the head. 

 The base of the fin is somewhat scaly. 



Anal fin entirely similar, but shorter, beginning slightly in front of 

 the middle of the body (without caudal), and ending just in front of the 

 last rays of the dorsal; its rays about 28. 



Caudal broad, fan-shaped, on a slender peduncle; the accessory rays 

 numerous and recurrent. The fin is broken, so that its outline cannot 

 be ascertained. 



Pectorals as in Icosteus, with the carpal bones slightly exserted, as if 

 X^edunculate, the base a little below the axis of the l>ody, the outline 

 rounded. The fin is short and small, its length less ihau that of the 

 head. 



Yentrals short and small, thoracic, ]>la(;ed a little behind pectorals, 

 with one obsolete spine and five soft rays, one of which is slightly fila- 

 mentous. The fin is about one-third the length of the head. 



Fin rays not beset with s])iuules, 



