172 BULLETIN 3G, UNITED STATES NATIONAL MUSEUM. 



bly mottled with black, gray, aud brown. A similar light area in the 

 median line of the back behind the blow-hole and another on the tail, 

 near the insertion of the flukes; nnder side of fluke grayish. 



The light areas of the sides are sometimes indistinct, or absent. 



Teeth f^-, Vertebra?: C. 7, D. 15(-1G), L. 23(-24), Ca. 43(-45)=88 

 (-92\ Skull similar to that of L. aciitus. Rostrum short, broad, and 

 pointed; its breadth at the base two-thirds its length. Intermaxillas 

 broad and flat, their outer margin convex. Temporal fossa) moderate, 

 elliptical, not strongly directed upward. 



Measurements of the exterior. — ( 5, young. From Clark.) Total length, 

 G5J inches (1GG.4'"'); distance from extremity of snout to base of 

 dorsal fin, 30 inches (7G.2"'); vertical height of dorsal fin, G inches 

 (15.2""); length of pectoral fin, 12 inches (30.5™); breadth of flukes, 

 15 inches (38.1""). 



Measurements of the slcull. — (N. N. Mus. Sci. and Art, Edinburgh.) 

 Total lengtli,4G ""; length of rostrum, 22.9""; breadth of same at base, 

 15.2""; at its middle, 8.7""; breadth between otbits, 23.5""; length of tem- 

 poral fossa, 7.9 '". 



Ilahitat. — North Atlantic Ocean; Baltic Sea, Kiel {Claudius) ; North 

 Sea; Irisli Channel; Faroe Islands; Greenland {Beinhardt) -, Davis 

 Strait {Eschricht). 



LAGENORHYNCnUS OBLIQUIDENS Gill. 

 (Plate 27, iigs. 1 anil '2.) 



In form, and also probably in coloration, nearly identical with L. acu- 

 tus. "The animal is rather thick in proportion to its length; black 

 above, with a strongly falcate dorsal. Below, white, to the edge of the 

 patch passing from the lower lij) below the pectorals and terminating a 

 short distance behind the vent. A broad gray smouch on each side 

 above the line of the black color, and interrupted about the middle of 

 the animal on each side; the etlges of the gray are ill-defined. The 

 posterior edges of the pectorals and dorsal are also grayish." (Dall.) 



"Greenish black on the upper surface, lightened on the sides with 

 broad longitudinal stripes of white, gray, and dull black, which in most 

 examples run into each other, but below it is of a pearly or snowy 

 white. The posterior edge of the dorsal fin is tipped with dull white or 

 gray, and sometimes the flukes are marked in the same manner." 

 (Scammon.) 



Teeth ^ Vertebra^ : C. 7, D. 13, L. 24, Ca. 30=74. 



Skull similar in general appearance to that of X, aeufus, but somewhat 

 less broad in proportion to its length (the width between tlie orbits is 

 less than the length of the rostrum.) Premaxilla^ more or less rounded, 

 their outer margins not strongly sinuate. Temporal fossa? large and 

 rounded. Pterygoid bones not in contact in the median line, widely 



