Fishes of the Western North Atlantic 



267 



Second dorsal fin: vertical height 2.75 length of base 4.7. 



Anal fin: vertical height 3.45 length of base 5.0. 



Caudal fin: upper margin 30.2; lower anterior margin 12.6. 



Pectoral fin: outer margin 14.2; inner margin 5.4; distal margin 12.1. 



Distance from snout to: ist dorsal 26.2; 2nd dorsal 56.85 upper caudal 69.7; 



pectoral 19.85 pelvics 44.1 ; anal 57.5. 



Interspace between: ist and 2nd dorsals 23.O5 2nd dorsal and caudal 9.65 anal and 



caudal 7.3. 



Distance from origin to origin of: pectoral and pelvics 26.05 pelvics and anal 1 2.4. 



Figure 44. Galeocerdo cuvier, young male, 1,245 nim. long, from Newport, Rhode Island (Harv. Mus. Comp. 

 Zool., No. 35145). A Anterior part of head of same. B Cross section of upper part of trunk opposite origin of 

 pelvics showing mid-dorsal ridge. C Cross section of caudal peduncle to show lateral ridges. D General view 

 of dermal denticles, about 28 x; lateral and apical views, about 56 x. E Teeth of larger specimen (U.S. Nat. 

 Mus., No. 1 10900), about 0.2 natural size. F Third lower tooth, enlarged. G Fifth upper tooth of same, en- 

 larged. 



Trunk stoutest opposite ist dorsal and tapering evenly rearward, the midline of 

 back with a low dermal ridge extending rearward from a short way anterior to rear tip of 

 1st dorsal about % of distance to 2nd dorsal, where it gives place to a narrow, ill-defined 

 furrow that reaches to the latter.' Caudal peduncle slender, oval in cross-section, with a low 

 rounded ridge along each side at the midlevel, from opposite rear end of 2nd dorsal to a 

 little beyond origin of caudal. Precaudal pits in the form of obtusely subangular furrows, 

 the upper considerably the more distinct and larger. Dermal denticles large, variously 



7. The combination of ridge and furrow in this region appears to be unique. 



