58 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii9 



very short labial furrow present at corner of lower jaw in larger speci- 

 mens, not noticeable in smaller specimens. 



Origin of first dorsal fin slightly posterior to axil of pectoral fin, 

 a perpendicular line drawn ventrally from origin intersecting anterior 

 third of pectoral fin; base of first dorsal fin one-third to one-half 

 length of head and about twice length of pectoral fin base; anterior 

 margin of first dorsal fin broadly and evenly curved, particularly 

 in larger individuals; distal margin of first dorsal fin rather deeply 

 falcate, particularly on lower two-thirds of fin; lobe of first dorsal 

 fin from two-fifths to one-half length of first dorsal base; origin of 

 second dorsal fin situated about two-fifths of way back above base 

 of anal fin; second dorsal fin tall, its greatest height about three- 

 fourths length of base and from three-fourths to four-fifths of greatest 

 height of anal fin; second dorsal fin base from one-half to five-eighths 

 of anal fin base; lobe of second dorsal fin rather long, its length about 

 a third again greatest height of fin and extending from two-thirds 

 to three-fourths of distance from posterior part of second dorsal 

 base to upper precaudal pit; pectoral fin from two-fifths to two-thirds 

 length of head (higher values usually apply to larger individuals) ; 

 pectoral fin two-thirds as broad as long; length of pectoral fin base 

 from five-eighths to thi'ee-fourths length of anal fin base; inner two- 

 thirds of anterior margin of pectoral fin straight, outer third slightly 

 convex; distal margin of pectoral fin slightly falcate; apex of pectoral 

 broadly pointed in small specimens, slightly more acute in larger 

 individuals; inner corner of pectoral narrowly rounded; length of 

 pelvic fin from two-thirds to four-fifths length of anal fin; length 

 of pelvic fin base from five-ninths to three-fourths length of anal 

 fin base; anterior margin of pelvic fin straight or slightly convex; 

 distal margin of pelvic very slightly falcate; anal fin from one-tenth 

 to one-third again as long as pelvic fin; length of anal fin base one- 

 fourth to four-ninths again as long as pectoral and pelvic fin bases 

 and from three-fifths again to nearly twice as long as second dorsal 

 fin base; height of anal fin one-fifth to one-fourth greater than height 

 of second dorsal fin; length of caudal fin from one-fourth to nearly 

 one- third of total body length; upper margin of caudal fin evenly 

 convex; terminal part of caudal slightly less than one-fourth of total 

 length of fin; lower posterior margin of terminal part of caudal fin 

 nearly straight or slightly falcate; both terminal and lower apices 

 of caudal broadly pointed; lower lobe of caudal appearing relatively 

 narrow and long, particularly in larger individuals, the distance from 

 the angle included by the upper and lower caudal lobes to tip of latter 

 going about 1% times in anterior margin of lower caudal lobe; lower 

 caudal lobe about one-third as long as upper lobe; lower caudal lobe 

 rather erect, sloping posteriorly at about a 25 to 30° angle from a 



