168 BULLETIN :i;, UNITED STATES NATIONAL MUSEUM. 



symphysis keeled. Projection of maxilla inclosing the maxillary notch 

 externally rounded off. 



Measurements of the exterior (from Lesson). — Total length, 71.8 inches 

 (ISd.l*^'") ; length from extremity of snout to pectoral fin, 23.2 inches 

 (59.5'''") ; length of pectoral fin, 12.1 inches (31.1"") ; length of mouth, 

 lO.G inches (27.1"") ; breadth of flukes, 1G.9 inches (43.3""). 



Measurements of slcull. — (3029, E. Coll. Surg. Tasmania.) Total length, 

 41''"'; length of rostrum, 11.2""; breadth of rostrum at its base, 0.1'"' ; 

 at its middle, 3.0''"; length of temporal fossa, 0.9'"'; breadth between 

 hinder margins of temporal fossiie, 10*'"'. 



Habitat. — Seas about Cape Horn ; New Zealand ; New Gmnen {Quoy) • 

 Tasmania. 



TUKSIO I50REALIS (Peale). 



(Phito 22, figs. 1 and 2.) 



Form slender. Snout short, distinct. Flukes small. Lower jaw 

 longer than the upjier and curved upwards at the extremity. 



Color black, except in the following regions, where it is white: Ex- 

 tremity of lower jaw ] a large lozenge-shaped area between the pectoral 

 fins and a line extending thence to the flukes. Lower side of flukes 

 clouded with white. Eyes dark brown. 



Teeth, ^^. Skull like that of L. peronii, but the mandible more slen- 

 der and the symphysis of the same not keehd. The projection of the 

 maxilla which bounds the maxillary notch externally pointed. Super- 

 orbital iflate of maxilla and frontal bone very thin, llostrum tapering 

 distally to a sharp termination, its breadth at the middle somewhat less 

 than one-fourth its length. 



Measurements of the exterior. — (From Mr. Dall's MS. notes.) Total 

 length, 97 inches ('340.4"") ; distance from extremity of snout to pectoral 

 fin, 25 inches (03.5'"'); length of i)cctoral fin (along anterior margin), 12 

 inches (30.5""); breadth of flukes, 16 inches (40.0'^'"). 



Measurements of the sJiull. — (National Museum, 8100. Cape Mendo- 

 cino, Cal. 9.) Total length, 43.7""; length of rostrum, 24''"; breadth 

 of rostrum at its base, 11""; at its middle, 5.0''"; breadth between 

 orbits, 17.0' "' ; length of temporal fossa, 7.1"". 



Habitat. — North Pacific Ocean ; California {Bail) ; Japan [Hilgendorf). 



7. LAGENORHYNCHUS Gray. 



Eostrum large and broad. Eostral portion of intermaxilhe flat (some- 

 what convex in oMiqnidcns and electra). Pterygoid bones in contact or 

 separate. Symphysis of mandible short. Teeth variable in si/.e, 22-45. 

 Vertebrae, 73 to 92. 



Head with a short, plowshare-like beak (not distinctly marked off 

 from the forehead in ohsourus). Dorsal and i^ectoralfins moderate, fal- 

 cate. Caudal ridges very proniiiKuit. Sides with two areas of light 

 color sejiaratcd by irregular, oblique dark bands. 



