Fishes of the Western North Atlantic 205 



Ilha Rasa near Rio de Janeiro, Brazil, in 80 meters, the type of S. haeckelii (Ribeiro), 

 1907 (Mus. Nac. Rio de Janeiro, No. 494). 



Distinctive Characters. Separable from 5. retifer by its obtusely rounded snout and 

 color pattern, and from S. torrei, which it closely resembles, by its relatively longer caudal 

 fin and by its color (see Key, p. 204). 



Description. Proportional dimensions in per cent of total length. Male, 151 mm., 

 from Barbados (Harv. Mus. Comp. Zool., type. No. 1335). Male, 316 mm., from Brazil 

 (Mus. Nac. Rio de J., type of S. haeckelii, No. 494). 



Trunk at origin of -pectoral: breadth 10.6, i i.i ; height 7.3, 8.9. 



Snout length in front of: outer nostrils 3.3, j mouth 4.0, 5.1. 



Eye: horizontal diameter 3.3, 3.5. 



Mouth: breadth 6.3, 6.3; height 2.6, 3.8. 



Nostrils: distance between inner ends 2.5, 2.2. 



Labial furrow length: lower 1.7, 1.3. 



Gill opening lengths: ist 2.0, 1.6} 2nd 1.5, j 3rd 1.5, ; 4th 1.5, } 



5th I.I, 1.2. 



First dorsal fin: vertical height 4.6, 5.4; length of base 6.0, 6.3. 



Second dorsal fin: vertical height 3.3, 3.2 ; length of base 4.3, 5. i. 



Anal fin: vertical height 3.3, 3.2; length of base 9.4, 9.2. 



Caudal fin: upper margin 26.8, 23.4; lower anterior margin 9.0, 8.5. 



Pectoral fin: outer margin 10.2, 14.2 j inner margin 6.3, 6.3} distal margin 8.0, 9.8. 



Distance from snout to: ist dorsal 43. 8, 48.4; 2nd dorsal 59.7, 67.15 upper caudal 



73.2, 76.6} pectoral 17.2, 18.75 pelvics 37.9, 39.25 anal 53.0, 60.1. 



Interspace between: ist and 2nd dorsals lO.O, 12.0 5 2nd dorsal and caudal 8.0, 



6.O5 anal and caudal 10.6, 9.2. 



Distance from origin to origin of: pectoral and pelvics 23.6, 20.9 5 pelvics and anal 



15-3, I9-7- 



Trunk slender, much compressed laterally rearward from pelvics. Dermal denticles 

 rather loosely spaced, much longer than broad, with 3-5 ridges and tridentate margins, 

 the median tooth considerably the largest, their blades erected at an angle of about 40° 

 over trunk as a whole, giving a very rough effect. 



Head convex in dorsal profile but flattened below. Snout broadly rounded, its length 

 in front of mouth between Vs and ^4 of length of head. Eye narrow, oval, its horizontal 

 diameter nearly as long as snout in front of mouth, the fold below eye well marked when 

 eye is open but hardly distinguishable when it is closed. Spiracle round, very small, pos- 

 terior to rear corner of eye by a distance about 0.2 times as great as horizontal diameter of 

 latter. Gill openings moderately concave in outline anteriorly, the ist slightly the longest, 

 about V2 as long as horizontal diameter of eye, the 5th slightly the shortest, the interspaces 

 between them decreasing in breadth rearward, the interspace between 3rd and 4th over 

 origin of pectoral. Nostrils slightly oblique, entirely distinct from mouth and widely sepa- 



