464 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Description. — Tbe greatest height of the body is contained 8^- times, 

 and its width just behind the pectorals 9 times, in total length. The great- 

 est circumference equals 3 times the height. The height at the ventrals 

 equals the width immediately behind the pectorals. The height at the 

 vent is contained lO.J times in total length, and the width at the same 

 place is contained 4i times in the length of the head. 



The head is depressed; its greatest width equals ^ of its length, which 

 is coutained 4^ times in total length. The distance from the tip of the 

 snout to the nape is nearly equal to the greatest width of the head, or 

 ^ of total length. The distance between the eyes equals ri of the dis- 

 tance from the snout to the nape. The nostrils are tubuhir, nearly as 

 far apart as the eyes, and slightly fartlier from the eyes than from each 

 other. The length of the upper jaw equals half the length of the head, 

 the maxilla extending to the vertical through the hind margin of the 

 orbit. The mandible is twice as long as the snout, and extends beyond 

 the vertical through the hind margin of the orbit. On the interiuaxil- 

 laries there is one full series of teeth, and in front of these a few smaller 

 teeth form an outer imperfect series. There is a naked space at the 

 symphysis, and the first tooth on each side of this is larger than all the 

 rest. There is one complete series on the mandible, and in front of it, 

 about the symphysis, are two irregvdar short series. A few teeth are in 

 a cluster on the head of the vomer. The palatines have a short single 

 series. All of the teeth are slender, slightly recurved, and a little w^orn 

 at the points. The di^^taiice from the snout to the orbit is twice tlie 

 length of the ventral, equals the length of the longest dorsal ray, and ^ 

 of the distance of the ventral from the snout. The long diameter of the 

 eye is contained 9 times in the length of the head. 



The distance from the tip of the snout to the beginning of the dorsal 

 is ^ of the total length. The length of the first dorsal ray is contained 

 5 times, and of the longest 3f times in the length of the head. 



The distance from the tip of the snout to the beginning of the anal is 

 slightly more than J of the total length; the vent is in the middle of the 

 total length, immediately behind the third cross-band and under the 21st 

 ray of the dorsal; the distance from the origin of the ventrals to the vent 

 equals twice the length of the pectoral. The first anal ray is contained 

 5f times in the length of the head, and the longest, 44^ times. 



The extended pectoral reaches the 10th ray of the dorsal; the dis- 

 tance of its base from the snout is contained 4^ times, and its length G§ 

 times in the total length. 



The distance of the ventral from the tip of the snout is 3 times the 

 distance from the snout to the orbit, and is contained 4-i times in the 

 total length. The length of the ventrals is contained Of times in the 

 length of the head, and twice in the distance from the tip of the snout 

 to the orbit; they extend to a vertical through the anterior margin of 

 the base of the pectoral. 



Eadial formula : B. VI; D. (including half of caudal) 85; A. (includ- 

 ing half of caudal) 67; P. 18; V. 3. 



