158 BULLETIN 'Mi, UNITED .STATES NATIONAL MUSEUM. 



till, 17.3 inches i^44'"') ; lcii.utli of base of dorsal liii, 7.9 inches ^20"^'"); 

 liei^lit of dorsal liu, 6.3 inches (10*='") ; length of pectoral fin, 11 inches 



(liS'-). 



MemuremenU of the skull. — (Berlin Museum. Type, 9 ) : Total length, 

 49.9"" ; length of rostrum, 29.3<'"' ; breadth of rostrum at its base, 

 11.1""; at its middle, 5.8'^'"; breadth of intermaxilhe at same point, 

 3.7""; breadth between orbits, 20.4""; length of temporal fossa, 11^'". 



mdntat.—Sonih Atlantic Ocean, 32° 29' 1" S. hit., 2^ 1' W. long. 

 {Peters.) 



3. TUESIOPS Gervais. 



Kostrum moderately long, tapering ; pterygoid bones normal, in con- 

 tact; symphysis of mandible short; jiostorbital process of frontal tri- 

 angular; teeth large, smooth, 22-26; vertebrae, 61 to 64. 



Beak moderate, tapering, distinctly marked off from the forehead ; 

 dorsal and pectoral tins falcate; color gray or greenish, lighter below; 

 sometimes with spots. 



TURSIOPS TUKSIO (Fabricius). 

 (PlateH, figs. 1 au(12.) 



General form stout. Forehead sloping; beak short and depressed; 

 lower Jaw usually longer than the upper jaw. Dorsal tin situated in the 

 middle of the length, high and falcate. Pectoral tins broad at the base, 

 obtusely rounded off at the tip, and not deeply emarginate behind. 



Back, dorsal, pectoral, and caudal fins, snout, and sometimes the tip 

 of the lower jaw and lower lip, clear, plumbeous gray, more or less 

 tinged with ])urple. The gray color becomes lighter on the sides, and 

 passes by insensible gradations into the pure white of the under sur- 

 faces. In some individuals all that portion of the body lying back of 

 the anus is gray; in others the body is bicolor as far as the flukes. 

 (Specimens have occasionally been captured which were entirely of a 

 gray color.) 



Teeth, |. Vertebm?: C. 7; D. 13; L. 17; Ca. 27=64, Skull massive, 

 nostrum rather broad, depressed ; its length slightly exceeding one- 

 half the total length of the skull. Intermaxilhe thick and swollen. 

 Vomer appearing in the center of the palate. Pterygoid bones broad 

 and obtusely keeled. Inferior surface of frontal not deeply concave 

 in front of the optic canal. Temporal foss;e large and elliptical in 

 outline. Inferior extremity of the parietal broad. Greatest diameter 

 of the condyle of the mandible contained two and a half times in the 

 greatest depth of the ramus. Teeth large. Second tinger longer than 

 the third. 



Measurements of the exterior. — S adult. (Flower.) Total length, 114 

 inches (290.7 ""); length of mouth, 12.5 inches (31.9'='"); tip of snout to 

 dorsal fin, 50 indies (127.5""); length of pectoral fin, 15.5inches(39.5<='"); 



