148 



Memoir Sears Foundation for Marine Research 



Snout length: to angle of jaw, in straight line 1 6. i. 



Eye: horizontal diameter i.O. 



Gill opening lengths: ist 25.75 2nd 23. i; 3rd 20.0; 4th 17.1; 5th 14.6. 



First dorsal fin: height 9.8 ; length of base 9.8. 



Caudal fin: upper margin 22.3; lower anterior margin 13.9. 



Pectoral fin: length 17.6. 



Distance from snout to: ist dorsal 36.3; 2nd dorsal 65.3; upper caudal 77.6; 



pectoral 27.7; pelvics 55.6. 



Distance from origin to origin of: ist and 2nd dorsals 29.1 ; 2nd dorsal and caudal 



13.0; pectoral and pelvics 28.5; pectoral and anal 45.O. 



Trunk fusiform, stoutest from shoulders to ist dorsal, tapering rearward to moder- 

 ately stout caudal peduncle, the latter somewhat flattened dorso-ventrally, with strongly 

 developed lateral keel on either side originating opposite the tip of anal and extending 

 well out on caudal fin. Well developed precaudal pits both above and below, in the form of 

 lunate furrows. Dermal denticles small, but of various sizes, in patches or stripes with 



Figure 23. Cetorhinus maximus. Drawing based on adult female, 26 feet 6 inches long, mounted in New 

 England Mus. Nat. Hist., and on other available information. A, B Head of 12-foot specimen from Fire 

 Island, New York (Amer. Mus. Nat. Hist.). C Sector of upper jaw of same, about 1.4 x. Z) Lateral view of 

 two teeth, about 4 x. £ Dermal denticles from back, above origins of pectorals, about 8 x. F Left-hand nostril, 

 about natural size. 



